Mathematics – Logic
Scientific paper
Apr 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995georl..22..759s&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 22, no. 7, p. 759-762
Mathematics
Logic
7
California, Earthquakes, Long Term Effects, Monitors, Shear Strain, Creep Analysis, Geological Surveys, Global Positioning System, Seismic Waves
Scientific paper
Frequent measurements since mid-1981 of the distances from a geodetic monument located about 100 km south-southeast of San Francisco to three monuments 30 to 40 km distant provide an unusually complete record of the deformation before and after two nearby earthquakes, the 1984 Morgan Hill (M(sub L) = 6.2) and 1989 Loma Prieta (M(sub s) = 7.1) earthquakes. Except possibly for the first few months postseismic, the extension rates indicated by these measurements appear to be steady over the four or five years preceding and following those earthquakes. However, the preseismic and postseismic rates differ significantly for at least one of the baselines measured for each earthquake. The data over the four to five year postseismic records available are not adequate to demonstrate whether the postseismic rates are relaxing back to the preseismic rates.
Lisowski Michael
Savage Christopher J.
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