SCIGN Network Design Re-evaluation Workshop

DATE: May 15-16, 1997

LOCATION: Scripps Institution of Oceanography, UCSD, San Diego, CA

CONVENORS: Yehuda Bock - UCSD, Andrea Donnellan - JPL

BACKGROUND

Following the 1994 Northridge earthquake, the SCEC Crustal Deformation Working Group proposed the implementation of a 250 station continuous GPS network in southern California. A first workshop, held in September of 1994, discussed the pros and cons of a continuous network and other issues surrounding continuous GPS networks. A second workshop, held in March of 1995, led to a network design. The network design includes three north-south trending profiles with ense station spacing that span the Los Angeles and Ventura basins. Regional scattered stations fill in the rest of southern California. In the current network configuration 105 stations make up the profiles and the remaining 145 stations are disbursed throughout the regional subnetworks.

Approximately $14M has been raised for the network since the March 1995 workshop. 40 stations are currently in operation and the current funds allow for approximately 200 more stations. The approximate locations of the next 100 stations have been selected following the guidelines of the SCIGN network map from the March 1995 workshop.

May 15-16 GPS Network Design Workshop

The SCIGN coordinating board recommends a re-evaluation of the network design at this time in order to ensure that the most science be achieved with the 250 stations. A workshop will be held on May 15-16 at the Scripps Institution of Oceanography to revisit the network design and associated issues

The workshop will consist of background talks, position papers, and discussion of the network design. If you plan to submit a position paper please do so. It need not be longer than a page with a figure. To get a copy of the original network map contact Andrea Donnellan at andrea@cobra.jpl.nasa.gov. To get a copy of the planned 100 stations contact Ken Hudnut at hudnut@gps.caltech.edu.

SCHEDULE

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THURSDAY, MAY 15, 1997

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BACKGROUND TALKS:

1:00-1:20 SCIGN Status Report- Yehuda Bock, UCSD, Chair SCIGN Coordinating Committee

1:10-1:40 Review of SCIGN Network Design to Date - Frank Webb, JPL (Dots III chair)

1:40-2:00 Geology of the Los Angeles Basin (and thin-skinned versus thick-skinned models?) - Tom Rockwell, San Diego State University

2:00-2:20 Existing Geodetic Results from the Area - Zhen-Kang Shen, UCLA

2:20-2:40 Modeling Resolution of Continuous GPS Data - Paul Segal, Stanford

2:40-3:00 Recent Modeling of GPS Data - Brad Hager, MIT

3:00-3:20 Break

3:20-3:40 Seismicity of the Los Angeles Basin - Lucy Jones, USGS Pasadena

3:40-4:00 Recent Results from LARSE - Rob Clayton or Tom Henyey

4:00-4:20 Leveling Results for the Ventura Basin - Art Sylvester, UC Santa Barbara

4:20-4:40 Status of the Los Angeles Area Borehole Strain Instruments - Malcom Johnston, USGS Menlo Park

4:40-5:00 Use of SAR for Tectonic Studies in the Los Angeles Region - Gilles Peltzer, JPL and Wayne Thatcher, USGS Menlo Park

5:00 Refreshments

6:00 Dinner

8:00 (or so) SCIGN Meeting to discuss current site upgrades

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FRIDAY, MAY 16, 1997 9:00-4:00

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MORNING SESSION

Position Papers (10 minutes each)

8:30 GPS Profiles -- Will Prescott, USGS Menlo Park

8:40 GPS Network Design -- Hadley Johnson, Scripps

8:50 Subnetworks (Focus Areas) -- Dave Jackson, UCLA/SCEC

9:00 Laser Strainmeter Array -- Duncan Agnew, Scripps

9:10 Post-Landers INSAR Results -- Dave Sandwell, Scripps

9:20 GPS/INSAR Integration -- Simon Williams, Scripps

9:30 Sites in Baja California -- Javier Gonzalez-Garcia

9:40 Break

10:00 Discussion -- Network Map Re-evaluation and Finalization

Chaired by Frank Webb (Chair Dots III committee)

12:00 Lunch

AFTERNOON SESSION

13:00 (or so) SCIGN Coordinating Board Meeting (Open)

Agenda: Finalize network design guidelines