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
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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.
Telka, A.
中科院分区:
地球科学1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.

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由于历史上较低的地震活动性、晚第四纪冰川冲刷和茂密的植被往往掩盖了断层相关的地貌特征,因此,表征北卡斯卡迪亚俯冲带弧前地壳第四纪活动断层的危害具有挑战性。我们将激光雷达地形与横跨温哥华岛南部Leech河断层的古地震沟相结合,得出了加拿大不列颠哥伦比亚省陆地前断层的第一个详细的地表破裂历史。结果表明,该断层在过去~ 9kyr内产生了三次地表破裂地震,因此将来有能力产生大地震(Mw >.6)。我们提供了断层长度(~ 130 km)和全新世滑动率(≥0.2-0.3 mm/年)的新约束条件,这些约束条件与地震年龄一起,应纳入与不列颠哥伦比亚省西南部(加拿大)和华盛顿州西北部(美国)城市中心相关的新的地震危害评估和建筑规范实践。
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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