Imaging the rupture process of the 10 January 2018 MW7.5 Swan island,Honduras earthquake* |
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| Authors: | Chuang Cheng Dun Wang |
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| Affiliation: | School of Earth Sciences, China University of Geosciences, Wuhan 430074, China |
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| Abstract: | The 10 January 2018 MW7.5 Swan island, Honduras earthquake occurred on the Swan island fault, which is a transform plate boundary between the North American and Caribbean plates. Here we back-project the rupture process of the earthquake using dense seismic stations in Alaska, and find that the earthquake ruptured at least three faults (three stages) for a duration of ~40 s. The rupture speed for the longest fault (stage 3) is as fast as 5 km/s, which is much faster than the local shear wave velocity of ~4 km/s. Supershear rupture was incidentally observed on long and straight strike-slip faults. This study shows a supershear rupture that occured on a strike-slip fault with moderate length, implying that supershear rupture might commonly occur on large strike-slip earthquakes. The common occurrence of supershear rupture on strike-slip earthquakes will challenge present understanding of crack physics, as well as strong ground motion evaluation in earthquake engineering. |
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| Keywords: | source process back-projection rupture speed supershear rupture |
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