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Overview 1. (L1) Cascadia real-time GPS Station Network (PANGA + PBO) 2.(L2) GPS processing...
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Transcript of Overview 1. (L1) Cascadia real-time GPS Station Network (PANGA + PBO) 2.(L2) GPS processing...
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
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
SeattleM6-7 crustal
faults not well known, <1m
EEWM8-9: megathrust, <5m EEW
450 rtGPS stations: PANGA (~220) + PBO (~230)
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
Relative Positioning Absolute (Point) Positioning
(L2) Real-time processing strategies
Higher relative precision
Requires stable reference station
Requires dense network
Primarily commercial RTK
Lower absolute precision (improving)
Single station-capable
Linear wrt station #
Requires rt orbit + clock corrections
Requires extensive data editing
- (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
(Method 1) Trimble T4D operated jointly with WSRN & OGRN
Trimble T4D operated jointly with WSRN & OGRN
Method 2: JPL GDGPS RT-GIPSY SYSTEM (Bar-Sever)
Requires clock corrections streamed over Ntrip (DLR, IGS
Method 3: CWU short-arc real-time processing with GIPSY
IGS Final
Method 3: CWU real-time processing with GIPSY
Method 3: CWU real-time processing with GIPSY-Requires extensive phase-level data QC-Less than 5s latency
BREW
CNCR
CABL
TRND
CHZZ
~10cm deviations are common in all methods
2010 Maule Chile M8.8
Mike Bevis, UNAVCO
4. Example Earthquakes
2010 Maule: Absolute point positioning of CONZ
2010 Chile M8.8
east
north3
m
Sierra El Mayor, 4/4/2010
Good agreement between GPS PP and Accelerometer Data
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
pgDisplacement- 2010 Sierra El Mayor
GPS PGD Seismic PGA
2011 Tohoku-Oki Earthquake
GEONET GPS ARRAY
+15s:Seismic Detection
JMA: M6.8
NEIC W phase:M9.0~20 minutes
2011 Tohoku-Oki 3d GPS displacements (3x speed)
+60s: Mw 8.47
GPS Moment Estimate
+90s: Mw 8.80
GPS Moment Estimate
+120s: Mw 9.04
GPS Moment Estimate
+180s: Mw 9.05
GPS Moment Estimate
+15s:Seismic Detection
JMA: M6.8
NEIC W phase:M9.0~20 minutes
60s:M8.5 90s:M8.8 120s:M9.04
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
GPS Cockpit
DefMap Slip
GPS CockpitGPS Cockpit
GPS CockpitGPS Cockpit
Time for a demo!
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