USGS Coastal and Marine Geology Program

Coastal & 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): Location-Elevation: Navigation, Seismics: Boomer, 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 Date: 1999-05-12

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

End Date: 1999-05-26

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

Equipment Used: SIS1000 Sidescan sonar, Echosounder, GPS (wh), Boomer, Single channel hydrophone

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 Atnipp Cross, Kenneth E. 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: 36.2 South: 36 West: -114.9 East: -114.6




Cross, V.A.A., and Twichell, David C., 2003, Archive of seismic-reflection data collected during USGS Cruise Lake Mead 99014 in Lake Mead - Nevada and Arizona, 14-25 May, 1999: .

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 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

Data Acquired

Survey EquipmentSurvey InfoData Type(s)Data Collected
SIS1000 Sidescan sonar --- Boomer
1999-014-FA-SO-001-01 ( Sidescan mosaic images)
Sidescan mosaic ( )
Echosounder --- Single Beam
Bathymetry GIS data ( )
GPS (wh) --- Navigation
1999-014-FA-LN-001 ( navigation data)
Boomer --- Boomer
Single channel hydrophone --- Air Gun / Water Gun
Bubble Gun
Sub Bottom Profiler
1999-014-FA-SE-001-03 ( Raw SEGY data)
1999-014-FA-SE-001-01 ( RAW seismic data images)
1999-014-FA-SE-001-02 ( Interpreted seismic data images)
Boomer seismic data ( )