Role of Serpentinized Mantle Wedge in Affecting Megathrust Seismogenic Behavior in the Area of the 2010 M = 8.8 Maule Earthquake

Role of Serpentinized Mantle Wedge in Affecting Megathrust Seismogenic Behavior in the Area of the 2010 M = 8.8 Maule Earthquake
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蛇纹石化地幔楔对 2010 年 M=8.8 马乌莱地震地区巨型逆冲断层孕震行为的影响

DOI:
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发表时间:
2020
影响因子:
5.2
通讯作者:
D. Lange
D. Lange
中科院分区:
地球科学1区
文献类型:
--
作者:
Kelin Wang;Taizi Huang;F. Tilmann;S. Peacock;D. Lange

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是什么控制了俯冲大逆冲断层的地震成因--地幔楔角的下倾?我们建议,在该地区的2010年Mw = 8.8马乌莱,智利,地震,来自水化地幔楔的基础上的蛇纹石矿物发挥主导控制。基于建模,我们预测MWC附近的巨型逆冲断层带含有丰富的利蛇纹石/富含纤蛇纹石的蛇纹岩,这些蛇纹岩在更深处转化为富含叶蛇纹石的蛇纹岩。从32-40 km深度的MWC到至少55 km,主要是速度加强的巨型逆冲断层容纳了2010年破裂的动态传播,但有小的滑动和负应力降。板间余震的下倾分布在MWC周围显示出一个间隙,这可以用利蛇纹石/温石棉的速度强化行为来解释。分散的速度减弱和动力减弱叶蛇纹石丰富的补丁进一步下倾可能是负责增加余震的丰度,并可能在2010年破裂的一些高频能量辐射。
What controls subduction megathrust seismogenesis downdip of the mantle wedge corner (MWC)? We propose that, in the region of the 2010 Mw = 8.8 Maule, Chile, earthquake, serpentine minerals derived from the base of the hydrated mantle wedge exert a dominant control. Based on modeling, we predict that the megathrust fault zone near the MWC contains abundant lizardite/chrysotile‐rich serpentinite that transforms to antigorite‐rich serpentinite at greater depths. From the MWC at 32–40 km depth to at least 55 km, the predominantly velocity‐strengthening megathrust accommodated dynamic propagation of the 2010 rupture but with small slip and negative stress drop. The downdip distribution of interplate aftershocks exhibits a gap around the MWC that can be explained by the velocity‐strengthening behavior of lizardite/chrysotile. Interspersed velocity‐weakening and dynamic weakening antigorite‐rich patches farther downdip may be responsible for increased abundance of aftershocks and possibly for some of the high‐frequency energy radiation during the 2010 rupture.
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