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DOI | 10.1029/2020GL087400 |
Evidence of a Supershear Transition Across a Fault Stepover | |
H.L. Kehoe; E.D. Kiser | |
2020-04-09 | |
发表期刊 | Geophysical Research Letters
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出版年 | 2020 |
英文摘要 | 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 Mw 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. |
领域 | 气候变化 |
URL | 查看原文 |
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文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/249058 |
专题 | 气候变化 |
推荐引用方式 GB/T 7714 | H.L. Kehoe,E.D. Kiser. Evidence of a Supershear Transition Across a Fault Stepover[J]. Geophysical Research Letters,2020. |
APA | H.L. Kehoe,&E.D. Kiser.(2020).Evidence of a Supershear Transition Across a Fault Stepover.Geophysical Research Letters. |
MLA | H.L. Kehoe,et al."Evidence of a Supershear Transition Across a Fault Stepover".Geophysical Research Letters (2020). |
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