Downgoing plate topography stopped rupture in the A.D. 2005 Sumatra earthquake

Downgoing plate topography stopped rupture in the A.D. 2005 Sumatra earthquake
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公元 2005 年苏门答腊岛地震中,下降的板块地形阻止了破裂

DOI:
10.1130/g37258.1
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发表时间:
2016
期刊:
影响因子:
5.8
通讯作者:
Henstock T
Henstock T
中科院分区:
地球科学1区
文献类型:
--
作者:
Henstock T

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俯冲带的地震使板块边界断层破裂成离散的部分。一个可能控制这种分割的因素是下行板块的地形,尽管这是通过削弱还是加强断层而引起的争议。我们使用多道地震和重力数据映射的顶部下行的海洋地壳离岸中央苏门答腊,印度尼西亚。我们的调查跨越了一个复杂的段边界区之间的南部终止的Mw= 8.7,公元2005年Simeulue-Nias地震,和北方终止的主要地震,部分填充了一个Mw= 7.7事件在1935年。我们确定了一个孤立的3公里高的基底在这个区域的北方边缘,接近2005年的滑动终止。高压可能起源于沃顿化石脊,在局部和全球数据集中几乎都是孤立的,这表明虽然它周围的区域可能被压裂和流体削弱,但基底高压局部加强了板块边界,阻止了破裂传播。
Earthquakes in subduction zones rupture the plate boundary fault in discrete segments. One factor that may control this segmentation is topography on the downgoing plate, although it is controversial whether this is by weakening or strengthening of the fault. We use multichannel seismic and gravity data to map the top of the downgoing oceanic crust offshore central Sumatra, Indonesia. Our survey spans a complex segment boundary zone between the southern termination of the Mw= 8.7, A.D. 2005 Simeulue-Nias earthquake, and the northern termination of a major 1797 earthquake that was partly filled by an Mw= 7.7 event in 1935. We identify an isolated 3 km basement high at the northern edge of this zone, close to the 2005 slip termination. The high probably originated at the Wharton fossil ridge, and is almost aseismic in both local and global data sets, suggesting that while the region around it may be weakened by fracturing and fluids, the basement high locally strengthens the plate boundary, stopping rupture propagation.
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