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Seismic stress perturbation and triggering patterns induced by the 2016 Central Italy earthquake sequences

Journal of Mountain Science 2021年第6期18卷 1424-1438页

作者： ZHANG Lu-peng HUANG Ding-fa JIANG Zhong-shan FENG Wei HASSAN Abubakr Faculty of Geosciences and Environmental Engineering Southwest Jiaotong UniversityChengdu 611756China Division of Geodetic Science School of Earth ScienceOhio State UniversityColumbusOH43210USA Faculty of Engineering Karary UniversityKhartoum 12304Sudan

Numerous shallow earthquakes, including 24 th August Amatrice, 26 th October Visso, and 30 th October Norcia earthquakes, ruptured the segments of Mount Vettore-Gorzano fault system in the central Apennines(Italy) in 2016. In order to investigate the stress perturbation and triggering patterns among the earthquake sequences, we introduce a more realistic nonplanar coseismic fault geometry model, which improve the rupture model by assimilating relocated aftershocks and the GPS observations. We adopt the seismic slip inversion program of the steepest descent method(SDM) to create the detailed coseismic rupture models and optimize Coulomb Failure stress model by varying the coefficient of friction and received fault parameters. The results indicate that the nonplanar fault geometry model is more reflective of the deep slip of the coseismic rupture than planar model. As evidenced by the coseismic Coulomb stress changes caused by the three mainshocks at different depth slices, the stress loading mainly distributes on the active fault zones and the stress changes can well explain the spatial distribution of aftershocks. The first large Amatrice mainshock accelerates the occurrence of the Mw 5.9 Visso and Mw 6.6 Norcia earthquakes, with the positive stress changes at the hypocenter exceeding the stress triggering threshold(0.010×10^(6) Pa) and up to 0.015×10^(6) and 0.257×10^(6) Pa, respectively. Furthermore, the Mw 5.9 Visso earthquake as well encourages the occurrence of the Mw 6.6 Norcia event with the increased stress changes of 0.052×10^(6) Pa on the hypocenter. It is concluded that the stress transfer and accumulation play crucial roles on the linkage triggering mechanism among the mainshock-mainshock and mainshockaftershocks. Noteworthily, the cumulative stress changes on the southwest segment of the Norcia Fault(NF), the southeast parts of the Montereale Fault System(MFS) and Mount Gorzano Fault(MGF) of the main regions are up to(1.5~3.5) ×10^(6) Pa. The cumulative

关键词： GPS Relocated aftershocks Nonplanar fault geometry stress perturbation Seismic triggering patterns Seismic risk assessment

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Near-field triggering of microearthquakes along the Longitudinal Valley fault in eastern Taiwan

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Earthquake Science 2020年第5期33卷 273-280页

作者： Tong Lu Shujun Liu Chi-Chia Tang Hubei Subsurface Multi-scale Imaging Key Laboratory Institute of Geophysics and GeomaticsChina University of GeosciencesWuhan 430074China State Key Laboratory of Geological Processes and Mineral Resources Institute of Geophysics and GeomaticsChina University of GeosciencesWuhan 430074China

Dynamic earthquake triggering as a well-documented phenomenon can provide valuable information for studying the stress loading cycle from failure on *** this study,seismicity rate changes were investigated in the Longitudinal Valley fault(LVF)following the 2019 M_(L)5.2 Hualien earthquake,which occurred offshore in eastern *** the matched filter technique was applied to continuous waveform data,twice as many microearthquakes were newly detected in the vicinity of the LVF compared with the number listed in the Taiwan Weather Bureau *** rates in the northern segment of the LVF increased immediately following the Hualien mainshock,which indicated dynamic triggering during the passage of seismic *** analysis suggested that following seismic events might be attributed to fault slipping or *** findings show that the observation of earthquake triggering can provide valuable assistance in monitoring the stress perturbations of active faults.

关键词： near-field triggering eastern Taiwan matched-filter technique stress perturbation seismic waves Hualien earthquake

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