READI for the Cascadia Megathrust Pacific Northwest Geodetic Array Dept. of Geological Sciences Central Washington University www.panga.org Sergio Abundiz Elyse Frohling Timothy Melbourne Victor Marcelo Santillan Craig Scrivner Walter Szeliga Frank Webb (JPL) Supported by NASA ROSES-NNX10AD15G (with additional support from the Moore Foundation & USGS ARRA IPA)
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March 11 M9.0 Tohoku Earthquake +60s: Mw 8.47 GPS can rapidly constrain momentGPS can rapidly constrain moment +90s: Mw 8.80 +120s: Mw 9.04.
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READI for the Cascadia Megathrust
Pacific Northwest Geodetic ArrayDept. of Geological Sciences
Central Washington Universitywww.panga.org
Sergio AbundizElyse Frohling
Timothy MelbourneVictor Marcelo Santillan
Craig ScrivnerWalter Szeliga
Frank Webb (JPL)
Supported by NASA ROSES-NNX10AD15G (with additional support from the Moore Foundation & USGS ARRA IPA)
March 11 M9.0 Tohoku Earthquake
470 Cascadia rtGPS1000 Japanese rtGPS
+60s: Mw 8.47
GPS can rapidly constrain moment
+90s: Mw 8.80
+120s: Mw 9.04
Tohoku in Cascadia
No stable reference station in a 2-state radius!
USGS, M9, 30m max slip
READI Data Products
Level-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-time
Level-3: rtGPS-derived products and positions integrated into seismic and other monitoring systems
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 products
GUI to interface with the Level 1 & 2 data (GPS Cockpit)
PPP with RTSE & GIPSY 6.2
Real-time Stream Editor precleans phase & range data Uses geometry-free linear combination to flag and fix slips & biases Takes into account different weighting for different observations Stable, lightweight 5-state Kalman filter processing per satellite Facilitates parallel processing Fast convergence and re-convergences < 1 min at 1 Hz Provides ionospheric delay as a byproduct Physical 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 streams Run-time is under 0.5 second (w/ smapper.small.e) GIPSY’s models are excellent (truth)
RTSE post-processing results using GOA 6.1.2
P494 Sierra El Mayor Earthquake 7.1 Mw 04/04/2010
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 products
Seismic + tsunami analysis code (Level-2) NIF run on positions + covs (McGuire & Segall, 2003) ComCot used to compute tsunami hydrodynamic GFs
GUI to interface with the Level 1 & 2 data (GPS Cockpit)
Level-1 & Level-2 database & client request system
Accept rtGPS solutions from various sources, in various formats
SQL-Server based
Up to 24 hrs of data held in multiple buffers & sample rates
Level-1 & 2 products streamed on a client request basis
Uses HTTP, JSON and BSON formats to serve data to clients
Well-documented API
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 products
Seismic + tsunami analysis code (Level-2) NIF run on positions + covs (McGuire & Segall, 2003) ComCot used to compute tsunami hydrodynamic GFs
GUI to interface with the Level 1 & 2 data (GPS Cockpit)
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 products
Seismic + tsunami analysis code (Level-2) NIF run on positions + covs (McGuire & Segall, 2003) ComCot used to compute tsunami hydrodynamic GFs
GUI to interface with Level 1 & 2 data (GPS Cockpit)