Idaho, Earthquake from Body Wave Analysis by Diane I. Doser and Robert B. Smith
نویسندگان
چکیده
Modeling of long-period body waves of the Ms = 7.3 Borah Peak, Idaho, earthquake suggests that the earthquake was a simple rupture that nucleated at a depth of about 16 km and propagated unilaterally northwestward toward the surface. The seismic moment tensor obtained from the inversion of teleseismic body wave amplitude data agrees well with the fault plane solution obtained from short-period first motion data (strike, 138 + 3°; dip, 45 _ 3°; rake, 6 0 + 5°) and the observed surface faulting. The scalar double couple moment of 2.1 x 10 ~ dyne-cm obtained from the inversion is comparable to a moment of 1.4 x 102e dyne-cm estimated from the observed surface faulting. Estimates of stress drop based on these values for the moment are 17 to 12 bars, respectively.
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Long-period Surface Waves of Four Western United States Earthquakes Recorded by the Pasadena Strainmeter by Diane I. Doser and Hiroo Kanamori
Long-period surface waves recorded on the north-south Pasadena strainmeter are used to determine the seismic moments and fault parameters of the 19 May 1940 Imperial Valley, California, the 16 December 1954 Dixie Valley and Fairview Peak, Nevada, and the 18 August 1959 Hebgen Lake, Montana, earthquakes. Synthetic strain seismograms are matched with the observed strainmeter seismograms. Source p...
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