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ID L-S1-04-CA
Abstract United States Geological Survey, Menlo Park, California,Pacific Gas and Electric Company. Chief Scientist: Rob Kayen. Geophysical data of field activity L-S1-04-CA in California from 09/28/2004 to 09/28/2004
Organization United States Geological Survey, Menlo Park, California
Pacific Gas and Electric Company
Project/Theme Earthquake Hazards
Chief Scientist Rob Kayen
Activity Type Geophysical
Platform Land
Area of Operation California
Bounding Coordinates
-120.56290    -120.20560
Ports LEAVE Parkfield, California
ARRIVE Parkfield, California
Dates 09/28/2004 (JD 272) to 09/28/2004 (JD 272)
Analog Materials No analog holdings.
Information Specialist
Rob Kayen
To measure the shear-wave velocity profile of the near-surface materials at
strong motion stations that recorded the 28 September 2004 M 6.0 Parkfield
Information to be Derived
One-dimensional shear-wave velocity profiles at 53 strong motion sites near 
Parkfield, CA.
Estimate the shear-wave velocity profiles with the Spectral Analysis of Surface
Waves (SASW) method.
The CMG surface wave shaker trailer is a parallel array of mass shakers - an
array of up to eight APS Dynamic Model 400 shaker and amplifier units, powered
by two generators and controlled by a spectral analyzer.
Site numbers 807-859.  The SASW method is a noninvasive method that indirectly 
estimates the
shear-wave veolcity at depth from variations in the Reyleigh wave phase
velocity at the surface.
To address the uncertainty associated with these measurements, we compare the 
SASW profiles to surface-source downhole-receiver (SSDR) profiles at four sites.
Three of the four SSDR sites are in close agreement with the adjacent SASW site, 
while the SASW profile is considerably slower than the SSDR profile at one site.
Got Help? For L-S1-04-CA, we would appreciate any information on -- analog materials, contract, crew, days at sea, dive count, equipment used, funding, kms of navigation, national plan, NGDC Info, owner, 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    
Seismic data      
Times   060.times    

L-S1-04-CA location map of where navigation 

equipment operated

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