Mathematics – Logic
Scientific paper
Aug 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20.1683k&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 16, p. 1683-1686.
Mathematics
Logic
5
Crustal Fractures, Fluid Pressure, Geological Faults, Seismology, Tectonics, California, Cross Sections, Earth Crust
Scientific paper
The role of high fluid pressure as a seismogenic agent has been the subject of intense study. Of particular interest is the so-called fault-valve mechanism, a hypothesis whereby fluid pressure rises (as a result of tectonic compression and pore volume reduction) until crustal failure occurs, triggering seismic activity and upward fluid discharge. Sealing and healing of the rock matrix following coseismic stress drop facilitates reaccumulation of fluid pressure, initiating another loading cycle. The fault-valve mechanism is entertained as a plausible explanation for present-day seismic activity in the western Transverse Ranges of California. We provide a quantitative test of the fault-valve hypothesis that uses geologic data and rates of active tectonics for a cross section through an active fold-and-thrust belt on the flank of a developing mountain range. Rates of fluid pressure buildup and average recurrence times of large earthquakes in the fold-and-thrust belt are estimated to be on the order of 10,000 Pa/yr and hundreds of years, respectively.
Keller Edward A.
Loáiciga Hugo A.
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