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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Inchworm-like source evolution through a geometrically complex fault fueled persistent supershear rupture during the 2018 Palu Indonesia earthquake
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Inchworm-like source evolution through a geometrically complex fault fueled persistent supershear rupture during the 2018 Palu Indonesia earthquake

机译：通过几何复杂断层燃料持续的超空破裂在2018年帕鲁印度尼西亚地震期间，春瓦虫源进化

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摘要

How does fault slip follow an earthquake rupture front propagating faster than the local shear-wave velocity (i.e., at supershear speed)? How does a supershear rupture front pass through a geometrically complex fault system? Resolving the evolution of such complex earthquake ruptures is fundamental to our understanding of earthquake-source physics, but these events have not been well captured by conventional waveform inversions of observational data. We applied a new framework of finite-fault inversion to globally observed teleseismic waveforms and resolved both the spatiotemporal evolution of slip and the fault geometry of the 2018 Palu earthquake (moment magnitude 7.6) in Sulawesi, Indonesia. We show that supershear rupture propagation for this event was sustained by transient slip stagnation and advancement as the rupture front passed through the geometrically complex fault system. This peculiar inchworm-like slip evolution was caused by the rupture front encountering fault bends with favorable and unfavorable orientations for rupture propagation. Our analysis also identified the possible existence of a fault junction beneath Palu Bay connecting an unmapped primary fault in northern Sulawesi with the Palu-Koro fault in the south. (C) 2020 Elsevier B.V. All rights reserved.
机译：故障滑动如何遵循地震破裂前沿比局部剪切波速度快（即以上速度）更快？超级破裂前线如何穿过几何复杂故障系统？解决这些复杂地震破裂的演变是我们对地震源物理学的理解的基础，但这些事件尚未通过常规的观测数据的波形反转来捕获。我们将全球观察到的Telesmic波形应用了一个新的有限故障反演框架，并解决了印度尼西亚苏拉威西索的2018年PALU地震（时刻7.6）的滑坡和故障几何形状。我们表明，由于破裂前沿通过几何复杂故障系统，因此通过瞬态滑动停滞和进步来维持这一事件的超空破裂传播。这种类似的纯粹的鳞片状滑动演进是由断裂前部遇到故障弯曲，以具有良好的繁殖和不利的定向。我们的分析还确定了Palu Bay下面的故障交界处的可能存在，在南部的Palu-Koro断层中连接了北方苏拉威西州未映射的主要故障。 （c）2020 Elsevier B.v.保留所有权利。

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