Holocene Surface Rupture History of an Active Forearc Fault Redefines Seismic Hazard in Southwestern British Columbia, Canada
Holocene Surface Rupture History of an Active Forearc Fault Redefines Seismic Hazard in Southwestern British Columbia, Canada
复制标题
活动弧前断层的全新世表面破裂历史重新定义了加拿大不列颠哥伦比亚省西南部的地震危险
DOI:
10.1029/2018gl078711
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发表时间:
2018
影响因子:
5.2
通讯作者:
Telka, A.
中科院分区:
文献类型:
--
作者:
Morell, K. D.;Regalla, C.;Amos, C.;Bennett, S.;Leonard, L.;Graham, A.;Reedy, T.;Levson, V.;Telka, A.
Characterizing the hazard associated with Quaternary‐active faults in the forearc crust of the northern Cascadia subduction zone has proven challenging due to historically low rates of seismicity, late Quaternary glacial scouring, and dense vegetation that often obscures fault‐related geomorphic features. We couple lidar topography with paleoseismic trenching across the Leech River Fault on southern Vancouver Island to produce the first detailed surface rupture history of an onland forearc fault in British Columbia, Canada. The results indicate that this fault produced three surface‐rupturing earthquakes in the last ∼9 kyr and is therefore capable of producing large (Mw>6) earthquakes in the future. We provide new constraints on the fault's length (∼130 km) and Holocene slip rate (≥0.2–0.3 mm/year) that, together with the earthquake ages, should be incorporated into new seismic hazard assessments and building code practices relevant to urban centers in southwestern British Columbia (Canada) and northwestern Washington State (United States).
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