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Toward comparable relative locations between the mainshock slip and aftershocks via empirical approaches
Earth, Planets and Space ( IF 3.362 ) Pub Date : 2020-06-03 , DOI: 10.1186/s40623-020-01203-4
Ta-Wei Chang , Satoshi Ide

The relative locations between mainshocks and their aftershocks have long been studied to characterize the mainshock–aftershock relationships, yet these comparisons may be subjected to biases inherited from various sources, such as the analysis method, data, and model parameters. Here, we perform both a relocation analysis of interplate events to obtain accurate relative centroid locations and a slip inversion analysis of the mainshock slip relative to the relocated events, with some of the relocated events used as empirical Green’s functions, to retrieve the spatiotemporal slip features of the mainshock relative to all of the relocated events. We perform these analyses on the large ( $$6.0 \le M_{W} \le 7.3$$ 6.0 ≤ M W ≤ 7.3 ) interplate earthquakes that occurred near four giant ( $$M_{W} \ge 8.5$$ M W ≥ 8.5 ) megathrust earthquakes: the 2007 $$M_{W} \;8.5$$ M W 8.5 Bengkulu (Indonesia), 2005 $$M_{W} \;8.6$$ M W 8.6 Nias (Indonesia), 2010 $$M_{W} \;8.8$$ M W 8.8 Maule (Chile), and 2011 $$M_{W} \;9.1$$ M W 9.1 Tohoku-Oki (Japan) earthquakes. Most of the spatiotemporal slip features of the mainshocks are consistently recovered using different empirical Green’s functions. We qualitatively and quantitatively demonstrate that the large interplate aftershocks within 5 years of the four analyzed mainshocks are largely located on the periphery or outside of the large-slip regions of these four giant megathrust earthquakes.

中文翻译:

通过经验方法获得主震滑动和余震之间可比较的相对位置

长期以来,人们一直在研究主震与其余震之间的相对位置来表征主震-余震之间的关系,但这些比较可能会受到来自各种来源的偏差的影响,例如分析方法、数据和模型参数。在这里,我们执行板间事件的重定位分析以获得准确的相对质心位置和主震滑动相对于重定位事件的滑动反演分析,其中一些重定位事件用作经验格林函数,以检索时空滑动特征相对于所有重新定位的事件的主震。我们对发生在四个巨型 ( $$M_{W} \ge 8.5$$ MW ≥ 8.5 ) 附近的大型 ( $$6.0 \le M_{W} \le 7.3$$ 6.0 ≤ MW ≤ 7.3 ) 板间地震进行了这些分析特大地震:2007 $$M_{W} \;8.5$$ MW 8.5 Bengkulu(印度尼西亚),2005 $$M_{W} \;8.6$$ MW 8.6 Nias(印度尼西亚),2010 $$M_{W} \;8.8$ $ MW 8.8 Maule(智利)和 2011 $$M_{W} \;9.1$$ MW 9.1 Tohoku-Oki(日本)地震。使用不同的经验格林函数一致地恢复了主震的大部分时空滑动特征。我们定性和定量地证明,4次分析的主震5年内的大板间余震主要位于这4次特大地震的大滑移区外围或外围。使用不同的经验格林函数一致地恢复了主震的大部分时空滑动特征。我们定性和定量地证明,4次分析的主震5年内的大板间余震主要位于这4次特大地震的大滑移区外围或外围。使用不同的经验格林函数一致地恢复了主震的大部分时空滑动特征。我们定性和定量地证明,4次分析的主震5年内的大板间余震主要位于这4次特大地震的大滑移区外围或外围。
更新日期:2020-06-03
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