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Assorted innovations in earthquake early warning and rapid response. Sarah Minson. Why Assorted?. What we did Real-time inversion for finite fault slip models and rupture geometry based on high-rate GPS data Jessica Murray, John Langbein , Joan Gomberg Go see the poster! What we’re doing

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why assorted
Why Assorted?
  • What we did
    • Real-time inversion for finite fault slip models and rupture geometry based on high-rate GPS data
      • Jessica Murray, John Langbein, Joan Gomberg
      • Go see the poster!
  • What we’re doing
    • Crowd-sourced geodesy for earthquake hazard and process studies
      • USGS Innovation Center for Earth Sciences (ICES)
      • Benjamin Brooks, Jessica Murray, Carol Prentice (USGS), Bob Iannucci (CMU-SV)
    • GPU implementation of real-time finite fault inversion
      • ICES
      • Jessica Murray (USGS), Ole Mengshoel (CMU-SV)
    • Performance testing real-time finite fault inversions in Cascadia
      • David Schmidt (UW)
special thanks to brad aagaard yehuda bock brendan crowell asaf inbal hiroo kanamori and sue owen

Real-time inversion for finite fault slip models and rupture geometry based on high-rate GPS dataSarah E. Minson, Jessica R. Murray,John O. Langbein, Joan S. GombergUSGS Earthquake Science Center

Special Thanks to:

Brad Aagaard, Yehuda Bock, Brendan Crowell, AsafInbal, HirooKanamori, and Sue Owen

earthquake early warning eew
Earthquake Early Warning (EEW)
  • Use data from near an earthquake rupture to warn population centers at a distance that shaking is imminent
    • Information can be transmitted at the speed of light but strongest shaking is carried by waves traveling ~3.5 km/s
    • Warnings can be used not only to alert people but to prepare infrastructure
      • Slow BART trains
      • Open fire station doors
      • Bring elevators to nearest floor
earthquake studies
Earthquake studies
  • In real-time, determine basic information (location, magnitude)
  • Later, determine spatial distribution of slip
    • Involves 100s or 1,000s of free parameters in a highly under-determined and non-linear inverse problem
      • Really we want to do the full slip model in real-time
        • In real-time, missing basic information such as which fault is rupturing
solution
Solution
  • Solve for slip AND fault geometry using semi-analytical solution
slide7

Crowd-sourced geodesy for earthquake hazard and process studiesBenjamin Brooks1, Jessica Murray1, Sarah Minson1Carol Prentice1, Bob Iannucci21USGS Earthquake Science Center2Carnegie Mellon University - Silicon Valley

ICES

introduction
Introduction
  • Real-time high-rate scientific-quality GPS data is proving to be very valuable for EEW and rapid response
    • Very limited global distribution
  • Low quality GPS receivers are globally ubiquitous
    • Smartphones
    • GPS navigation in cars
  • Can supplement with low-cost community instruments (LCCIs)
      • Quake Catcher Network
challenges
Challenges
  • Huge errors associated with pseudorange-based GPS locations
  • Even huger errors associated with attaching GPS to humans
  • Communications issues
  • Data volume could be enormous
caveat
Caveat
  • This is an altruistic EEW system
    • Normally we use instruments near the source to warn humans at a distance
    • Here we use instruments attached to humans near the source to warn humans at a distance
to do
To-Do
  • Fit displacement amplitudes
  • Earthquake location and Mw
  • Data resampling
  • Focal mechanism
  • Slip modeling
  • Detection?
  • Quality control?
  • e.g., Scripps group
  • Reuse real-time finite fault inversion

Northing

Easting

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