Cascadia Megathrust Pacific Northwest Geodetic Array Dept of Geological Sciences Central Washington University wwwpangaorg Sergio Abundiz Elyse Frohling Timothy Melbourne Victor Marcelo ID: 295451
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READI for the Cascadia Megathrust
Pacific Northwest Geodetic ArrayDept. of Geological SciencesCentral Washington Universitywww.panga.org
Sergio AbundizElyse FrohlingTimothy MelbourneVictor Marcelo SantillanCraig ScrivnerWalter SzeligaFrank Webb (JPL)
Supported by NASA ROSES-
NNX10AD15G
(with additional support
from the
Moore Foundation & USGS ARRA IPA)Slide2
March 11 M9.0 Tohoku EarthquakeSlide3
470 Cascadia
rtGPS
1000 Japanese rtGPSSlide4
+60s: Mw 8.47
GPS can rapidly
constrain moment+90s: Mw 8.80+120s: Mw 9.04Slide5
Tohoku in
Cascadia
No stable reference station in a 2-state radius!USGS, M9, 30m max slipSlide6
READI Data ProductsLevel-0: Phase and range data delivered in real-time
Level-1: Point-position + cov time series delivered in real-time (also tropospheric PWV and ionospheric TEC)Level-2: Seismic source estimates delivered in real-timeLevel-3: rtGPS-derived products and positions integrated into seismic and other monitoring systemsSlide7
CWU’s READI System
Telemetry hub + archive for all 470 PANGA + PBO sites (Level-0 data product)Real-time PPP system (Level-1)Seismic + tsunami analysis code (Level-2)Database to receive and distribute position time series and derived Level 2 data productsGUI to interface with the Level 1 & 2 data (GPS Cockpit)Slide8
PPP with RTSE & GIPSY 6.2
Real-time Stream Editor precleans phase & range dataUses geometry-free linear combination to flag and fix slips & biasesTakes into account different weighting for different observationsStable, lightweight 5-state Kalman filter processing per satelliteFacilitates parallel processingFast convergence and re-convergences < 1 min at 1 Hz
Provides ionospheric delay as a byproductPhysical models (tides, ocean loading, phase windup, relativistic effects ) are predicted and applied as corrections to Level-0 data to improve accuracy and help to reduce convergence time.Concurrent GIPSY runs on 20-epoch arcs, last five epochs shunted into rt streamsRun-time is under 0.5 second (w/ smapper.small.e)GIPSY’s models are excellent (truth)Slide9
RTSE post-processing results using GOA 6.1.2
P494 Sierra El Mayor Earthquake 7.1 Mw 04/04/2010 Slide10
CWU’s READI System
Telemetry hub + archive for all 470 PANGA + PBO sites (Level-0 data product)Real-time PPP system (Level-1)Database to receive and distribute position time series and derived Level 2 data productsSeismic + tsunami analysis code (Level-2)NIF run on positions + covs (McGuire & Segall, 2003)
ComCot used to compute tsunami hydrodynamic GFsGUI to interface with the Level 1 & 2 data (GPS Cockpit)Slide11
Level-1 & Level-2 database & client request system
Accept
rtGPS solutions from various sources, in various formatsSQL-Server based Up to 24 hrs of data held in multiple buffers & sample ratesLevel-1 & 2 products streamed on a client request basisUses HTTP, JSON and BSON formats to serve data to clientsWell-documented APISlide12
CWU’s READI System
Telemetry hub + archive for all 470 PANGA + PBO sites (Level-0 data product)Real-time PPP system (Level-1)Database to receive and distribute position time series and derived Level 2 data productsSeismic + tsunami analysis code (Level-2)NIF run on positions + covs (McGuire &
Segall, 2003)ComCot used to compute tsunami hydrodynamic GFsGUI to interface with the Level 1 & 2 data (GPS Cockpit)Slide13
CWU’s READI System
Telemetry hub + archive for all 470 PANGA + PBO sites (Level-0 data product)Real-time PPP system (Level-1)Database to receive and distribute position time series and derived Level 2 data productsSeismic + tsunami analysis code (Level-2)NIF run on positions + covs (McGuire & Segall, 2003)
ComCot used to compute tsunami hydrodynamic GFsGUI to interface with Level 1 & 2 data (GPS Cockpit)Slide14
GPS Cockpit: Time for a demoSlide15
Time seriesSlide16
Instantaneous PositionsSlide17
Peak Ground DisplacementSlide18
Megathrust
Finite FaultingSlide19
Tsunami Height @ 50mSlide20