The November 20,1960 Peru Tsunami Earthquake: Source mechanism of a slow event
The November 20,1960 Peru Tsunami Earthquake: Source mechanism of a slow event
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1960 年 11 月 20 日秘鲁海啸地震：慢事件的震源机制
DOI：
10.1029/gl017i006p00661
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发表时间：
1990
影响因子：
5.2
通讯作者：
D. Wiens
中科院分区：
文献类型：
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作者：
A. Pelayo;D. Wiens
1960年11月20日秘鲁地震激发了一场海啸，对于中等震级的地震（M 6. 75 PAS）来说，这是非常大的。体波第一运动结合所观察到的爱瑞利波频谱比表明滑动沿着一个浅倾角逆冲断层，而不是一个单一的力机制暗示的滑坡。SH波形的反褶积显示由4个子事件组成的时间函数，总持续时间为110 s。利用该时间函数，体波反演得到了一个非常浅倾的逆冲断层机制（走向0°，倾角6°，滑动100°）和1.9 × 1027dyn cm的地震矩。然而，从有限带体波得到的时间函数不能拟合面波数据，面波数据显示振幅随周期和3.4 × 1027达因厘米的时刻大幅增加。这两种类型的数据可以通过组合体波时间函数和代表较长周期分量的130 s余弦时间函数来建模。这次事件是秘鲁海岸这一相对无震地区沿着发生的最大地震。海啸激发相对于测得的地震矩和矩震级（MW 7.6）并不异常。海啸高度和面波震级之间的差异是由于震源持续时间长而导致传统震级标度低估地震规模的结果。
The November 20,1960 Peru earthquake excited a tsunami that was anomalously large for an earthquake of moderate magnitude (M 6.75 PAS). Body wave first motions combined with observed Love to Rayleigh wave spectral ratios indicate slip along a shallowly dipping thrust fault rather than a single force mechanism suggestive of a landslide. Deconvolution of SH waveforms shows a time function consisting of 4 subevents with a total duration of 110 s. Using this time function, body waveform inversion yields a very shallowly dipping thrust faulting mechanism (strike 0°, dip: 6°, slip: 100°) and a seismic moment of 1.9 × 1027 dyn cm. However, the time function obtained from the band limited body waveforms cannot fit the surface wave data which show a large increase in amplitude with period and a moment of 3.4 × 1027 dyn cm. Both types of data can be modeled by combining the body wave time function and a 130 s cosine time function representing a longer period component. This event represents the largest earthquake to occur along this relatively aseismic portion of the Peruvian coast. The tsunami excitation is not anomalous relative to the measured seismic moment and moment magnitude (MW 7.6). The disparity between tsunami height and surface wave magnitude results from underestimation of the earthquake size by conventional magnitude scales due to the long source duration.
根据验潮仪数据推断 1960 年智利地震的海啸来源
DOI：
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发表时间：
2010
期刊：
影响因子：
--
作者：
Nguyen-T.;H. A.;Matsumoto;J.;and Endo;N.;Yushiro Fujii
通讯作者：
Yushiro Fujii