globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2020.116353
论文题名:
Overlapping regions of coseismic and transient slow slip on the Hawaiian décollement
作者: Lin J.-T.; Aslam K.S.; Thomas A.M.; Melgar D.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 544
语种: 英语
中文关键词: 2018 Mw7.1 Hawaii earthquake ; coseismic SSE overlap ; earthquake cycle modeling ; fault mechanics ; joint inversion ; slow slip event
英文关键词: Earthquake effects ; Tsunamis ; Accumulated stress ; Different time scale ; Earthquake rupture ; Individual sections ; Inversion results ; Overlapping regions ; Regularization parameters ; Strong motion records ; Fault slips ; coseismic process ; decollement ; earthquake event ; earthquake magnitude ; earthquake mechanism ; fault slip ; faulting ; hazard assessment ; slip rate ; tectonic setting ; tsunami ; Hawaii [United States] ; United States
英文摘要: Earthquakes and slow slip are different faulting processes that release accumulated stress on different time scales. Despite nearly two decades of study, it is still unclear whether the same section of fault is capable of hosting both slow, aseismic and fast, seismic slip. Here, we jointly invert GPS, strong motion records, and empirically corrected tsunami waveforms for the 2018 M7.1 Hawai'i earthquake. Our inversion results suggest the earthquake had a slow rupture speed of 1.2 km/s with a maximum slip of ∼3 m South-East of the hypocenter extending to the South-West through an area known to regularly host slow slip events. After exploring how the choice of fault geometry and regularization parameters affect the slip distributions of the earthquake and slow slip events we find strong evidence of overlap between the two. Additionally, we perform numerical modeling to simulate fast and slow slip behavior. Due to the homogeneity of the Hawaiian décollement differences in effective stress are likely an important factor that causes the diversity of slip. We find that an earthquake can completely penetrate into the slow slip zone provided the effective stress differences between fast and slow slip zones is large enough to facilitate this. Our results reinforce the idea that an individual section of fault is capable of hosting a variety of distinct slip behaviors. This is important for estimating earthquake rupture extent and for better ground motion and tsunami hazard assessment. © 2020 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165120
Appears in Collections:气候变化与战略

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作者单位: Department of Earth Sciences, University of Oregon, 1272 University of Oregon, Eugene, OR 97403, United States

Recommended Citation:
Lin J.-T.,Aslam K.S.,Thomas A.M.,et al. Overlapping regions of coseismic and transient slow slip on the Hawaiian décollement[J]. Earth and Planetary Science Letters,2020-01-01,544
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