Unraveling the roles of fault asperities over earthquake cycles

Wang, Lifeng; Xu, Shiqing; Zhuo, Yanqun; Liu, Peixun; Ma, Shengli

doi:10.1016/j.epsl.2024.118711

Earth and Planetary Science Letters

2024

DOI: 10.1016/j.epsl.2024.118711

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Unraveling the roles of fault asperities over earthquake cycles

Lifeng Wang,

Shiqing Xu,

Yanqun Zhuo

et al.

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2024

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Dual-initiation ruptures in the 2024 Noto earthquake encircling a fault asperity at a swarm edge

Xu,

Ji,

Meng

et al. 2024

Science

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To reveal the connections between the 2024 moment magnitude ( M w ) 7.5 Noto earthquake in Japan and the seismicity swarms that preceded it, we investigated its rupture process through near-source waveform analysis and source imaging techniques, combining seismic and geodetic datasets. We found notable complexity in the initial rupture stages. A strong fault asperity, which remained unbroken in preceding seismic swarms, slowed down the rupture. Then, a second rupture initiated at the opposite edge of the asperity, and the asperity succumbed to double-pincer rupture fronts. The failure of this high-stress drop asperity drove the earthquake into a large-scale event. Our observations help unravel the crucial role of fault asperities in controlling swarm migration and rupture propagation and underscore the need for detailed seismological and interdisciplinary studies to assess seismic risk in swarm-prone regions.

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Dual-initiation ruptures in the 2024 Noto earthquake encircling a fault asperity at a swarm edge

Xu,

Ji,

Meng

et al. 2024

Science

View full text Add to dashboard Cite

show abstract

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Unraveling the roles of fault asperities over earthquake cycles

Cited by 1 publication

References 64 publications

Dual-initiation ruptures in the 2024 Noto earthquake encircling a fault asperity at a swarm edge

Dual-initiation ruptures in the 2024 Noto earthquake encircling a fault asperity at a swarm edge

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