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USGS CMG F-2-95-NC Metadata

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ID F-2-95-NC
Abstract United States Geological Survey, Menlo Park, California. Chief Scientists: Sam Clarke, Andy Stevenson. Geological and Geophysical data (Geopulse, 7khz, 200khz, pcode) of field activity F-2-95-NC in Big Lagoon, Stone Lagoon - Northern California from 09/27/1995 to 09/29/1995
Organization United States Geological Survey, Menlo Park, California
Project/Theme Crustal Earthquake Hazards
Chief Scientist Sam Clarke
Andy Stevenson
Activity Type Geological and Geophysical
Platform Fast Eddy
Area of Operation Big Lagoon, Stone Lagoon - Northern California, Northern California
Bounding Coordinates
41.75000
-125.75000    -122.25000
37.75000
Dates 09/27/1995 (JD 270) to 09/29/1995 (JD 272)
Analog Materials No analog holdings.
Crew
Sam Clarke Chief Scientist, USGS Western Region
Andy Stevenson Chief Scientist, USGS Western Region
Equipment Used
Geopulse
7khz
200khz
pcode
Purpose
To obtain evidence of faulting and other coseismic
        deformation from lagoonal sediments in water bodies developed on the
        lower plates of thrust faults in an active forearc thrust belt. Data
        will be used to locate core sites for follow-on coring program to date
        fault offset and determine deformation rates.
Information to be Derived
High-resolution seismic reflection data from upper 10-30 m of
sedimentary section. Seismic reflection profiles with interpretation; possibly,
bathymetric maps of the lagoons.
Summary
Successful in Big and Stone Lagoons, with 1/8 and 1/4 sec Geopulse, 1/8
sec 700 kHz, and 200 kHz fathometer data obtained both. Minor problems with GPS
locations. Water level in Lake Earl was too low (~4' MSL) to permit launch of
Fast Eddy at available launch sites. Plan to return to Lake Earl when lake level
is greater than ~6 ft MSL.
Notes
Analog records from the systems employed. The seemingly annual
end-of-the-fiscal-year fun in northern California-Oregon this year involved
collection of high-resolution seismic data from Big Lagoon and Stone Lagoon
north of Eureka, California.

The crew of Sam Clarke, Andy Stevenson, and Dave Hogg aboard "Fast" Eddy
collected 40 lines of Geopulse, 7kHz, and 200 Khz data from the lagoons, seeking
evidence of faulting and coseismic deformation from the lower plates of thrust
faults in an active forearc thrust system.

We hope that this information will ultimately contribute to knowledge of
earthquake recurrence intervals and magnitudes. There were some
difficulties with P-code GPS locations, and interpretation remains, but the
data look good and should provide bonus information on processes related to
flushing and filling of the lagoons. The water level in Lake Earl, near
Crescent City, was too low to launch Eddy, so we missed one target.  Great
weather (mostly), elk herds, river otter, and a brief road race with a
black bear -- geology at its best.
Got Help? For F-2-95-NC, we would appreciate any information on -- analog materials, contract, days at sea, dive count, funding, information specialist, kms of navigation, national plan, NGDC Info, owner, ports, project number, publications, scanned materials, seismic description, station count, station description, submersible, tabulated info.
Type Webpage KMZ Arc         Metadata        
Metadata data     txt  data  FAQ  xml
Navigation data nav    
Times   050.times    

F-2-95-NC location map of where navigation 

equipment operated

 
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Page Last Modified: Tue Oct 29 09:59:31 PDT 2013  (chd)