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Source parameters of the 28 October 1983 Borah Peak, Idaho, earthquake from body wave analysis

机译:体波分析得出的爱达荷州1983年10月28日波拉峰的震源参数

摘要

Modeling of long-period body waves of the M_S = 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, −60 ± 5°) and the observed surface faulting. The scalar double couple moment of 2.1 × 10^(26) dyne-cm obtained from the inversion is comparable to a moment of 1.4 × 10^(26) 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.
机译:对爱达荷州M_S = 7.3 Borah Peak的长周期体波进行的建模表明,地震是一次简单的破裂,其破裂深度约为16 km,并向西北单向传播。从远震体波振幅数据的反演获得的地震矩张量与从短周期的第一运动数据获得的断层平面解非常吻合(走向:138±3°;倾角:45±3°;倾角:-60±5 °)和观察到的表面断层。从反演获得的标量双偶数矩为2.1×10 ^(26)达因-厘米,与从观测到的表面断层估计的1.4×10 ^(26)达因-厘米的矩相当。目前基于这些值的应力降估计分别为17至12 bar。

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