Joint SCEC-USGS Workshop on LARSE April 21, 1998

SOUTHERN CALIFORNIA EARTHQUAKE CENTER

DEPARTMENT OF THE INTERIOR
UNITED STATES GEOLOGICAL SURVEY

The Southern California Earthquake Center and the U.S. Geological Survey will host a one-day seminar/workshop on deep structure of the Los Angeles region, to be held on April 21 at UCLA. The seminar/workshop will concentrate in three areas where data has been or will be collected by the Los Angeles Region Seismic Experiment (LARSE):

1) Santa Monica area, the region of exaggerated shaking produced by the Northridge earthquake. In 1999, in LARSE II, seismic-imaging data will be collected along high-resolution profiles in this area.

2) LARSE Line 2. This line extends northward from San Clemente Island, through the Santa Monica Mts, through the Northridge epicenter, through the Transverse Ranges, across the San Andreas fault, and into the western Mojave Desert. In 1994, in LARSE I, airgun data were collected along this line. During the period Sept. 1998-Feb. 1999, in the first phase of LARSE II, teleseismic and local-earthquake data will be recorded along this line. During October 1999, in a second phase of LARSE II, explosion data will be collected along this line.

3) LARSE Line 1. This line extends northeastward from San Clemente Island, through the Los Angeles and San Gabriel Valley basins, through the San Gabriel Mts, across the San Andreas fault, and into the Mojave Desert. In 1993-1996, in various phases of LARSE I, teleseismic, airgun, local earthquake, and explosion data were collected along this line.

The agenda for the seminar/workshop is as follows:

9:00 AM--Introduction-- Paul Davis and Gary Fuis

Santa Monica area

9:10 AM--Overview of structure of the northern Los Angeles basin--Tom Wright
9:30 AM--Overview of the geology and neotectonics of the Santa Monica area--Jim Dolan
9:50 AM--Exaggerated shaking in the Santa Monica area from the Northridge earthquake-- Shangxing Gao
10:10 AM--Simulation of strong ground motion in the northern Los Angeles basin--Kim Olsen

10:30 AM--Coffee Break

10:40 AM--Simulation of strong ground motion in the Santa Monica area--Rob Graves
11:00-- Strong-motion effects of local crustal structure; exaggerated shaking in the Reseda area from the Northridge earthquake--Art Frankel
11:20 AM--The proposed LARSE II high-resolution experiment--Paul Davis
11:40 AM--Discussion.

12:00 AM--Lunch

LARSE Line 2

1:00 PM--Evolution of the Los Angeles basin region-- Pete Rumelhart
1:20 PM--Overview of the geologic structure of the Santa Susanna Mountains and San Fernando Valley--Bob Yeats
1:40 PM--Cross section through the Northridge epicenter--Jay Namson
2:00 PM--The Northridge earthquake and tomographic results along Line 2--Egill Hauksson
2:20 PM--The Northridge anticline--Gerry Simila
2:40 PM--Offshore LARSE MCS / tomographic results--Uri ten Brink

3:00 PM--Coffee Break

3:10PM--Onshore LARSE airgun results--Dave Okaya
3:30 PM--Onshore LARSE airgun results--Julie Norris
3:50 PM--The proposed LARSE II explosion experiment--Rob Clayton
4:10 PM--Discussion

LARSE Line 1

4:30 PM--Teleseismic results from LARSE --Monica Kohler
4:50 PM--Laboratory rock-velocity results integrated with tomographic and reflection results from LARSE --Nik Christensen and Gary Fuis
5:20 PM--Summary remarks--Paul Davis and Gary Fuis
5:30 PM--END

Paul Davis (PDAVIS@CYCLOP.ESS.UCLA.EDU)
University of California at Los Angeles
Dept. of Earth and Space Science
595 Circle Dr. E.
Los Angeles, CA 90024-1567
310-206-6459
310-825-2779 fax

Gary Fuis (fuis@andreas.wr.usgs.gov)
U.S. Geological Survey
345 Middlefield Rd.
Menlo Park, CA 94025
650-329-4758
650-329-5163 fax