The September 2009 Padang earthquake
The September 2009 Padang earthquake
复制标题
2009 年 9 月巴东地震
DOI：
10.1038/ngeo753
复制
发表时间：
2010
影响因子：
18.3
通讯作者：
McCloskey J
中科院分区：
文献类型：
--
作者：
McCloskey J
图1| Summarty巨型逆冲断层自1797年以来苏门答腊西部大规模逆冲断层地震的地震滑动历史。历史地震的轮廓用直线框表示。滑动分布（彩色标度）显示了2005年和2007年事件（参考文献1）的总地震滑动，其震中由彩色星星表示。红色的星星表示巴塘地震的震中。焦点机制（黑白白色“海滩球”）在地图视图中。B，板块耦合的分布2（色标）;高耦合的区域可能在地震期间经历最多的滑动。c，a中虚线框内巨型逆冲断层上解析的巴塘事件的库仑应力（CS）。我们考虑的机制作用沿着东西向的故障平面，解决应力的板块界面模拟为一个平面倾斜的沟槽在12 190公里，并在25进一步东北下的苏门答腊海岸。我们使用μ= 0.4的摩擦系数;灵敏度测试表明这种选择并不重要。应力范围从震源正上方约-8 bar（强松弛）到西北和东南几十公里处的3 bar（中等载荷）。应力标度已在0.2 bar处截断，以使小应力可见。应力一般朝海沟方向减小，在西比路下方较小，但略呈负值，预计西比路下方的地震威胁最大。震源机制已经被旋转，以纠正板块的局部倾角;也就是说，如果板块被压扁或从未俯冲，它就是会得到的机制。
Figure 1| The Sumatran megathrust. a, The history of seismic slip in the great megathrust earthquakes in western Sumatra since 1797. Outlines of historical earthquakes are shown as rectilinear boxes. The slip distribution (colour scale) shows total seismic slip in the 2005 and 2007 events (after ref. 1), whose epicentres are indicated by coloured stars. The red star indicates the epicentre of the Padang earthquake. The focal mechanism (black-and-white ‘beach ball’) is in map view. b, Distribution of plate coupling2 (colour scale); areas of high coupling might be expected to experience most slip during earthquakes. c, Coulomb stress (CS) from the Padang event resolved on the megathrust within the dashed box in a. We consider the mechanism acting along the east–west failure plane, resolving stresses onto the plate interface modelled as a plane dipping from the trench at 12 for 190 km and at 25 farther northeast under the Sumatran coast. We use a friction coefficient of μ= 0.4; sensitivity tests indicate that this choice is not crucial. Stresses range from about− 8 bar (strong relaxation) directly above the hypocentre to 3 bar (moderate loading) a few tens of kilometres to the northwest and southeast. The stress scale has been truncated at 0.2 bar to make small stresses visible. Stresses generally decrease towards the trench and are small but slightly negative under Siberut, where the highest seismic threat is expected. The focal mechanism has been rotated to correct for the local dip of the slab; that is, it is the mechanism that would have been obtained if the slab were fiattened or had never subducted.
俯冲纳斯卡板块中间隔狭窄的双地震带
DOI：
--
发表时间：
2004
期刊：
影响因子：
--
作者：
A. Rietbrock;F. Waldhauser
通讯作者：
F. Waldhauser
苏门答腊岛西部未来的巨型逆冲地震对印度洋造成海啸威胁
DOI：
--
发表时间：
2008
期刊：
影响因子：
--
作者：
J. McCloskey;A. Antonioli;A. Piatanesi;K. Sieh;S. Steacy;S. Nalbant;M. Cocco;C. Giunchi;Jian Huang;P. Dunlop
通讯作者：
P. Dunlop