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Overview 1. (L1) Cascadia real-time GPS Station Network (PANGA + PBO) 2.(L2) GPS processing (phase+psuedorange data -> position estimates) 3.(L3) EEW.

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Presentation on theme: "Overview 1. (L1) Cascadia real-time GPS Station Network (PANGA + PBO) 2.(L2) GPS processing (phase+psuedorange data -> position estimates) 3.(L3) EEW."— Presentation transcript:

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2 Overview 1. (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

3 Seattle M6-7 crustal faults not well known, <1m EEW M8-9: megathrust, <5m EEW

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5 Latency: most data arrives in less than 1 second PANGA telemetered to CWU PBO telemetered to UNAVCO, then to CWU Arrival at CWUArrival at Boulder

6 Relative Positioning Absolute (Point) Positioning 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

7 -(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)

8 (Method 1) Trimble T4D operated jointly with WSRN & OGRN

9 Trimble T4D operated jointly with WSRN & OGRN

10 Method 2: JPL GDGPS RT-GIPSY SYSTEM (Bar-Sever)

11 Requires clock corrections streamed over Ntrip (DLR, IGS Method 3: CWU short-arc real-time processing with GIPSY

12 IGS Final Method 3: CWU real-time processing with GIPSY

13 -Requires extensive phase-level data QC -Less than 5s latency

14 BREW CNCR CABL TRND CHZZ ~10cm deviations are common in all methods

15 2010 Maule Chile M8.8 Mike Bevis, UNAVCO 4. Example Earthquakes

16 2010 Maule: Absolute point positioning of CONZ2010 Maule: Absolute point positioning of CONZ east north 3m

17 Sierra El Mayor, 4/4/2010Sierra El Mayor, 4/4/2010

18 Good agreement between GPS PP and Accelerometer Data

19 CWU, pp., 5 minutes PBO, relative p., hr Absolute vs. relative positioning

20 pgDisplacement Sierra El MayorpgDisplacement Sierra El Mayor GPS PGDSeismic PGA

21 2011 Tohoku-Oki Earthquake GEONET GPS ARRAY

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24 +15s: Seismic Detection NEIC W phase: M9.0 ~20 minutes

25 2011 Tohoku-Oki 3d GPS displacements (3x speed)2011 Tohoku-Oki 3d GPS displacements (3x speed)

26 +60s: Mw 8.47 GPS Moment Estimate

27 +90s: Mw 8.80 GPS Moment Estimate

28 +120s: Mw 9.04 GPS Moment Estimate

29 +180s: Mw 9.05 GPS Moment Estimate

30 +15s: Seismic Detection NEIC W phase: M9.0 ~20 minutes 60s:M8.590s:M8.8120s:M9.04

31 -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

32 GPS Cockpit DefMap Slip

33 GPS Cockpit

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35 Time for a demo!

36 Conclusions 1. 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


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