Fault Slip Sensors and DamageMap: GPS in Rapid Earthquake Response Systems

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Fault Slip Sensorsand DamageMapGPS in Rapid
EarthquakeResponse Systems

• Ken Hudnut
• USGS, Pasadena

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San Andreas fault

• 35 mm/yr slip rate
• gt70 of plate motion
• 1685, 1857 eqs
• 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

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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
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San Andreas - place two betsboth 120 km from
Los Angeles (LA)
Coachella Valley segment is 60 km to San
Bernardino
L A
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San Andreas - instrument majorlifeline
infrastructure crossings
L A
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Courtesy of Erdal Safak (USGS)
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Factor Building at UCLAPrototype for DamageMap
PIs Erdal Safak, Monical Kohler and Paul Davis
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Another technological advancefor rapid
earthquakeinformation 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
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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 - dont 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 RD 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