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USGS Coastal and Marine Geology Program

Field Activity Details for field activity 1999-014-FA

Other ID: none

Status: Completed

Organization(s): USGS, Woods Hole Coastal and Marine Science Center

Funding Program(s):

Principal Investigator(s): David Twichell

Affiliate Investigator(s): University of Nevada at Las Vegas

Information Specialist(s): David Twichell

Data Type(s): Seismics: Sub Bottom Profiler, Location-Elevation: Navigation, Sonar: Sidescan, Sonar: Single Beam

Scientific Purpose/Goals: Complete coverage sidescan sonar mosaic and dense grid of chirp sub-bottom profiles of Boulder Basin and Las Vegas Bay parts of Lake Mead to serve as base map for other environmental studies.


Start Port/Location: Callville Bay Marina, Lake Mead, NV

End Port/Location: Callville Bay Marina, Lake Mead, NV

Start Date: 1999-05-12

End Date: 1999-05-26

Equipment Used: P-code GPS, Odom Digitrace 200kHz, SIS1000 Chirp Sonar, SIS1000 Sidescan sonar

Information to be Derived:

Summary of Activity and Data Gathered: No web site exists yet, but preliminary interpretation of results from this field operation are summarized in USGS Open-File Report 99-581.

Staff: VeeAnn Cross, Kenneth F. Parolski, David Twichell

Affiliate Staff:
Mark Rudin

Notes: Original Center People field contained: Dave Twichell - PI; Ken Parolski - Electronics tech; VeeAnn Cross - Seismic and sidescan processor.
Project = Geophysical investigation of Lake Mead, Geophysical investigation of Lake Mead


Lake Mead, Nevada, Arizona, United States, North America;

North: 36.15112082 South: 36.01251146 West: -114.86298052 East: -114.58357804




Cross, V.A., and Twichell, D.C., 2003, Archive of seismic-reflection data collected during USGS Cruise Lake Mead 99014 in Lake Mead - Nevada and Arizona, 14-25 May, 1999: U.S. Geological Survey Open-File Report 2003-3,

Twichell, D.C., and Cross, V.A., 2009, Surficial geology of the floor of Lake Mead (Arizona and Nevada) as defined by sidescan-sonar imagery, lake-floor topography, and post-impoundment sediment thickness: U.S. Geological Survey Open-File Report 2009-1150, CD-ROM,

Twichell, D.C., Cross, V.A., and Belew, S.D., 2004, Mapping the floor of Lake Mead (Nevada and Arizona)—Preliminary discussion and GIS data release: U.S. Geological Survey Open-File Report 2003-320, DVD, URL:

Twichell, D.C., Cross, V.A., Rudin, M.J., and Parolski, K.F., 2000, Surficial geology and distribution of post-impoundment sediment of the western part of Lake Mead based on a sidescan sonar and high-resolution seismic-reflection survey: U.S. Geological Survey Open-File Report 99-581, 28 p., URL:

Twichell, D.C., Cross, V.A., Rudin, M.J., Parolski, K.F., and Rendigs, R.R., 2001, Surficial geology and distribution of post-impoundment sediment in Las Vegas Bay, Lake Mead: U.S. Geological Survey Open-File Report 2001-70, 27 p., URL:


FAN 1999-014-FA has data viewable in the GeoMappApp/Virtual Ocean applications. To view this data in these applications go to and See the instructions for locating USGS data in these applications. You can also view the imagery created from the SEGY data at

Documents associated with this activity

Title Survey Equipment Description
Cruise log (document not focused on specific equipment) Watchstanders' log of data collection, navigation, equipment notes, disk and line changes. Times recorded, not navigation fixes.
ISIS log SIS1000 Sidescan sonar ISIS system log of file and line changes, data collection notes

Data Acquired

Survey EquipmentSurvey InfoData Type(s)Data Collected
P-code GPS --- Navigation
1999-014-FA-LN-001 (All navigation data acquired on the field activity)
Odom Digitrace 200kHz --- Single Beam
Bathymetry GIS data
SIS1000 Chirp Sonar --- Sub Bottom Profiler
1999-014_Chirp_shot_nav (Point shapefile of shot point navigation at 100 shot intervals.)
1999-014 seisnav (Trackline navigation of chirp seismic data)
1999-014-FA-SE-001-01 (RAW seismic data images)
1999-014-FA-SE-001-02 (Interpreted seismic data images)
1999-014-FA-SE-001-03 (Raw SEGY data)
SIS1000 Sidescan sonar --- Sidescan
1999-014_sscan_mosaic (Boulder Basin enhanced sidescan sonar mosaic - UTM projection.)
1999-014_sscan_mosaic_geog (Boulder Basin enhanced sidescan sonar mosaic - geographic coordinate system.)

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