Mathematics – Logic
Scientific paper
Jul 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19.1499w&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 19, no. 14, July 24, 1992, p. 1499-1502.
Mathematics
Logic
Displacement, Earth Crust, Earthquakes, Geological Faults, Seismology, England, Turkey
Scientific paper
Some regions have no earthquakes above magnitude 5.5, and thus apparently contain only small active faults, with length than the thickness of the brittle upper crust. Britain and SSW Turkey are examples, with strain rates 3 x 10 exp -20 and 3 x 10 exp -17/s. Their seismicity has Gutenberg-Richter parameter b = 1.5, larger than 1 typical elsewhere, sufficient for equal strain to be associated with each order-of-magnitude of fault length present. These regions deform by increasing lengths and number densities of small faults. When strain reaches 0.01, these faults will be so closely-spaced that they may interact, forming large faults that cut the brittle layer and take up most later deformation. Deformation involving only small faults will last less than 1 Myr in regions with strain rate 10 exp -15/s, and is unlikely to be observed.
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