Dependence of earthquake size distributions on convergence rates at subduction zones

Details Dependence of earthquake size distributions on convergence rates at subduction zones Dependence of earthquake size distributions on convergence rates at subduction zones

Oct 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21.2327m&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 21, no. 21, p. 2327-2330

Physics

4

Distribution (Property), Earthquakes, Plates (Tectonics), Subduction (Geology), Convergence, Coupling Coefficients, Seismology

Scientific paper

The correlation of numbers of thrust earthquakes of moment magnitude 7 or greater in this century at subduction zones with convergence rate results from a combination of lower recurrence intervals for earthquakes of a given size where slip rates are high and peak in the global distribution of subduction zone convergence rates at high values (55 to 90 mm/yr). Hence, physical mechanisms related to convergence rate, such as plate interface force, slab pull, or thermal effects, are not required to explain the distribution of large earthquakes with convergence rate. The seismic coupling coefficient ranges from 10% to 100% at subduction zone segments where convergence is faster than 45 mm/yr but does not correlate with rate. The coefficient is generally orders of magnitude lower at rates below 40 mm/yr which may be due to long recurrence intervals and a short sampling period (94 years).

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