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

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





Seismic + tsunami analysis code (Level-2) NIF run on positions + covs (McGuire & Segall, 2003) ComCot used to compute tsunami hydrodynamic GFs


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












GUI to interface with Level 1 & 2 data (GPS Cockpit)

GPS Cockpit: Time for a demo

Time series

Instantaneous Positions

Peak Ground Displacement

Megathrust Finite Faulting

Tsunami Height @ 50m

Documents

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