Article Abstract:
Seismic shifts occurring before, during and after two earthquakes in southern California were examined using the International Global Positioning System and Geodynamics Service. The first quake occurred near Landers, CA on Jun 28, 1992 followed three hours later by the second quake near Big Bear, CA. The resulting data increased geodetic knowledge of the Johnson Valley and Camp Rock/Emerson faults. In particular, the rupture between the two faults was found to be about three kilometers deep, much shallower than had been thought.
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Article Abstract:
Seismic activity occurring before, during and after earthquakes in southern California on Jun 28, 1992 was monitored geodetically using the satellite-borne Global Positioning System (GPS). Specifically, the Permanent GPS Geodetic Array (PGGA) was used to investigate the 7.3 magnitude quake near Landers, CA and the 6.2 magnitude quake near Big Bear, CA. Coseismic and post-seismic motion was detected but no preseismic motion. PGGA thus showed great promise as a tool for earthquake research.
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Article Abstract:
Earthquakes are observed to affect hydrological systems, water levels can change dramatically, streams can become fuller and spring discharges can increase at the time of earthquakes and distant earthquakes increase the permeability in faults. For this, the utility of a simple, non-invasive method is demonstrated for monitoring permeability in confined aquifers or reservoirs.
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