期刊
GEOPHYSICAL RESEARCH LETTERS
卷 47, 期 10, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2020GL087400
关键词
supershear; step over; transform; back projection; Aleutian; rupture
资金
- National Science Foundation [EAR-1802441]
Supershear earthquakes, propagating faster than the Earth's shear wave velocity, can generate strong ground motion at distances far from the ruptured fault. Despite the hazards associated with these earthquakes, the exact fault properties that govern their occurrence are not well constrained. Although early studies associated supershear ruptures with simple fault geometries, recent dynamic rupture models have revealed a supershear transition mechanism over complex fault geometries such as fault stepovers. Here we present the first observation of a supershear transition on a fault stepover system during the 2017 M-w 7.7 Komandorsky Islands earthquake. Using a high-resolution back-projection technique, we find that the earthquake's rupture velocity accelerates from 2.1 to 5.0 km/s between two offset faults, demonstrating the viability of a new supershear transition mechanism occurring in nature. Given the fault complexity of the Earth's transform plate boundaries, this result may improve our understanding of supershear rupture processes and their associated hazards.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据