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ID L-1-91-NC
Abstract Chief Scientists: Pat Hart, Jill McCarthy. Geophysical data (3dot5khz, 12khz, uniboom, airgun, airgunmonitor) of field activity L-1-91-NC in San Francisco Bay from 09/03/1991 to 09/20/1991
Project/Theme Bay Area Seismic Imaging Experiment (BASIX)
Chief Scientist Pat Hart
Jill McCarthy
Activity Type Geophysical
Platform Samuel Phillips Lee
Area of Operation San Francisco Bay, Northern California
Bounding Coordinates
38.11173
-123.52004    -121.70993
37.20842
Dates 09/03/1991 (JD 246) to 09/20/1991 (JD 263)
Analog Materials list
Crew
Al McClenaghan Ship Captain
Chris Poppe Chief Mate, USGS Western Region
Bill Lafleur Chief Engineer, USGS Western Region
Jill McCarthy Chief Scientist, USGS Western Region
Kevin O'Toole Mechanical Technician, USGS Western Region
Walt Olson Mechanical Technician, USGS Western Region
Larry Kooker Electronics Technician, USGS Western Region
Bill Robinson Electronics Technician, USGS Western Region
Jim Vaughan Electrical Engineer, USGS Western Region
Dave Hogg Electronics Technician, USGS Western Region
Kaye Kinoshita Navigator, USGS Western Region
George Knudson Mechanical Technician, Fairfield
Steve Higgins Electronics Technician, Fairfield
Mike Pawlik Electronics Technician, Fairfield
Tom McEvilly Geophysicist, University of California, Lawrence Berkeley Laboratories
Pat Hart Geophysicist, USGS Western Region
Jon Childs Geophysicist, USGS Western Region
Kevin Furlong Geophysicist, Pennsylvania State University
Terry Proffer Geophysicist, Haliburton Geophysicist.
Pat McClellan Geophysicist, City Of San Leandro
Mike Marlow Watchstander, USGS Western Region
Kathy Furlong Unspecified Investigator, Pennsylvania State University
Kate King Unspecified Investigator, CNN
Rick Blackbird Unspecified Investigator, CNN
Chris Vincent Unspecified Investigator, CNN
Gordon Smith Ship Captain, David Johnston
Mark McLaughlin Unspecified Investigator, David Johnston
Tom Parsons Unspecified Investigator, Stanford University - David Johnston
Michael Hamer Navigator, David Johnston, USGS Western Region
Roberto Anima Ship Captain, Fast Eddy, USGS Western Region
Shawn Dadisman Unspecified Investigator, Fast Eddy, USGS Western Region
Armando Buciaga Unspecified Investigator, Fast Eddy, USGS Western Region
Tom Chase Ship Captain, Chase Boat, USGS Western Region
Pete Dartnell Unspecified Investigator, Chase Boat, USGS Western Region
Roy Kiesling Vol. Unspecified Investigator, Chase Boat, USGS Western Region
Greg Gabel Ship Captain, Caltrans
Holly Ryan Unspecified Investigator, Caltrans
David Verdonck Geophysicist, Pennsylvania State University, LLL
Dennis Mann Ship Captain, Revenge, USGS Western Region
Ray Sliter Unspecified Investigator, Revenge, USGS Western Region
Joe Svitek Unspecified Investigator, Revenge, USGS Western Region
Rich Clymer Unspecified Investigator, Mako, USGS Western Region
Pat Williams Unspecified Investigator, Mako, USGS Western Region
Peter Barnes Ship Captain, R/V Estero, USGS Western Region
Erik Gize Unspecified Investigator, R/V Estero, USGS Western Region
Jean Riordan Unspecified Investigator, USGS Western Region
Norman Maher Unspecified Investigator, USGS Western Region
Vicky Goetcheus Unspecified Investigator, USGS Western Region
Dave Scholl Geophysicist, USGS Western Region
Eleni Karageorgi Unspecified Investigator, Lawrence Berkeley Laboratories
Joel Rosenbaum Photographer, Vacaville Reporter
Robert Reed Unspecified Investigator, Vacaville Reporter
George Thompson Geophysicist, Stanford University
Ben Page Geophysicist, USGS Western Region
David McMahon Unspecified Investigator, BC&DC
Doug Prose Photographer, USGS Western Region
Nina Luttinger Photographer, USGS Western Region
Tracy Vallier Geologist, USGS Western Region
Andy Michael Geophysicist, USGS Western Region
Stephanie Ross Navigator, USGS Western Region
Diana Collins Unspecified Investigator, USGS Western Region
June Matsueyda Unspecified Investigator, USGS Western Region
Equipment Used
3dot5khz
12khz
uniboom
airgun
airgunmonitor
Purpose
Furlong and others (1989) proposed the possibility that the network
of faults that bound the San Francisco Bay Area are linked structurally and
are all part of an evolving fault system. To test the Furlong and others (1989)
model and to obtain fundamental information on the crustal structure and fault
geometries that underlie the San Francisco Bay Area, the USGS, in conjunction
with the University of California, Stanford University, Pennsylvania State
University, and Lawrence Berkeley Laboratory, conducted a major seismic
reflection investigation in the fall of 1991 utilizing the marine waterway
system that dissects the Bay Area. This study, known as the Bay Area Seismic
Imaging Experiment (BASIX) consisted of three complementary seismic
reflection and refraction profiling methods: high resolution seismic reflection
profiling, wide-angle reflection/refraction profiling, and multichannel
seismic profiling. The high-resolution, shallow penetration data were
acquired to constrain near-surface faulting, while the wide-angle reflection/
refraction data were acquired to constrain the deep-crustal velocity
structure of the crust. (Open-File Report 93-301).
Information to be Derived
Three complementary seismic reflection and refraction profiling
methods: high resolution seismic reflection profiling, wide-angle
reflection/refraction profiling, and multichannel seismic profiling. The
high-resolution, shallow penetration data were acquired to constrain
near-surface faulting, while the wide-angle reflection/refraction data were
acquired to constrain the deep-crustal velocity structure of the crust.
(Open-File Report 93-301).
Summary
A total of 140 km of multichannel reflection data were acquired across
the San Francisco Bay Area during 14 nights of profiling. Although each night
of profiling was assigned a different line number, several of the lines overlap
and they were thus processed together as merged profiles. All totaled, there
were four distinct segments to the experiment. The first segment began in
the Sacramento River near Rio vista and proceeded west through Honker, Suisun,
and San Pablo Bays (lines 101 through 110). The next two segments ran north-
south from Richmond to Angel Island (line 113), and from the Bay Bridge to
just north of the San mateo Bridge (line 111). The fourth and final segment
began in the vicinity of Alcatraz Island and extended west underneath the
Golden Gate Bridge, 6 km into the open waters of the Pacific (lines 201-202).

60 to 118 Telseis receivers were moored to the edge of the dredged shipping
channel at 100 to 200 m intervals for a fixed spread of 6 to 12 km in length.
Each day the receiver array was repositioned, and each night the S.P. Lee
steamed along the hydrophone array, with its airgun array firing.

The day-to-day small-boat operations began first with the retrieval of the
Telseis instruments deployed the previous day. This process utilized a fleet
of 4-5 small boats that ranged in size from 6 to 15 m. Once retreived, the
instruments were brought back to the S.P. Lee for recharging. The R.V. David
Johnston trailed behind these small vessels and recovered the associated buoys
and anchors. The Johnston also recorded navigational fixes, which were
required in order to check for possible drift of the instrument sites during
the night; although anchors were used to maintain instrument position, currents
were strong enough in a few areas to move the anchors between deployment and
retrieval.

Once the instrument retrieval was complete, the Johnston would begin laying
out the next line segment. A GPS and Del Norte triangulation system were used
to measure the 100- or 200-m distance separating instrument sites. The
receiver line was positioned so as to minimize bends in the profile and to
keep the buoys out of the active shipping channel. At each site, anchors
were deployed and navigation fixes were taken; the anchored sites were marked by 
orange buoys. The smaller boats followed behind and clipped the recharged
Telseis units with cabled hydrophones to these buoys. The hydrophones were
weighted so as to minimize movement on the seafloor.

The final phase of operation was airgun profiling. Each night the S.P. Lee
acquired approximately 24 km of reflection data by looping through the
receiver array twice. Along 10 of the 13 multichannel lines the S.P. Lee fired
the airgun array while steaming first from east to west and then, reversing
course, duplicated the line by steaming from west to east, further doubling
the number of airgun shots available for stacking of the seismic signal.

In addition to the 13 reflection lines acquired in San Francisco Bay and the
Golden Gate region, the airgun array on the S.P. Lee was used primarily as a
seismic source for wide-angle profiles recorded along three other lines: the
N-S trending line OBS1 in San Francisco Bay; a short transit leg, line TR1
SW of the Golden Gate; and the E-W trending line OBS2 on the continental margin.
Lines OBS1 and OBS2 were obtained along two separate deployment of 6 USGS ocean 
bottom seismometers (OBS) deployed by investigators from the USGS Branch of
Atlantic Marine Geology and Woods Hole Oceanographic Institution. The shot
interval along line 112/OBS1 was 50 m. The shot interval for lines TR1 and
OBS2 was approximately 75 m. Line OBS2 was located coincident to seismic
reflection line 13 of Lewis (1990) in order to provide deep structural control
on the continental margin west of the San Andreas fault.
Publications
Anima, R.J., Williams, Patrick L., and McCarthy, J., 1992,
High-resolution marine seismic reflection profiles across East Bay
faults, in Galehouse, Jon S., ed., Programs and abstracts of the
Second conference on Earthquake hazards in the eastern San Francisco
Bay area: California Division of Mines and Geology Special
Publication, v. 113, p. 4.

Hart, P.E., Clymer, R.W., and Karageorgi, E.D., 1992, Geometry of the San Francisco Bay area faults; preliminary results from BASIX, in Galehouse, Jon S., ed., Programs and abstracts of the Second conference on Earthquake hazards in the eastern San Francisco Bay area: California Division of Mines and Geology Special Publication, v. 113, p. 30.

McEvilly, T.V., and McCarthy, Jill, 1992, BASIX; the Bay Area Seismic Imaging Experiment report, in Galehouse, Jon S., ed., Programs and abstracts of the Second conference on Earthquake hazards in the eastern San Francisco Bay area: California Division of Mines and Geology Special Publication, v. 113, p. 47.

McCarthy, Jill, and Hart, Patrick E., 1993, Data report for the 1991 Bay area seismic imaging experiment (BASIX): U.S. Geological Survey Open-File Report 93-0301, 26 p.

Hart, P., McCarthy, J., Karageorgi, E., and McEvilly, T., 1993, Seismic reflection profiling in the San Francisco Bay area; the 1991 Bay Area Seismic Imaging Experiment (BASIX): Geological Society of America Abstracts with Programs, v. 25, no. 6, p. 417-418.

McCarthy, J., Hart, P., Karageorgi, E., and McEvilly, T., 1993, Seismic profiling across an evolving transform margin; results from the 1991 Bay Area Seismic Imaging eXperiment (BASIX): Geological Society of America Abstracts with Programs, v. 25, no. 6, p. 310.

Brocher, Thomas M., McCarthy, Jill, Hart, Patrick E., Holbrook, W. Steven, Furlong, Kevin P., McEvilly, Thomas V., Hole, John A., and Klemperer, Simon L., 1994, Seismic evidence for a lower-crustal detachment beneath San Francisco Bay, California: Science, v. 265, no. 5177, p. 1436-1439.

Childs, J.R., Hart, P.E., McCarthy, J., and Marlow, M.S., 1994, High-resolution seismic-reflection studies of submerged fault zones throughout the San Francisco Bay area: American Geophysical Union Eos, Transactions, v. 75, no. 44, Supplement, p. 684.

McCarthy, J., Hart, P.E., Anima, R., Oppenheimer, D., and Parsons, T., 1994, seismic evidence for faulting in the western Sacramento Delta region, Pittsburg, California: American Geophysical Union Eos, Transactions, v. 75, no. 44, Supplement, p. 684-685.

McCarthy, J., Hart, P.E., and Oppenheimer, D., 1995, High angle faulting in western Sacramento Delta region, Pittsburg, California: American Association of Petroleum Geologists Bulletin, v. 79, no. 4, p. 592.

Parsons, Tom, McCarthy, Jill, and Hart, P.E., 1994, The nature of lower crustal reflectors beneath San Francisco Bay, California: American Geophysical Union Eos, Transactions, v. 75, no. 44, Supplement, p. 643.

Williams, P.L., McEvilly, T.V., Anima, R., McCarthy, J., Nakata, T., Okamura, M., and Shimazaki, K., 1993, Fault activity, geometry, and recurrence behavior at the junction of the Rodgers Creek and Pinole faults, California: American Geophysical Union Eos, Transactions, v. 74, no. 43, Supplement, p. 411.

Holbrook, W. Steven, Brocher, T.M., McCarthy, Jill, Hole, J.A., and ten Brink, U.S., 1994, Crustal structure beneath the San Francisco Bay Block and Central California continental margin: American Geophysical Union Eos, Transactions, v. 75, no. 44, Supplement, p. 664.

Pope, D.C., Brocher, T.M., McCarthy, J., Karageorgi, E.D., and Holbrook, W.S., 1993, Comparison of recording technology for onshore-offshore seismic profiling of continental margins; examples from BASIX: American Geophysical Union Eos, Transactions, v. 74, no. 43, Supplement, p. 445.

Brocher, Thomas M., McCarthy, Jill, and Holbrook, W. Steven, 1996, Imaging the transform plate boundary in the San Francisco Bay area, California: Geological Society of America Abstracts with Programs, v. 28, no. 7, p. 216.

Brocher, Thomas M., and Moses, Michael J., 1993, Onshore-offshore wide-angle seismic recordings of the San Francisco Bay Area Seismic Imaging Experiment (BASIX): the five-day recorder data: U.S. Geological Survey Open-File Report 93-276, 89 p.
Got Help? For L-1-91-NC, we would appreciate any information on -- contract, days at sea, dive count, funding, information specialist, kms of navigation, national plan, NGDC Info, notes, organization, owner, ports, project number, scanned materials, seismic description, station count, station description, submersible, tabulated info.
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Navigation data nav    
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Times   065.times    

L-1-91-NC location map of where navigation 

equipment operated
L-1-91-NC location map of where navigation 

equipment operated

 
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