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首页> 外文期刊>Earth, planets and space: EPS >Coupling coefficient, hierarchical structure, and earthquake cycle for the source area of the 2011 off the Pacific coast of Tohoku earthquake inferred from small repeating earthquake data
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Coupling coefficient, hierarchical structure, and earthquake cycle for the source area of the 2011 off the Pacific coast of Tohoku earthquake inferred from small repeating earthquake data

机译：根据小重复地震数据推断的2011年东北太平洋沿岸地震震源区的耦合系数，层级结构和地震周期

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摘要

We have estimated the spatial distribution of interplate coupling in and around the source area for the 2011 Tohoku earthquake from small repeating earthquake data. The source area of the 2011 Tohoku earthquake exhibited a relatively high coupling coefficient (>0.5) for the period from 1993 to 2007 and was surrounded by areas of low coupling (<0.5) at its western (down-dip), northern and southern extents. These low-coupling areas probably prevented further propagation of the mainshock rupture. A high coupling coefficient is estimated even near the trench that can act as the source of the large tsunami of the present earthquake. The averaged seismic coupling of 0.5-0.8 in the M 9 earthquake's source area and the seismic moment of the earthquake suggest that the slip deficit for the M 9 earthquake was accumulated over a period of 260-880 years, consistent with the recurrence interval of such great earthquakes from tsunami deposit data. It also suggests that the several M ～ 7 earthquakes which have occurred in the source area since 1926 were minor events that released only a part of the accumulated strain energy. The hierarchical structure of asperities, as in the case of the Kamaishi sequence, may be the key to understanding huge earthquakes that encompass several smaller asperities.
机译：我们从小规模重复地震数据中估算了2011年东北地震震源区及其周边地区板间耦合的空间分布。在1993年至2007年期间，2011年东北地震的震源区表现出较高的耦合系数（> 0.5），并且在其西部（下倾），北部和南部范围被低耦合（<0.5）区域包围。这些低耦合区域可能阻止了主冲击破裂的进一步传播。即使在可能成为本次地震海啸源头的海沟附近，也估计有很高的耦合系数。 M 9地震震源区的平均地震耦合为0.5-0.8，地震的地震矩表明，M 9地震的滑移赤字是在260-880年的时间内积累的，与此类地震的复发间隔一致。海啸矿床数据显示大地震。这也表明，自1926年以来发生在源区的几次M〜7地震都是较小的事件，仅释放了一部分累积的应变能。就像Kamaishi序列一样，粗糙的层次结构可能是理解包含几个较小粗糙的大地震的关键。

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