1. Fault Slip Sensors and DamageMap: GPS in Rapid Earthquake Response Systems Ken Hudnut USGS, Pasadena

2. San Andreas fault  35 mm/yr slip rate;  >70% of plate motion  1685, 1857 eq’s  SoCal is now well ‘wired’  Likely source of most future ‘Big Ones’  Fault physics experiment  GPS/INS in near-field  ALSM & DG scan ‘net’  Great place to test EEW  Build “zipper” arrays  Cholame - Simmler  Coachella Valley

4. Lone Juniper Ranch and Frazier Park High School First prototype GPS fault slip sensor; up to 10 Hz (Hudnut et al., 2002) Spans the San Andreas fault near Gorman, California

5. San Andreas - place two bets both ~120 km from Los Angeles (LA) Coachella Valley segment is ~60 km to San Bernardino

6. San Andreas - instrument major lifeline infrastructure crossings

7. Courtesy of Erdal Safak (USGS)

8. Factor Building at UCLA Prototype for DamageMap PI’s Erdal Safak, Monical Kohler and Paul Davis

9. Another technological advance for rapid earthquake information message delivery Cell phones with GPS open possibility of ‘smart’ SMS real-time warning targeted to at-risk mobile users (outdoors) or mobile platforms (e.g., while in their cars) [currently not feasible due to power requirements, if GPS is on all the time] Maps2ME FutureRoads

10. Summary  Slip sensor concept is to augment regional seismic coverage - one part of an overall EEW system that is primarily using a very different approach  Measure slip directly - don’t need to know anything else - ‘quick & easy’  High risk deployment strategy tuned to rare pay-off in extreme events  Robust earthquake early warning system design  obtain more accurate displacement observations  new instrumentation for dynamic and static displacement address deficiencies due to double-integration of accelerometer records  Same R&D effort as for DamageMap instrumentation - now under way with USGS Venture Capital and ANSS start-up funds, but major funding and long-term support for implementation has not yet been identified