Global variations of large megathrust earthquake rupture characteristics.
Global variations of large megathrust earthquake rupture characteristics.
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DOI：
10.1126/sciadv.aao4915
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发表时间：
2018-03
期刊：
影响因子：
13.6
通讯作者：
Lay T
中科院分区：
文献类型：
--
作者：
Ye L;Kanamori H;Lay T
用辐射能量增强因子（REEF）这一新的度量方法揭示了大地震破裂复杂性的区域性图象。尽管在过去的十年里，大地震沿着俯冲带激增，观测和分析技术也取得了进展，但地震的复杂性主要是由持续的断层性质还是由破坏过程的动力学控制，这一点仍然不清楚。我们引入了辐射能量增强因子（REEF），给出了一个事件的直接测量的辐射能量与计算的最小辐射能量的源具有相同的地震矩和持续时间的比率，以量化破裂的复杂性。分布在全球的119个大的[矩震级（Mw）7.0至9.2]巨型逆冲断层地震的REEF测量显示出显着的系统性区域模式，这表明破裂的复杂性强烈影响持久的地质因素。我们的特点是存在的光滑和粗糙的破裂补丁与不同的interpatch分离，沿着与故障动态产生触发的相互作用，增加对大型事件的区域影响。我们提出了一个改进的粗糙的情况下，将两者的影响和分类全球俯冲带和大地震的基础上，他们的REEF值和滑动模式。破裂距离超过数百公里的大地震可能发生在低REEF斑块和小斑块间距的地区，如1960年智利，1964年阿拉斯加和2011年东北地震，或发生在高REEF斑块和大斑块间距的地区，如2004年苏门答腊和1906年厄瓜多尔-哥伦比亚地震。因此，结合地震震级Mw和REEF，我们提供了一个定量框架，以更好地代表大地震的破裂特征的跨度和了解全球地震活动。
Regional patterns of large earthquake rupture complexity are revealed by a new measure, REEF (radiated energy enhancement factor). Despite the surge of great earthquakes along subduction zones over the last decade and advances in observations and analysis techniques, it remains unclear whether earthquake complexity is primarily controlled by persistent fault properties or by dynamics of the failure process. We introduce the radiated energy enhancement factor (REEF), given by the ratio of an event’s directly measured radiated energy to the calculated minimum radiated energy for a source with the same seismic moment and duration, to quantify the rupture complexity. The REEF measurements for 119 large [moment magnitude (Mw) 7.0 to 9.2] megathrust earthquakes distributed globally show marked systematic regional patterns, suggesting that the rupture complexity is strongly influenced by persistent geological factors. We characterize this as the existence of smooth and rough rupture patches with varying interpatch separation, along with failure dynamics producing triggering interactions that augment the regional influences on large events. We present an improved asperity scenario incorporating both effects and categorize global subduction zones and great earthquakes based on their REEF values and slip patterns. Giant earthquakes rupturing over several hundred kilometers can occur in regions with low-REEF patches and small interpatch spacing, such as for the 1960 Chile, 1964 Alaska, and 2011 Tohoku earthquakes, or in regions with high-REEF patches and large interpatch spacing as in the case for the 2004 Sumatra and 1906 Ecuador-Colombia earthquakes. Thus, combining seismic magnitude Mw and REEF, we provide a quantitative framework to better represent the span of rupture characteristics of great earthquakes and to understand global seismicity.
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影响因子：
64.8
作者：
Ammon, Charles J.;Kanamori, Hiroo;Lay, Thorne
通讯作者：
Lay, Thorne
影响因子：
3.9
作者：
Dublanchet, P.;Bernard, P.;Favreau, P.
通讯作者：
Favreau, P.
影响因子：
5.2
作者：
Ammon, Charles J.;Kanamori, Hiroo;Velasco, Aaron A.
通讯作者：
Velasco, Aaron A.
DOI：
10.1029/jb091ib02p02095
发表时间：
1986-02-10
期刊：
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH AND PLANETS
影响因子：
--
作者：
BOATWRIGHT, J;CHOY, GL
通讯作者：
CHOY, GL
影响因子：
2.9
作者：
Cisternas, M.;Garrett, E.;Ely, L. L.
通讯作者：
Ely, L. L.