Physics
Scientific paper
Jan 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998georl..25...93h&link_type=abstract
Geophysical Research Letters, Volume 25, Issue 1, p. 93-96
Physics
7
Geodesy And Gravity: Seismic Deformations, Seismology: Continental Crust, Seismology: Seismic Hazard Assessment And Prediction, Tectonophysics: Plate Boundary-General
Scientific paper
Geodetic time series determined with the Global Positioning System indicate that the geodetic rate of a permanent site in Pasadena, California (JPLM) changed significantly after the 17 January 1994 Northridge California earthquake. Subtracting the pre-quake rate and co-seismic offset leaves 30+/-4mm of integrated eastward excess motion observed in the three years following the earthquake. North and vertical components show excess motion of -11+/-3mm and 25+/-11mm respectively. Local surveys to three additional points near JPLM changed by no more than 6 mm E, 3 mm N, and 15 mm V during the two years after the earthquake, ruling out the possibility of a local effect at the JPLM monument. The direction and size of the post-seismic displacements at JPLM are not consistent with additional slip on the fault which ruptured. The most rapid accumulation of excess motion occurs immediately after the earthquake, suggesting a relationship between the two events.
Dauger Deborah
Dong Danan
Donnellan Andrea
Heflin Michael
Hurst Ken
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