Real-time GPS in Cascadia and its application to hazards reduction
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Real-time GPS in Cascadia and its application to hazards reduction
Pacific Northwest Geodetic ArrayDept. of Geological Sciences
Central Washington Universitywww.panga.org
Tim MelbourneMarcelo Santillan
Craig ScrivnerWalter Szeliga
CS481 Team Risc (GPS Cockpit)
Frank Webb (JPL)
Support: NASA ROSES NNH07ZDA001N and USGS NEHRP
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Overview1. (L1) Cascadia real-time GPS Station Network (PANGA + PBO)
2. (L2) GPS processing (phase+psuedorange data -> position estimates)
3. (L3) EEW products derived from rtGPS position streams
4. Example earthquakes as examples – 2010 Sierra El Mayor, 2010 Maule, 2011 Tohoku-Oki
5. GPS Cockpit Project: Managing rtGPS time series and derived products
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SeattleM6-7 crustal
faults not well known, <1m
EEWM8-9: megathrust, <5m EEW
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450 rtGPS stations: PANGA (~220) + PBO (~230)
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Latency: most data arrives in less than 1 secondPANGA telemetered to CWU
PBO telemetered to UNAVCO, then to CWU
Arrival at CWU Arrival at Boulder
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Relative Positioning Absolute (Point) Positioning(L2) Real-time processing strategies
Higher relative precisionRequires stable reference
stationRequires dense network
Primarily commercial RTK
Lower absolute precision (improving)
Single station-capableLinear wrt station #
Requires rt orbit + clock corrections
Requires extensive data editing
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- (1) Relative positioning: Trimble commercial product (joint w/ WSRN and OGRN RTK processing)
- (2) Real-time GIPSY Point positioning:
- (3) Developing standard GIPSY (not RTG) processing with clock and orbit correction streams from DLR (German Aerospace Center, Munich, Hauschild)
2. PANGA/CWU real-time processing
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(Method 1) Trimble T4D operated jointly with WSRN & OGRN
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Trimble T4D operated jointly with WSRN & OGRN
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Method 2: JPL GDGPS RT-GIPSY SYSTEM (Bar-Sever)
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Requires clock corrections streamed over Ntrip (DLR, IGS
Method 3: CWU short-arc real-time processing with GIPSY
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IGS Final
Method 3: CWU real-time processing with GIPSY
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Method 3: CWU real-time processing with GIPSY-Requires extensive phase-level data QC-Less than 5s latency
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BREW
CNCR
CABL
TRND
CHZZ
~10cm deviations are common in all methods
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2010 Maule Chile M8.8
Mike Bevis, UNAVCO
4. Example Earthquakes
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2010 Maule: Absolute point positioning of CONZ
2010 Chile M8.8
east
north3m
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Sierra El Mayor, 4/4/2010
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Good agreement between GPS PP and Accelerometer Data
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CWU, pp., 5 minutes
http://www.panga.cwu.edu/events/baja/
PBO, relative p., 24+24 hr
http://supersites.earthobservations.org/baja.php
Absolute vs. relative positioning
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pgDisplacement- 2010 Sierra El Mayor
GPS PGD Seismic PGA
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2011 Tohoku-Oki Earthquake
GEONET GPS ARRAY
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+15s:Seismic Detection
JMA: M6.8
NEIC W phase:M9.0~20 minutes
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2011 Tohoku-Oki 3d GPS displacements (3x speed)
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+60s: Mw 8.47
GPS Moment Estimate
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+90s: Mw 8.80
GPS Moment Estimate
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+120s: Mw 9.04
GPS Moment Estimate
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+180s: Mw 9.05
GPS Moment Estimate
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+15s:Seismic Detection
JMA: M6.8
NEIC W phase:M9.0~20 minutes
60s:M8.5 90s:M8.8 120s:M9.04
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5. GPS Cockpit
-Time Series viewer (interactive): negation of false positives-Data Aggregator (Perl, modular, talk to Craig Scrivner)-Many new derived products:
-DefMaps-Inversions-GPS ShakeCast
-Assimilation into seismic EEW not obvious
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GPS CockpitDefMap Slip
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GPS CockpitGPS Cockpit
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GPS CockpitGPS Cockpit
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Time for a demo!
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Conclusions1. Cascadia has mature real-time GPS networks (PANGA + PBO)
2. Data analysis is evolving rapidly
3. EEW products based on rtGPS position streams are also improving
4. Recent earthquakes show the importance of rtGPS in hazards monitoring
5. GPS Cockpit: First release on March 15