Marine magnetics data collected by the U.S. Geological Survey in U.S. Atlantic Seaboard in 2014 (Geographic, WGS84, point shapefile 2014-011-FA

Identification_Information:

Citation:

Citation_Information:

Originator: U.S. Geological Survey
Publication_Date: 2017
Title:

Marine magnetics data collected by the U.S. Geological Survey in U.S. Atlantic Seaboard in 2014 (Geographic, WGS84, point shapefile 2014-011-FA_mag.shp)

Edition: 1.0
Geospatial_Data_Presentation_Form: vector digital data
Series_Information:

Series_Name: data release
Issue_Identification: DOI:F7V69HHS

Publication_Information:

Publication_Place: Woods Hole Coastal and Marine Science Center, Woods Hole, MA
Publisher: U.S. Geological Survey, Coastal and Marine Geology Program

Online_Linkage: https://doi.org/10.5066/F7V69HHS
Online_Linkage:

https://cmgds.marine.usgs.gov/data/field-activity-data/2014-011-FA/

Larger_Work_Citation:

Citation_Information:

Originator: Arsenault, M.A.
Originator: Miller, N.C.
Originator: Hutchinson, D.R.
Originator: Baldwin, W.E.
Originator: Moore, E.M.
Originator: Foster, D.S.
Originator: O'Brien, T.F.
Originator: Fortin, W.F.
Publication_Date: 2017
Title:

Geophysical data collected along the Atlantic continental slope and rise 2014, U.S. Geological Survey Field Activity 2014-011-FA, cruise MGL1407

Edition: 1.0
Series_Information:

Series_Name: data release
Issue_Identification: DOI:F7V69HHS

Publication_Information:

Publication_Place: Reston, VA
Publisher: U.S. Geological Survey

Other_Citation_Details:

Suggested Citation:

Arsenault, M.A., Miller, N.C., Hutchinson, D.R., Baldwin, W.E., Moore, E.M., Foster, D.S., O’Brien, T.F., and Fortin, W.F., 2017, Geophysical data collected along the Atlantic continental slope and rise 2014, U.S. Geological Survey Field Activity 2014-011-FA, cruise MGL1407: U.S. Geological Survey data release, https://doi.org/10.5066/F7V69HHS.

Online_Linkage: https://doi.org/10.5066/F7V69HHS
Online_Linkage:

https://cmgds.marine.usgs.gov/data/field-activity-data/2014-011-FA/

Description:

Abstract:

In summer 2014, the U.S. Geological Survey conducted a 21-day geophysical program in deep water along the Atlantic continental margin by using R/V Marcus G. Langseth (Field Activity Number 2014-011-FA). The purpose of the seismic program was to collect multichannel seismic reflection and refraction data to determine sediment thickness. These data enable the United States to delineate its Extended Continental Shelf (ECS) along the Atlantic margin. The same data can also be used to understand large submarine landslides and therefore assess their potential tsunami hazard for infrastructure and communities living along the eastern seaboard. Supporting geophysical data were collected as marine magnetic data, gravity data, 3.5-kilohertz shallow seismic reflections, multibeam echo sounder bathymetry, and multibeam backscatter.

The survey was conducted from water depths of approximately 1,500 meters to abyssal seafloor depths greater than 5,000 meters. Approximately 2,761 kilometers of multi-channel seismic data was collected along with 30 sonobuoy profiles.

This field program had two primary objectives: (1) to collect some of the data necessary to establish the outer limits of the U.S. Continental Shelf, or Extended Continental Shelf, as defined by Article 76 of the United Nations Convention of the Law of the Sea and (2) to study the sudden mass transport of sediments down the continental margin as submarine landslides that pose potential tsunamigenic hazards to the Atlantic and Caribbean coastal communities.

More information regarding the field activity can be found in the cruise report:

Purpose:

Marine magnetic data is used in conjunction with other geophysical data to map basement structure, and delineate magnetic structures. Magnetic data is useful in mapping structural trends, including intrusive features or faults that are often concealed under sedimentary cover. Magnetic survey data can be combined with previously collected magnetics data to produce total field contours, and support the identification of features within the seismic reflection data. This data was collected to support the seismic reflection data, and was collected as secondary/supporting data.

Supplemental_Information:

For more information on the field activity, see the field activity page https://cmgds.marine.usgs.gov/fan_info.php?fan=2014-011-FA

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 20140822
Ending_Date: 20140911

Currentness_Reference: ground condition

Status:

Progress: Complete
Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -76.085053
East_Bounding_Coordinate: -65.769170
North_Bounding_Coordinate: 39.630968
South_Bounding_Coordinate: 30.677010

Keywords:

Theme:

Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:ab63e159-5c53-49fb-8fcb-b3dced11d12c

Theme:

Theme_Keyword_Thesaurus: None
Theme_Keyword: U.S. Geological Survey
Theme_Keyword: USGS
Theme_Keyword: Coastal and Marine Geology Program
Theme_Keyword: CMGP
Theme_Keyword: Woods Hole Coastal and Marine Science Center
Theme_Keyword: WHCMSC
Theme_Keyword: Marine Geology
Theme_Keyword: field activity number 2014-011-FA
Theme_Keyword: marine magnetics
Theme_Keyword: megnetism
Theme_Keyword: Geometrics G-882
Theme_Keyword: point shapefile
Theme_Keyword: navigation
Theme_Keyword: R/V Marcus G. Langseth

Theme:

Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: oceans
Theme_Keyword: geoscientificInformation

Theme:

Theme_Keyword_Thesaurus: USGS Thesaurus
Theme_Keyword: magnetic field (earth)
Theme_Keyword: marine geophysics

Place:

Place_Keyword_Thesaurus: None
Place_Keyword: North America
Place_Keyword: United States
Place_Keyword: Atlantic Ocean
Place_Keyword: Hudson Canyon
Place_Keyword: Caryn Seamount

Access_Constraints: None
Use_Constraints:

Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey as the originator of the dataset.

Point_of_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Nathan C. Miller
Contact_Organization: U.S. Geological Survey

Contact_Position: Geologist
Contact_Address:

Address_Type: mailing and physical address
Address: 384 Woods Hole Road
City: Woods Hole
State_or_Province: Massachusetts
Postal_Code: 02543
Country: USA

Contact_Voice_Telephone: 508-548-8700 x 2293
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: ncmiller@usgs.gov

Browse_Graphic:

Browse_Graphic_File_Name:

https://cmgds.marine.usgs.gov/data/field-activity-data/2014-011-FA/data/geophysics/2014-011-FA_mag.jpg

Browse_Graphic_File_Description:

Image showing 1-minute averaged navigation data collected with marine magnetics data by the U.S. Geological Survey on the R/V Marcus G. Langseth, 2014

Browse_Graphic_File_Type: JPEG

Native_Data_Set_Environment:

Microsoft Windows 7 Enterprise Service Pack 1; Esri ArcCatalog 10.3

Cross_Reference:

Citation_Information:

Originator: S. Maus
Originator: T. Sazonova
Originator: K. Hemant
Originator: J.D. Fairhead
Originator: Dhananjay Ravat
Publication_Date: 2007
Title:

National Geophysical Data Center candidate for the World Digital Magnetic Anomaly Map

Edition: 1.0
Geospatial_Data_Presentation_Form: document
Series_Information:

Series_Name:

Geochemistry Geophysics Geosystems: An Electronic Journal of the Earth Sciences

Issue_Identification: v. 8, no. 6

Publication_Information:

Publication_Place: Washington, D.C.
Publisher: American Geophysical Union

Online_Linkage: http://geomag.org/info/Smaus/Doc/wdmam.pdf

Cross_Reference:

Citation_Information:

Originator: Geometrics, Inc.
Publication_Date: 2005
Title:

G-882 Cesium Marine Magnetometer 25919-OM REV. F Operation Manual

Edition: F
Geospatial_Data_Presentation_Form: document
Publication_Information:

Publication_Place: San Jose, CA
Publisher: Geometrics, Inc.

Online_Linkage:

http://www.geometrics.com/geometrics-products/geometrics-magnetometers/magnetometer-information-and-case-studies/

Cross_Reference:

Citation_Information:

Originator: Lamont-Doherty Earth Observatory
Publication_Date: 2014
Title: Rolling Deck to Repository (R2R)
Edition: 1.0
Geospatial_Data_Presentation_Form: document
Publication_Information:

Publication_Place: UNCLOS
Publisher: UNCLOS

Other_Citation_Details:

Standard data products listed on the Rolling Deck to Repository website include cruise level metadata with an expedition summary including cruise id, vessel, operator, project titles and funding awards, science party, ports, dates, survey targets, and trackline geometry. There is also quality-controlled shiptrack navigation, and scientific sampling event logs. Some post-processed geophysical trackline profiles (underway gravity, magnetics, bathymetry, etc), for vessels equipped with these instrument types; and hydrographic profiles (depth, temperature, salinity, etc from CTD).

Online_Linkage: http://www.rvdata.us/catalog/MGL1407

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report:

Daily shipboard processing was done to ensure quality control over the data. Daily data was downloaded and plotted, then assessed as an indicator of proper magnetometer function. These steps are further outlined in the process steps.

Logical_Consistency_Report:

Under normal data collection conditions, the magnetometer is deployed and remains deployed until the end of data collection. Magnetic data collection had interruptions and data gaps during the MGL1407 cruise, mostly because the magnetometer needed to be recovered during the deployment and recovery of seismic equipment, which happened multiple times on the cruise (initial deployment on Julian Day JD235, passage of hurricane Cristobal on Julian Day JD238, and a medevac on Julian Day JD241). The data coincide with all seismic lines, as well as additional tracks that include a test segment prior to the start of seismic acquisition (Julian Day JD234), and tracks laid out to avoid hurricane Cristobal.

Three calibration loops were conducted on August 28, 2014 (Julian day JD240) to test the consistency of magnetometer readings at the loop crossings. The loop pattern was started at 10:24 UTC and finished at 11:23 UTC, resulting in four points of crossing. During the daily review of the magnetometer data, noise was observed in the 1-minute smoothed data plots from JD 246 starting at approximately 21:00 UTC (JD 246.8). At 14:30 on JD 247 the G-882 was powered down and retrieved to check all connectors and cables. As the G-882 neared the boat, a large collection of seaweed was visible on the tow cable where it meets the G-882. The seaweed was cleared, and the G-882 was brought on deck. Upon opening the nose assembly, a white, granular precipitate was seen on the protective housing to the male/female 8-pin connector. The precipitate was cleared and the male and female connectors separated for inspection. The pins were cleaned with a wire brush, and some dialectic grease applied to the connection. The nose assembly was returned to its original state, with the G-882 set in the CG tow position and the unit was redeployed to 220 m behind the ship. During MGL1407, the magnetometer displayed low signal levels. These low signals may have been caused by the connector corrosion (north of latitude 36o) or sub-optimal sensor positioning relative to the Earth’s magnetic field vector. Many of these noisy and low sensor values coincide with the ship course of 230-240 degree azimuth. They can be noted at JD 246 04:00 and JD 248 02:30. On JD 254 when seismic data collection ended and the G-882 was brought on board for the last time, more white precipitate was on the outside of the connector housing.

Completeness_Report:

This dataset represents all of the data collected during the MGL1407 cruise. While data collection was periodically interrupted for weather and safety considerations, the data listed here is represents what was collected. For an overview of the data interruptions, please see the logical consistency report.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

Navigation was acquired using the R/V Marcus G. Langseth's Network Time Protocol (NTP) server which synchronizes to the ship’s GPS clock. The magnetometer was towed in the center of gravity configuration, 253 m behind the ship on the starboard side, so a 253 m layback was applied. The horizontal accuracy is assumed to be 10 meters.

Lineage:

Source_Information:

Source_Citation:

Citation_Information:

Originator: U.S. Geological Survey
Publication_Date: Unpublished Material
Title: Marine Magnetics Data

Type_of_Source_Media: online
Source_Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 20140822
Ending_Date: 20140911

Source_Currentness_Reference: ground condition

Source_Citation_Abbreviation: none
Source_Contribution: Shipboard marine magnetics data

Process_Step:

Process_Description:

The magnetometer was towed in the center of gravity position, 253 m behind the ship on the starboard side, without any additional weights added. When deployed, the tow cable is attached to a boom on the starboard side. The G-882 is equipped with a CM-221 counter module that converts the cesium Larmour signal (70 kHz to 350 kHz) into magnetic field strength in nanoteslas (nT). The G-882 is a cesium vapor magnetometer, with a sensitivity to <0.004 nT/ Hz root-mean-square, an accuracy of <3 nT, and an operating range of 20,000 to 100,000 nT. Situated at the tail of the tow-fish, the magnetometer sensor should be oriented so that the Earth’s magnetic field lines are centered in the sensor’s active zone. For MGL1407, the sensor was oriented in the vertical configuration which is optimal for mid-magnetic latitudes (magnetic inclination > 67.5 degrees).

Process_Date: 2014
Process_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Matthew A. Arsenault
Contact_Organization: U.S. Geological Survey

Contact_Position: Geologist
Contact_Address:

Address_Type: mailing and physical address
Address: 384 Woods Hole Road
City: Woods Hole
State_or_Province: Massachusetts
Postal_Code: 02543
Country: USA

Contact_Voice_Telephone: 508-548-8700 x2354
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: marsenault@usgs.gov

Process_Step:

Process_Description:

During the survey, magnetometer data were logged 10 samples per second and recorded into raw data files, containing the magnetometer measurements, a date and time stamp, and sensor status. The raw data files are text files containing the samples for a 24-hour period based on Julian Day (JD, UTC time). The data streams are combined with a time stamp from NTP server aboard Langseth, which synchronizes time from the ship’s Global Positioning Satellite (GPS) clock.

Process_Date: 2014
Process_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Matthew A. Arsenault
Contact_Organization: U.S. Geological Survey

Contact_Position: Geologist
Contact_Address:

Address_Type: mailing and physical address
Address: 384 Woods Hole Road
City: Woods Hole
State_or_Province: Massachusetts
Postal_Code: 02543
Country: USA

Contact_Voice_Telephone: 508-548-8700 x2354
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: marsenault@usgs.gov

Process_Step:

Process_Description:

Raw data were downloaded at the completion of each day of measurements and transferred to a Linux laptop that was specially set-up with C-shell scripts for field processing the data.

Process_Date: 2014
Process_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Matthew A. Arsenault
Contact_Organization: U.S. Geological Survey

Contact_Position: Geologist
Contact_Address:

Address_Type: mailing and physical address
Address: 384 Woods Hole Road
City: Woods Hole
State_or_Province: Massachusetts
Postal_Code: 02543
Country: USA

Contact_Voice_Telephone: 508-548-8700 x2354
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: marsenault@usgs.gov

Process_Step:

Process_Description:

A series of C-shell scripts, written by Daniel Scheirer of the USGS (Menlo Park) were used to process the data: run_anverage_mag01: to create 1 minute averages of Langseth magnetics data. Magnetics values are merged with navigation in this script, IGRF corrections were applied, and Magnetic anomalies (total measured magnetic field minus IGRF fieldto derive MagAnom) were calculated. Values from the World Digital Magnetic Anomaly Map Grid (WDMAM, Maus and others, 2007) were sampled at each shipboard observation point for comparison with the measured magnetic anomalies (results in WDMAM v1.1). run_average_bath02: creates 1-minute averages of centerbeam depth. Plot_daily_mag01_new: creates a multi-panel plot with 1-minute averaged magnetic anomaly against the WDMAM grid, centerbeam depth, and sensor signal level from daily cruise data. This script was modified mid-cruise to include a panel displaying the magnetometer signal level, and the estimated magnetometer depth. A description of this calculation can be found in the G-882 owners manual listed in the cross reference section of this metadata file (Geometrics, Inc., 2005). plot_map: plots maps showing cumulative track for the cruise superimposed on ETOPO1 bathymetry, satellite-altimetry-derived gravity grid (Sandwell and Smith, 2009), WDMAM grid, and a blank background. run_create_info_files: generates an informational summary file of the data and plots. This script generates a text file made of the first and last 10 lines of each daily data file. The output was used for troubleshooting and quality assurance while on the ship.

A summary (text) file was written from the above processing stream. The first 4 lines of the output file are:

#Longitude Latitude DateTime MagTotal(nT) MagSignalLevel MagDepth(mV) MagDepth(m) IGRF(nT) MagAnom(nT) WDMAM_v1.1(nT) -72.761622 39.630968 2014-08-22T06:34:00Z 51257.74 1042.2 0824.9 11.8 51271.50 -13.76 18.02 -72.759143 39.628698 2014-08-22T06:35:00Z 51255.40 1163.4 0825.7 11.8 51269.90 -14.50 17.10 -72.756638 39.626415 2014-08-22T06:36:00Z 51253.87 1390.4 0808.6 11.5 51268.20 -14.33 16.17

Process_Date: 2014
Process_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Matthew A. Arsenault
Contact_Organization: U.S. Geological Survey

Contact_Position: Geologist
Contact_Address:

Address_Type: mailing and physical address
Address: 384 Woods Hole Road
City: Woods Hole
State_or_Province: Massachusetts
Postal_Code: 02543
Country: USA

Contact_Voice_Telephone: 508-548-8700 x2354
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: marsenault@usgs.gov

Process_Step:

Process_Description:

The 1 minute averaged navigation was downloaded (post-cruise) from the Rolling Deck to Repositry (R2R) website (Lamont-Doherty Earth Observatory, 2014), and merged using a C-shell script, run_merge_r2rnav_gravmag, provided by Daniel Scheirer of the USGS.

The R2R 1-minute navigation does not always have time-stamps at the even minute mark; occasionally a record appears where the seconds value equals 01 or 59. This makes the merging with the 1-minute geophysical records difficult, and that is why the navigation is fixed using routines within the C-shell script.

The output is a text file, which is provided with this data release.

Process_Date: 2017
Process_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Matthew A. Arsenault
Contact_Organization: U.S. Geological Survey

Contact_Position: Geologist
Contact_Address:

Address_Type: mailing and physical address
Address: 384 Woods Hole Road
City: Woods Hole
State_or_Province: Massachusetts
Postal_Code: 02543
Country: USA

Contact_Voice_Telephone: 508-548-8700 x2354
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: marsenault@usgs.gov

Process_Step:

Process_Description:

The 1 minute average of Langseth magnetics data file was imported into Esri ArcMap 10.3 using ArcCatalog, Create Feature Class from XY Table, specifying geographic coordinates, WGS84 coordinate system (EPSG code 4326). The point shapefile was visually inspected for problems with the data points. None were identified, so the data was believed complete.

Process_Date: 2017
Process_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Matthew A. Arsenault
Contact_Organization: U.S. Geological Survey

Contact_Position: Geologist
Contact_Address:

Address_Type: mailing and physical address
Address: 384 Woods Hole Road
City: Woods Hole
State_or_Province: Massachusetts
Postal_Code: 02543
Country: USA

Contact_Voice_Telephone: 508-548-8700 x2354
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: marsenault@usgs.gov

Process_Step:

Process_Description:

An error was fixed in one of the originator names. Also fixed in the suggested citation.

Process_Date: 20180192
Process_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: U.S. Geological Survey
Contact_Person: VeeAnn A. Cross

Contact_Position: Marine Geologist
Contact_Address:

Address_Type: Mailing and Physical
Address: 384 Woods Hole Road
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598

Contact_Voice_Telephone: 508-548-8700 x2251
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: vatnipp@usgs.gov

Process_Step:

Process_Description:

Added keywords section with USGS persistent identifier as theme keyword.

Process_Date: 20200908
Process_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: U.S. Geological Survey
Contact_Person: VeeAnn A. Cross

Contact_Position: Marine Geologist
Contact_Address:

Address_Type: Mailing and Physical
Address: 384 Woods Hole Road
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598

Contact_Voice_Telephone: 508-548-8700 x2251
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: vatnipp@usgs.gov

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Vector
Point_and_Vector_Object_Information:

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: Entity point
Point_and_Vector_Object_Count: 24697

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Geographic:

Latitude_Resolution: 0.0000001
Longitude_Resolution: 0.0000001
Geographic_Coordinate_Units: Decimal degrees

Geodetic_Model:

Horizontal_Datum_Name: GCS_WGS_1984
Ellipsoid_Name: WGS_1984
Semi-major_Axis: 6378137.000000
Denominator_of_Flattening_Ratio: 298.257224

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: 2014-011-FA_mag
Entity_Type_Definition:

1-minute averaged navigation and marine magnetics data collected by the U.S. Geological Survey in U.S. Atlantic Seaboard in 2014

Entity_Type_Definition_Source: U.S. Geological Survey

Attribute:

Attribute_Label: FID
Attribute_Definition: Internal feature number
Attribute_Definition_Source: Esri
Attribute_Domain_Values:

Unrepresentable_Domain:

Sequential unique whole numbers that are automatically generated.

Attribute:

Attribute_Label: Shape
Attribute_Definition: Feature geometry
Attribute_Definition_Source: Esri
Attribute_Domain_Values:

Unrepresentable_Domain: Coordinates defining the features

Attribute:

Attribute_Label: F_Longitud
Attribute_Definition:

X-coordinate representing longitude location of magnetic measurement (geographic, WGS84)

Attribute_Definition_Source: U.S. Geological Survey
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: -76.085053
Range_Domain_Maximum: -65.769170
Attribute_Units_of_Measure: decimal degrees
Attribute_Measurement_Resolution: 0.000001

Attribute:

Attribute_Label: Latitude
Attribute_Definition:

Y-coordinate representing latitude location of magnetic measurement (geographic, WGS84)

Attribute_Definition_Source: U.S. Geological Survey
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 30.677010
Range_Domain_Maximum: 39.630968
Attribute_Units_of_Measure: decimal degrees
Attribute_Measurement_Resolution: 0.000001

Attribute:

Attribute_Label: DateTime
Attribute_Definition:

Calendar date (year, month, day) and time of observation. This date and time is UTC in the format YYYY-MM-DDTHH:MM:SSZ where T indicates the end of the Year, month and day notation, and Z indicates that the time is 'Z' or UTC time.

Attribute_Definition_Source: U.S. Geological Survey
Attribute_Domain_Values:

Unrepresentable_Domain: text in the format YYYY-MM-DDTHH:MM:SSZ

Attribute:

Attribute_Label: MagTotal_n
Attribute_Definition: Measured magnetic field intensity, in nanoteslas (nT)
Attribute_Definition_Source: U.S. Geological Survey
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 45710.53
Range_Domain_Maximum: 51302.48
Attribute_Units_of_Measure: nanoteslas
Attribute_Measurement_Resolution: 0.01

Attribute:

Attribute_Label: MagSignalL
Attribute_Definition: Measured magnetometer Signal Level in millivolts
Attribute_Definition_Source: U.S. Geological Survey
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 626.6
Range_Domain_Maximum: 1559.7
Attribute_Units_of_Measure: millivolts
Attribute_Measurement_Resolution: 0.1

Attribute:

Attribute_Label: MagDepth_m
Attribute_Definition:

Depth of magnetometer below the sea surface based on depth transducer strain gauge. Units are millivolts, produced by the sensor in the magnetometer.

Attribute_Definition_Source: U.S. Geological Survey
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 254.1
Range_Domain_Maximum: 3495
Attribute_Units_of_Measure: milivolts
Attribute_Measurement_Resolution: 0.1

Attribute:

Attribute_Label: MagDepth_1
Attribute_Definition:

Magnetometer depth below sea surface in meters, calculated from the millivolts measurement produced on the internal depth transducer strain gauge in the magnetometer

Attribute_Definition_Source: U.S. Geological Survey
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 2.5
Range_Domain_Maximum: 55.3
Attribute_Units_of_Measure: meters
Attribute_Measurement_Resolution: 0.1

Attribute:

Attribute_Label: IGRF_nT_
Attribute_Definition:

International Geomagnetic Reference Field measurement in nanoteslas (nT). The International Geomagnetic Reference Field (IGRF) is a standard mathematical description of the large-scale structure of the Earth's main magnetic field and its secular variation.

Attribute_Definition_Source: U.S. Geological Survey
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 45820.9
Range_Domain_Maximum: 51271.5
Attribute_Units_of_Measure: nanoteslas
Attribute_Measurement_Resolution: 0.1

Attribute:

Attribute_Label: MagAnom_nT
Attribute_Definition:

1-minute averaged magnetic anomaly in nanoteslas (nT). This is measured value (MagTotal_n) minus IGRF (IGRF_nT_)

Attribute_Definition_Source: U.S. Geological Survey
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: -2274.95
Range_Domain_Maximum: 282.75
Attribute_Units_of_Measure: nanoteslas
Attribute_Measurement_Resolution: 0.01

Attribute:

Attribute_Label: WDMAM_v1_1
Attribute_Definition: Values from the World Digital Magnetic Anomaly Map Grid
Attribute_Definition_Source: U.S. Geological Survey
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: -77.75
Range_Domain_Maximum: 246.74
Attribute_Units_of_Measure: nanoteslas
Attribute_Measurement_Resolution: 0.01

Overview_Description:

Entity_and_Attribute_Overview:

The data are also available as a text file with the following columns headers: #Longitude Latitude DateTime MagTotal(nT) MagSignalLevel MagDepth(mV) MagDepth(m) IGRF(nT) MagAnom(nT) WDMAM v1.1(nT). These column headers correspond to the following shapefile attributes respectively: F_Longitud, Latitude, DateTime, MagTotal_n, MagSignalL, MagDepth_m, MagDepth_1, IGRF_NT, MagAnom_nT, WDMAM_v1.1.

Entity_and_Attribute_Detail_Citation: none

Distribution_Information:

Distributor:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Nathan C. Miller
Contact_Organization: U.S. Geological Survey

Contact_Position: Geologist
Contact_Address:

Address_Type: mailing and physical address
Address: 384 Woods Hole Road
City: Woods Hole
State_or_Province: Massachusetts
Postal_Code: 02543
Country: USA

Contact_Voice_Telephone: 508-548-8700 x2293
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: ncmiller@usgs.gov

Resource_Description:

USGS data release 2014-011-FA magnetics data from the Atlantic Ocean (2014-011-FA_mag.zip). The compressed file contains an ascii text file: 2014-011-FA_mag.txt, an Esri formatted vector shapefile in geographic coordinates (2014-011-FA_mag.shp and other shapefile components), a mapview image of the data (2014-011-FA_mag.jpg), a PDF file of the daily data plots (MGL1407_Magnetics_Daily_Plots.pdf), and Federal Geographic Data Committee (FGDC) Content Standards for Digital Geospatial Metadata (CSDGM) metadata files in xml, txt and html formats are also included in the compressed file.

Distribution_Liability:

Neither the U.S. Government, the Department of the Interior, nor the USGS, nor any of their employees, contractors, or subcontractors, make any warranty, express or implied, nor assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, nor represent that its use would not infringe on privately owned rights. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of these data or related materials. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Format_Name: Shapefile
Format_Version_Number: ArcGIS 10.3
Format_Specification: Esri point shapefile
Format_Information_Content:

Compressed file containing 1-minute averaged navigation and marine magnetics data from the U.S. Seaboard of the Atlantic Ocean survey area. This also includes associated metadata and *.txt file containing xy coordinates (Geographic, WGS84, EPSG code 4326), as well as the PDF file of the daily plots.

File_Decompression_Technique: Use WinZip, 7zip, Peazip or pkUnzip
Transfer_Size: 2.7

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name:

https://cmgds.marine.usgs.gov/data/field-activity-data/2014-011-FA/data/geophysics/2014-011-FA_mag.zip

Network_Resource_Name:

https://cmgds.marine.usgs.gov/data/field-activity-data/2014-011-FA/

Network_Resource_Name: https://doi.org/10.5066/F7V69HHS

Access_Instructions:

Network Resource links are provided as easy shortcuts to informational resources. The first link is for downloading a compressed file containing all of the data. The second link is a link to the data catalog page of the publication. The third link also goes to the data catalog page of the publication, but does so via the DOI publication number.

Digital_Form:

Digital_Transfer_Information:

Format_Name: TEXT
Format_Version_Number: unknown
Format_Specification: text file space-delimited
Format_Information_Content:

File_Decompression_Technique: Use WinZip, 7zip, Peazip or pkUnzip
Transfer_Size: 2.7

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name:

https://cmgds.marine.usgs.gov/data/field-activity-data/2014-011-FA/data/geophysics/2014-011-FA_mag.zip

Network_Resource_Name:

https://cmgds.marine.usgs.gov/data/field-activity-data/2014-011-FA/data/geophysics/2014-011-FA_mag.txt

Network_Resource_Name:

https://cmgds.marine.usgs.gov/data/field-activity-data/2014-011-FA/

Network_Resource_Name: https://doi.org/10.5066/F7V69HHS

Access_Instructions:

Network Resource links are provided as easy shortcuts to informational resources. The first link is for downloading the zip file contain all the data and metadata. The second link is to the text file containing the data in a space-delimited text file. The third link is a link to the data catalog page of the publication. The fourt link also goes to the data catalog page of the publication, but does so via the DOI publication number.

Digital_Form:

Digital_Transfer_Information:

Format_Name: PDF
Format_Version_Number: 1.0
Format_Specification: Adobe PDF
Format_Information_Content:

Transfer_Size: 2.7

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name:

https://cmgds.marine.usgs.gov/data/field-activity-data/2014-011-FA/data/geophysics/2014-011-FA_mag.zip

Network_Resource_Name:

https://cmgds.marine.usgs.gov/data/field-activity-data/2014-011-FA/data/geophysics/MGL1407_Magnetics_Daily_Plots.pdf

Network_Resource_Name:

https://cmgds.marine.usgs.gov/data/field-activity-data/2014-011-FA/

Network_Resource_Name: https://doi.org/10.5066/F7V69HHS

Access_Instructions:

Network Resource links are provided as easy shortcuts to informational resources. The first link is for downloading the zip file contain all the data and metadata. The second link is to the PDF file containing the containing the shipboard plots. The third link is a link to the data catalog page of the publication. The fourt link also goes to the data catalog page of the publication, but does so via the DOI publication number.

Fees: none

Technical_Prerequisites:

This compressed file contains data available in Esri shapefile format, space-delimited text files, and PDF plots. The compressed file also contains associated metadata. The user must have software to read and process the data file.

Marine magnetics data collected by the U.S. Geological Survey in U.S. Atlantic Seaboard in 2014 (Geographic, WGS84, point shapefile 2014-011-FA_mag.shp)

Metadata: