USGS Coastal and Marine Geology Program

Coastal & Marine Geology Program

Field Activity Details for field activity 2001-007-FA

Other ID: MEAD 01007; IB H-1-01-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): Location-Elevation: Navigation, Seismics: Boomer, Sonar: Sidescan, Sonar: Single Beam

Scientific Purpose/Goals: Sidescan sonar and high-resolution seismic reflection mapping of Lake Mead to map the surficial geology of the lake floor and the thickness and distribution of post-impoundment sediment in the lake.


Start Date: 2001-04-01

Start Port/Location: Callville Bay Marina, NV

End Date: 2001-04-26

End Port/Location: Callville Bay Marina, NV

Equipment Used: SIS1000 Sidescan sonar, Echosounder, Boomer, Plugger GPS, HYPACK, Single channel hydrophone

Information to be Derived:

Summary of Activity and Data Gathered: Sidescan sonar imagery and chirp sub-bottom profiles were collected along 955 km of survey tracklines. Data were collected along lines spaced 500-700 m apart and provided nearly complete sidescan coverage of the eastern two-thirds of the lake as well as a dense grid of sub-bottom profiles. Boomer sub-bottom profiles were collected along 96 km of tracks to provide deeper penetration in the areas of thick sediment cover.

Staff: Charles Worley, David Twichell, Kenneth E. Parolski, VeeAnn Atnipp Cross

Affiliate Staff:
Mark Rudin

Notes: Original Center People field contained: Dave Twichell - ch. sci.; Ken Parolski - mobilization and field technician; VeeAnn Cross - data processor and GIS specialist; Chuck Worley - cruise mobilization.
Project = Lake Mead Sediment Study, Lake Mead Sediment Study


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

North: 36.5 South: 36 West: -114.77 East: -114.01


photo of Houseboat-200


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: .

Cross, V.A.A., and Twichell, David C., 2003, Archive of seismic-reflection data collected during USGS Cruise Lake Mead 01007 in Lake Mead, Nevada and Arizona, 1-28 April, 2001: .

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:

Data Acquired

Survey EquipmentSurvey InfoData Type(s)Data Collected
SIS1000 Sidescan sonar --- Boomer
Sidescan mosaic ( )
Echosounder --- Single Beam
Bathymetry GIS data ( )
Boomer --- Boomer
Plugger GPS --- Navigation
Nav data ( )
HYPACK --- Navigation
Single channel hydrophone --- Air Gun / Water Gun
Bubble Gun
Sub Bottom Profiler
Chirp seismic data ( )
Boomer seismic data ( )
2001-007-FA-SE-001 ( Raw SEGY chirp data)
2001-007-FA-SE-002 ( Raw SEGY boomer data)