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首页> 外文期刊>Seismological research letters >Coulomb Stress Change and Evolution Induced by the 2008 Wenchuan Earthquake and its Delayed Triggering of the 2013 M_w 6.6 Lushan Earthquake
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Coulomb Stress Change and Evolution Induced by the 2008 Wenchuan Earthquake and its Delayed Triggering of the 2013 M_w 6.6 Lushan Earthquake

机译：2008年汶川地震引起的库仑应力变化和演化及其2013年鲁瓦夏6.6级地震的延迟触发

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Almost five years after the 12 May 2008 M_w 7.9 Wenchuan earthquake, the Longmenshan fault zone was struck by the April 20 M_w 6.6 Lushan earthquake, with its hypocenter located ~45 km southwest of the southern end of the Wenchuan surface rupture (Han et al., 2014; Zhang et al., 2014; Fig. 1). Such proximity in space and time between the two events implies that the later event is an aftershock of the previous one, or in other words, the previous event played a more important role in the occurrence of the latter than the long-term tectonic loading did. Early studies on the problem had split opinions. On one hand, Du et al. (2013), Liu et al. (2013), and Xu et al. (2013) considered the two earthquakes as independent events. Wang et al. (2013) and Parsons and Segou (2014), on the other hand, claimed that the Lushan earthquake should be viewed as an aftershock of the Wenchuan earthquake. Whereas each group has its own basis of reasoning, lack of quantitative examination makes these claims less convincing. In recent years, Coulomb stress change has been widely used in estimating magnitude of stress loading for identification of areas or structures at increased risk of earthquake triggering (e.g., Harris, 1998; Stein, 1999; Chéry et al., 2001; Freed and Lin, 2001; Pollitz and Sacks, 2002; Freed, 2005; Steacy et al., 2005; Gomberg and Felzer, 2008). In this paper, we apply this method to investigate to what extent the Lushan earthquake has been triggered by the Wenchuan earthquake. Previous studies have explored the consequence of the 2008 Wenchuan earthquake on the changes in Coulomb stresses on the major faults in the region (Parsons et al., 2008; Toda et al., 2008; Luo and Liu, 2010; Wan and Shen, 2010; Xu et al., 2010; Nalbant and McClosky, 2011). These studies indicated that both coseismic rupture and postseismic viscoelastic relaxation of the 2008 Wenchuan earthquake may have significantly increased/decreased stress levels on some neighborhood faults. Here we calculate both the coseismic and postseismic Coulomb stress changes caused by the 2008 Wenchuan earthquake based on a 3Dviscoelastic model with updated coseismic slip distribution, and compare these contributions with the tectonic stress loading accumulated since theWenchuan earthquake to assess the significance of the triggering effect of theWenchuan earthquake.
机译：2008年5月12日汶川7.9级地震发生将近5年后，龙门山断裂带于4月20日汶川6.6级庐山地震中震中，其震源位于汶川地表破裂南端西南约45公里（Han等。 ，2014; Zhang et al。，2014;图1）。这两个事件之间在空间和时间上的这种接近性意味着，后一个事件是前一个事件的余震，换句话说，前一个事件在后一个事件的发生中比长期构造载荷起着更重要的作用。 。对该问题的早期研究存在分歧。一方面，杜等人。 （2013），Liu等。 （2013），和Xu等。 （2013）认为这两次地震是独立的事件。 Wang等。 （2013）和Parsons and Segou（2014）则认为，庐山地震应被视为汶川地震的余震。尽管每个组都有自己的推理基础，但缺乏定量检查会使这些主张缺乏说服力。近年来，库仑应力变化已广泛用于估算应力载荷的大小，以识别地震触发风险增加的区域或结构（例如，Harris，1998; Stein，1999;Chéry等，2001; Freed和Lin ，2001; Pollitz和Sacks，2002; Freed，2005; Steacy等人，2005; Gomberg和Felzer，2008）。在本文中，我们使用这种方法来调查汶川地震在多大程度上触发了庐山地震。先前的研究已经探究了2008年汶川地震对该地区主要断层库仑应力变化的影响（Parsons等，2008; Toda等，2008; Luo and Liu，2010; Wan and Shen，2010） ; Xu et al。，2010; Nalbant and McClosky，2011）。这些研究表明，2008年汶川地震的同震破裂和震后粘弹性松弛都可能使某些邻近断层的应力水平显着升高/降低。在此，我们使用具有更新的同震滑动分布的3D粘弹性模型，计算了2008年汶川地震引起的同震和震后库仑应力变化，并将这些贡献与汶川地震以来积累的构造应力载荷进行了比较，以评估震源触发效应的重要性。汶川地震。

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