Southern California Permanent GPS Geodetic Array

Spatial filtering of daily positions for estimating coseismic and postseismic displacements induced by the 1992 Landers earthquake

Shimon Wdowinski, Yehuda Bock, Jie Zhang, Peng Fang, Joachim Genrich

Research output: Contribution to journalArticle

289 Citations (Scopus)

Abstract

The June 28, 1992 (Mw=7.3) Landers, California, earthquake was the first earthquake to be surveyed by a continuously operating Global Positioning System (GPS) array. The coordinate time series of seven sites are evaluated for station displacements during an interval of 100 days centered on the day of the earthquake. We employ a new spatial filtering technique that removes common-mode errors from the coordinate time series. This approach provides precise estimates of site-specific displacements compared to the cumbersome method of analyzing baselines between pairs of stations. All sites indicate significant coseismic horizontal displacements of 5-65 mm with uncertainties of 1-2 mm. Horizontal displacements are in general agreement with elastic dislocation models, in particular for sites closer to the epicenter. Vertical displacements range from -13 to +7 mm with uncertainties of 2-4 mm. The observed vertical displacements in all cases show 5-10 mm more subsidence than expected from geodetic and seismic/geologic models. Significant postseismic horizontal displacements totaling 6±2 mm (10-20% of the coseismic displacement) are detected at the three sites closest to the epicenter. These displacements are modeled as a short-term exponential relaxation with a decay time of 22±10 days superimposed on a longer-term linear interseismic trend. Scaling the observed coseismic and postseismic displacements at one of the sites with the distance to the epicenter provides a measure of site strain, which agrees well with the direction and magnitude determined from more precise laser strain meter data. The time series do not show any detectable preseismic displacements.

Original languageEnglish (US)
Pages (from-to)18057-18070
Number of pages14
JournalJournal of Geophysical Research C: Oceans
Volume102
Issue numberB8
StatePublished - Aug 10 1997
Externally publishedYes

Fingerprint

Landers earthquake 1992
Southern California
spatial filtering
Global Positioning System
Global positioning system
Time series
Earthquakes
estimating
GPS
earthquakes
Geologic models
Subsidence
earthquake epicenter
Lasers
time series
earthquake
stations
subsidence
Uncertainty
dislocation

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)
  • Earth and Planetary Sciences (miscellaneous)
  • Atmospheric Science
  • Geochemistry and Petrology
  • Geophysics
  • Oceanography
  • Space and Planetary Science
  • Environmental Science(all)
  • Astronomy and Astrophysics

Cite this

Southern California Permanent GPS Geodetic Array : Spatial filtering of daily positions for estimating coseismic and postseismic displacements induced by the 1992 Landers earthquake. / Wdowinski, Shimon; Bock, Yehuda; Zhang, Jie; Fang, Peng; Genrich, Joachim.

In: Journal of Geophysical Research C: Oceans, Vol. 102, No. B8, 10.08.1997, p. 18057-18070.

Research output: Contribution to journalArticle

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