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Title: Interseismic Ground Deformation and Fault Slip Rates in the Greater San Francisco Bay Area From Two Decades of Space Geodetic Data

Abstract

The detailed spatial variations of strain accumulation and creep on major faults in the northern San Francisco Bay Area (North Bay), which are important for seismic potential and evaluation of natural hazards, remain poorly understood. We combine interferometric synthetic aperture radar data from the ERS-1/2 and Envisat satellites between 1992 and 2010 with continuous and campaign GPS data to obtain a high spatial and temporal coverage of ground deformation of the North Bay. The SAR data from both ascending and descending orbits are combined to separate horizontal and vertical components of the deformation. We jointly invert the horizontal component of the mean velocities derived from these data to infer the deep strike-slip rates on major locked faults. We use the estimated deep rates to simulate the long-wavelength deformation due to interseismic elastic strain accumulation along these locked faults. After removing the long-wavelength signal from the InSAR horizontal mean velocity field, we estimate fault-parallel surface creep rates of up to 2 mm/year along the central section of the Rodgers Creek fault and surface creep rates ranging between 2 and 4 mm/year along the Concord fault. No surface creep is geodetically resolved along the West Napa and Green Valley fault zones. Wemore » identified characteristically repeating earthquakes on the Rodgers Creek fault, the West Napa fault, the Green Valley fault, and the Concord fault. Finally, nontectonic deformation in the Geysers geothermal field and in Late Cenozoic basins (Rohnert Park and Sonoma basins) are also observed, likely due to hydrological and sediment-compaction processes, respectively.« less

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [3]; ORCiD logo [4]; ORCiD logo [5]; ORCiD logo [6]; ORCiD logo [3]; ORCiD logo [7];  [2]; ORCiD logo [3]
  1. The Hong Kong Polytechnic Univ. (China). Dept. of Land Surveying and Geo-Informatics; Univ. of California, Berkeley, CA (United States). Berkeley Seismological Lab. Dept. of Earth and Planetary Science
  2. The Hong Kong Polytechnic Univ. (China). Dept. of Land Surveying and Geo-Informatics
  3. Univ. of California, Berkeley, CA (United States). Berkeley Seismological Lab. Dept. of Earth and Planetary Science
  4. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Dept. of Earth, Atmospheric and Planetary Sciences
  5. Univ. of California, Riverside, CA (United States). Dept. of Earth Sciences
  6. Univ. at Buffalo, NY (United States). Dept. of Geology
  7. U.S. Geological Survey, Menlo Park, CA (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE; United States Geological Survey (USGS); The Hong Kong Polytechnic Univ. (China); Hong Kong Research Grants Council (China)
OSTI Identifier:
1479377
Grant/Contract Number:  
AC02-05CH11231; G16AP00007; 1-ZE6R; F-PP4B
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Geophysical Research. Solid Earth
Additional Journal Information:
Journal Volume: 123; Journal Issue: 9; Journal ID: ISSN 2169-9313
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES

Citation Formats

Xu, Wenbin, Wu, Songbo, Materna, Kathryn, Nadeau, Robert, Floyd, Michael, Funning, Gareth, Chaussard, Estelle, Johnson, Christopher W., Murray, Jessica R., Ding, Xiaoli, and Bürgmann, Roland. Interseismic Ground Deformation and Fault Slip Rates in the Greater San Francisco Bay Area From Two Decades of Space Geodetic Data. United States: N. p., 2018. Web. doi:10.1029/2018JB016004.
Xu, Wenbin, Wu, Songbo, Materna, Kathryn, Nadeau, Robert, Floyd, Michael, Funning, Gareth, Chaussard, Estelle, Johnson, Christopher W., Murray, Jessica R., Ding, Xiaoli, & Bürgmann, Roland. Interseismic Ground Deformation and Fault Slip Rates in the Greater San Francisco Bay Area From Two Decades of Space Geodetic Data. United States. doi:10.1029/2018JB016004.
Xu, Wenbin, Wu, Songbo, Materna, Kathryn, Nadeau, Robert, Floyd, Michael, Funning, Gareth, Chaussard, Estelle, Johnson, Christopher W., Murray, Jessica R., Ding, Xiaoli, and Bürgmann, Roland. Wed . "Interseismic Ground Deformation and Fault Slip Rates in the Greater San Francisco Bay Area From Two Decades of Space Geodetic Data". United States. doi:10.1029/2018JB016004. https://www.osti.gov/servlets/purl/1479377.
@article{osti_1479377,
title = {Interseismic Ground Deformation and Fault Slip Rates in the Greater San Francisco Bay Area From Two Decades of Space Geodetic Data},
author = {Xu, Wenbin and Wu, Songbo and Materna, Kathryn and Nadeau, Robert and Floyd, Michael and Funning, Gareth and Chaussard, Estelle and Johnson, Christopher W. and Murray, Jessica R. and Ding, Xiaoli and Bürgmann, Roland},
abstractNote = {The detailed spatial variations of strain accumulation and creep on major faults in the northern San Francisco Bay Area (North Bay), which are important for seismic potential and evaluation of natural hazards, remain poorly understood. We combine interferometric synthetic aperture radar data from the ERS-1/2 and Envisat satellites between 1992 and 2010 with continuous and campaign GPS data to obtain a high spatial and temporal coverage of ground deformation of the North Bay. The SAR data from both ascending and descending orbits are combined to separate horizontal and vertical components of the deformation. We jointly invert the horizontal component of the mean velocities derived from these data to infer the deep strike-slip rates on major locked faults. We use the estimated deep rates to simulate the long-wavelength deformation due to interseismic elastic strain accumulation along these locked faults. After removing the long-wavelength signal from the InSAR horizontal mean velocity field, we estimate fault-parallel surface creep rates of up to 2 mm/year along the central section of the Rodgers Creek fault and surface creep rates ranging between 2 and 4 mm/year along the Concord fault. No surface creep is geodetically resolved along the West Napa and Green Valley fault zones. We identified characteristically repeating earthquakes on the Rodgers Creek fault, the West Napa fault, the Green Valley fault, and the Concord fault. Finally, nontectonic deformation in the Geysers geothermal field and in Late Cenozoic basins (Rohnert Park and Sonoma basins) are also observed, likely due to hydrological and sediment-compaction processes, respectively.},
doi = {10.1029/2018JB016004},
journal = {Journal of Geophysical Research. Solid Earth},
number = 9,
volume = 123,
place = {United States},
year = {2018},
month = {8}
}

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