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首页> 外文期刊>Earth, planets and space: EPS >Rise time and source duration of the 2008 MW 7.9 Wenchuan (China) earthquake as revealed by Rayleigh waves
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Rise time and source duration of the 2008 MW 7.9 Wenchuan (China) earthquake as revealed by Rayleigh waves

机译：瑞利波揭示的2008年汶川7.9级汶川地震（中国）的上升时间和震源持续时间

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摘要

The fault parameters of the 2008 Wenchuan earthquake were studied in a rupture directivity analysis by simultaneously inverting the period of the first Fourier spectral-node and the 100-s phase-delay time of the Rayleigh wave. The results show that the earthquake is a unilateral event with an optimal rupture azimuth of N59°E, consistent with the distribution of aftershocks. They also indicate that the fault plane strike is in the NE-SW direction, corresponding to the fault plane strike of 238° and NW-dipping (reported by the USGS). The inversion shows the source duration (including the rise time and rupture time) and rise time are 70±0.8 s and 9.3±0.6 s, respectively. The rupture velocity estimated only from the rupture time exhibits relatively higher value, 3.45±0.10 km/s, close to or larger than the S-wave velocity in the crust. One possible cause is that the rupture mechanism transferred from the thrust faulting in the southwestern portion of the fault to the strike-slip faulting in the northeastern one. The rise time offers an estimate of the dynamic stress drop (37.8±2.3 bars), from which through a macroscopic view the radiated seismic energy of (5.93±0.4) × 1016 N m is calculated. Although the estimated rupture length (∼210 km) and source duration are shorter than several source rupture models, the current analyses show the first-order rupture feature of the 2008 Wenchuan earthquake rupturing the Longmenshan fault zone.
机译：通过同时反转第一个傅立叶谱节点的周期和瑞利波的100 s相延迟时间，在断裂方向性分析中研究了2008年汶川地震的断裂参数。结果表明，该地震为单向事件，最佳破裂方位角为N59°E，与余震分布一致。它们还表明，断层走向是在NE-SW方向上，对应于238°的断层走向和西北倾角（由USGS报告）。反演显示源持续时间（包括上升时间和破裂时间）和上升时间分别为70±0.8 s和9.3±0.6 s。仅根据破裂时间估算的破裂速度显示出相对较高的值，即3.45±0.10 km / s，接近或大于地壳中的 S 波速度。一个可能的原因是，断裂机制从断层西南部的逆冲断层转变为东北断层的走滑断层。上升时间提供了动态应力降的估计值（37.8±2.3 bar），从中可以通过宏观视角计算出（5.93±0.4）×10 16 N m的辐射地震能。尽管估计的破裂长度（〜210 km）和震源持续时间都比几种震源破裂模型短，但目前的分析显示，2008年汶川地震龙门山断裂带破裂的一阶破裂特征。

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