Limited overlap between the seismic gap and coseismic slip of the great 2010 Chile earthquake
Limited overlap between the seismic gap and coseismic slip of the great 2010 Chile earthquake
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DOI：
10.1038/ngeo1073
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发表时间：
2011-03-01
影响因子：
18.3
通讯作者：
Piatanesi, A.
中科院分区：
文献类型：
--
作者：
Lorito, S.;Romano, F.;Piatanesi, A.
2010年2月27日发生在智利马乌莱地区近海的M-w 8.8巨型逆冲地震和海啸并不意外。自1835年大地震以来，构造负荷一直在累积的区域存在一个明确的地震空区（1-13）1（4）。在这里，我们联合反演海啸和大地测量数据，以获得一个强大的模型同震滑动分布和诱导同震应力变化。我们将这些与过去的地震和地震前锁定分布进行比较（13），以评估Maule地震是否填补了地震空白。结果表明，主滑移斑位于差距以北，与1928年M-w 8.0地震破裂带重叠，次级滑移集中区位于南侧。地震空区仅被部分填充，高震前锁定区仍未被破坏，这与地震破裂分布可能与震前锁定相关的假设不一致。此外，我们的结论是，增加应力的完整补丁可能反过来增加了另一个大到大地震的概率在不久的将来。
The M-w 8.8 mega-thrust earthquake and tsunami that occurred on 27 February 2010 offshore the Maule region, Chile, was not unexpected. A clearly identified seismic gap(1-13) existed in an area where tectonic loading has been accumulating since the great 1835 earthquake1(4). Here we jointly invert tsunami and geodetic data to derive a robust model for the coseismic slip distribution and induced coseismic stress changes. We compare these with past earthquakes and the preseismic locking distribution(13), to assess if the Maule earthquake has filled the seismic gap. We find that the main slip patch is located to the north of the gap, overlapping the rupture zone of the M-w 8.0 earthquake that occurred in 1928, with a secondary concentration of slip to the south. The seismic gap was only partially filled and a zone of high preseismic locking remains unbroken, inconsistent with the assumption that distributions of seismic rupture might be correlated with preseismic locking. Moreover, we conclude that increased stress on the unbroken patch may in turn have increased the probability of another major to great earthquake there in the near future.