USGS Coastal and Marine Geology Program

Coastal & Marine Geology Program

Field Activity Details for field activity 2000-027-FA

Other ID: IB C-27-00-GC

Status: Completed

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

Funding Program(s):

Principal Investigator(s): David Twichell

Affiliate Investigator(s): Mark Rudin, UNLV

Information Specialist(s): David Twichell

Data Type(s): Imagery: Photo, Imagery: Video, Location-Elevation: Navigation, Sampling: Geology, Seismics: Sub Bottom Profiler, Sonar: Sidescan, Sonar: Single Beam

Scientific Purpose/Goals: Seismic and sidescan mapping of deltas along the edge of the Las Vegas Bay part of Lake Mead to serve as a base map for coring and other environmental monitoring studies.


Start Date: 2000-05-30

Start Port/Location: Las Vegas Bay Marina

End Date: 2000-06-09

End Port/Location: Las Vegas Bay Marina

Equipment Used: GPS (wh), ARGO, Edgetech DF-1000 sidescan sonar, Echosounder, Knudsen CHIRP Sub-bottom Profiler

Information to be Derived:

Summary of Activity and Data Gathered:

Staff: Kenneth E. Parolski, VeeAnn Atnipp Cross

Affiliate Staff:
Mark Rudin
co-chief scientist

Notes: A second component of the field work will include coring that will be completed during the week of July 11-18. This part of the work will require a P-code navigation system with a navigation laptop with MapInfo on it. The rest of the coring gear will come from elsewhere. Original Center People field contained: Ken Parolski - sidescan/seismic tech., VeeAnn Cross - data processor.
Project = Lake Mead Geophysical Survey, Lake Mead Geophysical Survey


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

North: 36.14 South: 36.08 West: -114.88 East: -114.73




Cross, V.A.A., and Twichell, David C., 2003, Archive of seismic-reflection data collected during USGS Cruise Lake Mead 00027 in Lake Mead - Nevada, 1-6 June, 2000: .

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: URL:

Twichell, D.C., Cross, VeeAnn A., and Belew, Stephen D., 2004, Mapping the floor of Lake Mead (Nevada and Arizona); preliminary discussion and GIS data release: URL:

Twichell, D.C., Cross, VeeAnn A., Rudin, Mark J., and Parolski, Kenneth 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: 28 URL:

Twichell, D.C., Cross, VeeAnn A., Rudin, Mark J., Parolski, Kenneth F., and Rendigs, Richard R., 2001, Surficial geology and distribution of post-impoundment sediment in Las Vegas Bay, Lake Mead: 27 URL:


FAN 2000-027-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

Data Acquired

Survey EquipmentSurvey InfoData Type(s)Data Collected
GPS (wh) --- Navigation
Nav data ( )
ARGO --- Photo
Edgetech DF-1000 sidescan sonar --- Sidescan
Sidescan mosaic ( )
Echosounder --- Single Beam
Bathymetry GIS data ( )
Knudsen CHIRP Sub-bottom Profiler --- Sub Bottom Profiler
2000-027-FA-SE-001 ( Raw SEGY data)
Chirp seismic data ( )