1. Evaluation of transient deformation from continuous GPS time series in Western North America ( )
Yehuda Bock1, Brendan W. Crowell 1, Danan Dong 2, Peng Fang1, Sharon Kedar 2, Zhen Liu 2, Angelyn W. Moore 2, Susan E. Owen 2, Linette M. Prawirodirdjo1, Melinda B. Squibb1, Frank Webb 2
1 Cecil H. and Ida M. Green Institute of Geophysics and Planetary Physics, Scripps Institution of Oceanography, La Jolla, CA
2 Jet Propulsion Laboratory, Caltech, Pasadena, CA
G53C. New Science Results From the
EarthScope Plate Boundary Observatory II
AGU Fall Meeting, San Francisco
December 9, 2011

2. Solid Earth Science ESDR System
PI’s: Frank Webb (JPL) and Yehuda Bock (SIO)
Goal:
Support Earth Surface and Interiors (ESI) science goals by providing mature, long-term surface deformation Earth Science Data Records (ESDRs) for understanding earthquakes and the processes that drive tectonic motion
Objectives:
Deliver verified and validated GPS data products through a portal that facilitates data exploration
NASA Contribution to EarthScope
Key Innovations:
Web portal technology for data exploration
Verified and validated high-level surface deformation data sets for studying tectonic motions
Workflow that integrates high-level data products with modeling tools

3. Summary Description of Data & Metadata
Hierarchy of Earth Science Data Records
GPS Analysis
(JPL GIPSY & SOPAC GAMIT)
Time Series
(Independent, Combined, Precision & Accuracy, Quality Control)
Tectonic Deformation – Linear & Transient
(Velocities, Coseismic, Postseismic, Strain, Slow slip)
Non-Tectonic Effects
(Magmatic, Hydrologic, Anthropogenic sources, Structural)
Interactive Data Portal – GPS Explorer
(Map Interface, Time Series Java Applet, Time Series Modeling Tool, Strain, Transient Deformation)

4. Data & Metadata
Data (RINEX files) archived at SOPAC from > 1800 stations in Western North America including all PBO, SCIGN, BARD and PANGA stations
Earliest solutions are from 1992, combination solutions from 1995
Use a common source of metadata to reduce systematic errors – available publically in XML and “IGS log file” formats
Processed independently at JPL (GIPSY) and SOPAC (GAMIT)
Increase the font size 4

5. Hierarchy of Earth Science Data Records
SOPAC Archive
Hierarchy of Earth Science Data Records
Larger type 5

6. Independent SOPAC and JPL analysis
SOPAC – cluster approach, divide into global and regional subnetworks and produce loosely constrained GAMIT h- files after ambiguity resolution
JPL: Precise Point Positioning and ambiguity resolution, aligned to SOPAC realization of global reference frame (ITRF2005, transitioning to ITRF2008), produce loosely-constrained GIPSY STACOV files

7. Time Series Data Products & Java Applet (***update)
Available Time series:
JPL
SOPAC
Combined JPL & SOPAC
PBO
Can view:
Raw or modeled time series
Residuals
Unfiltered or filtered
April 21, 2018

8. PCA Analysis (***modify this to describe the PCA and overall procedure that we use)

9. Significant Earthquakes in Western N.A.
( *** complete this table)

10. Time Series Modeling

11. Transient Deformation Southern SAF Region

12. Sep 2, 2005 Mw 5.1 Obsidian Buttes Seismic Swarm
DHLG
Sep 2, 2005 Mw 5.1 Obsidian Buttes Seismic Swarm
(CRRS,DHLG,GLRS)
GLRS
Apr 4, 2010 Mw 7.2 El Mayor-Cucapah Earthquake
(209 stations)
Jun 15, 2010 Mw 5.7 Ocotillo El Mayor-Cucapah Aftershock
(7 stations)
Jul 7, 2010 Mw 5.4 Borrego Springs (P484&P490)

13. Sep 2, 2005 Mw 5.1 Obsidian Buttes Seismic Swarm
DHLG
Sep 2, 2005 Mw 5.1 Obsidian Buttes Seismic Swarm
(CRRS,DHLG,GLRS)
GLRS
Apr 4, 2010 Mw 7.2 El Mayor-Cucapah Earthquake
(209 stations)
Jun 15, 2010 Mw 5.7 Ocotillo El Mayor-Cucapah Aftershock
(7 stations)
Jul 7, 2010 Mw 5.4 Borrego Springs (P484&P490)

14. Sep 2, 2005 Mw 5.1 Obsidian Buttes Seismic Swarm
DHLG
Sep 2, 2005 Mw 5.1 Obsidian Buttes Seismic Swarm
(CRRS,DHLG,GLRS)
GLRS
Apr 4, 2010 Mw 7.2 El Mayor-Cucapah Earthquake
(209 stations)
Jun 15, 2010 Mw 5.7 Ocotillo El Mayor-Cucapah Aftershock
(7 stations)
Jul 7, 2010 Mw 5.4 Borrego Springs (P484&P490)

15. Sep 2, 2005 Mw 5.1 Obsidian Buttes Seismic Swarm
DHLG
Sep 2, 2005 Mw 5.1 Obsidian Buttes Seismic Swarm
(CRRS,DHLG,GLRS)
GLRS
Apr 4, 2010 Mw 7.2 El Mayor-Cucapah Earthquake
(209 stations)
Jun 15, 2010 Mw 5.7 Ocotillo El Mayor-Cucapah Aftershock
(7 stations)
Jul 7, 2010 Mw 5.4 Borrego Springs (P484&P490)

16. DHLG
Velocity uncertainty ~ 0.03 mm/yr
GLRS
RMS ~ 0.8 mm
CRRS
RMS ~ 1.1 mm
Velocity uncertainty ~ 0.04 mm/yr
RMS ~ 2.7 mm
Velocity uncertainty ~ 0.08 mm/yr

17. Transient Deformation (Salton Trough 1996-2011)
Antenna Change at DHLG
ITRF2005 to ITRF2008 transition
DHLG
GLRS
CRRS
Oct 16, 1999 Mw 7.1 Hector Mine Earthquake
Postseismic:
3-D Exponential Decay
; tau = 182 days
Apr 4, 2010 Mw 7.2 El Mayor-Cucapah Earthquake +
Postseismic:
3-D Exponential Decay
tau = 173 days
Sep 2, 2005 Mw 5.1 Obsidian Buttes Seismic Swarm

18. Transient Deformation Central California
Sep 28, 2004 Mw 6.0 Parkfield Earthquake
(28 stations)
Dec 23, 2003 Mw 6.5 San Simeon Earthquake
(23 stations)

19. Transient Deformation Central California (***fill in details)

20. Transient Deformation Central California

21. Anomalies (Site POMM near SAF)
SOPAC
JPL

22. Comparison (Site HUNT near SAF)

23. Vertical Deformation: Mendocino Triple Junction (***add slides)

24. Non-Tectonic Effects (***modify with other examples)
LBC1: Oil Extraction
CASA: Magma

25. Subsidence in the Central Valley
Los Banos-Kettleman
Tulare-Wasco
Arvin-Maricopa

26. Central Valley: Up Residuals

27. Transient Deformation & Strain Map from Sharon/Robert

28. Strain evolution (GPS Explorer strain movie)

29. GPS Explorer Demo (movie here – probably not for this talk)

30. Access to GPS Explorer http://geoapp03.ucsd.edu/gridsphere/gridsphere30