Seismic Moments of Major Earthquakes and the Rate of Shortening across the Tien Shan

Details Seismic Moments of Major Earthquakes and the Rate of Shortening across the Tien Shan Seismic Moments of Major Earthquakes and the Rate of Shortening across the Tien Shan

Aug 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000georl..27.2377m&link_type=abstract

Geophysical Research Letters, Volume 27, Issue 16, p. 2377-2380

Physics

15

Geodesy And Gravity: Crustal Movements-Interplate, Seismology: Earthquake Parameters, Seismology: Seismicity And Seismotectonics, Tectonophysics: Continental Neotectonics

Scientific paper

Three Twentieth Century earthquakes that Richter assigned M>=8 and two of comparable magnitude in the Nineteenth Century imply rapid deformation within the Tien Shan. Seismic moment tensors of major earthquakes in this century suggest an average shortening rate of 7 (+/-2) mm yr-1 across the Tien Shan. In the western part, however, where three of the five largest earthquakes occurred, the calculated rate is consistent with the value of ~20 mm yr-1 measured using GPS in that area by Abdrakhmatov et al. As Avouac et al. suggested, the high rate in the western part apparently is a manifestation of counter-clockwise rotation of the Tarim Basin relative to Eurasia about an axis near the east end of the Tien Shan.

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