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首页> 外文期刊>Geochemistry, geophysics, geosystems >Thermal state of the Explorer segment of the Cascadia subduction zone: Implications for seismic and tsunami hazards
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Thermal state of the Explorer segment of the Cascadia subduction zone: Implications for seismic and tsunami hazards

机译：Cascadia俯冲区的勘探器段的热状态：对地震和海啸危害的影响

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摘要

The Explorer segment of northernmost Cascadia is an end-member "warm" subduction zone with very young incoming plate and slow-convergence rate. Understanding the megathrust earthquake potential of this type of subduction zone is of both geodynamic and societal importance. Available geodetic observations indicate that the subduction megathrust of the Explorer segment is currently locked to some degree, but the downdip extent of the fault area that is potentially seismogenic is not known. Here we construct finite-element models to estimate the thermally allowed megathrust seismogenic zone, using available knowledge of regional plate kinematics, structural data, and heat flow observations as constraints. Despite ambiguities in plate interface geometry constrained by hypocenter locations of low-frequency earthquakes beneath Vancouver Island, the thermal models suggest a potential rupture zone of similar to 60 km downdip width located fully offshore. Using dislocation modeling, we further illustrate that a rupture zone of this size, even with a conservative assumption of similar to 100 km strike length, can cause significant tsunami-genic deformation. Future seismic and tsunami hazard assessment in northern Cascadia must take the Explorer segment into account.
机译：最北部的Cascadia的探险家段是一个最终成员的“温暖”俯冲区，具有非常年轻的入口板和缓慢收敛速度。了解这种俯冲区的Megathrust地震潜力是地球动力学和社会重要性。可用的大地测量观测表明，勘探器段的俯冲率目前被锁定到某种程度上，但是潜在的震源发生的故障面积的下降程度尚不清楚。在这里，我们构建有限元模型来估计热允许的Megathrust Seisisogic区，使用区域板运动学，结构数据和热流观测的可用知识作为约束。尽管在温哥华岛下低频地震的低频地震的低速度地区受到限制的板界面几何结构中，但热模型建议潜在的破裂区，类似于60公里的下脚宽度。使用位错建模，我们进一步说明了这种尺寸的破裂区域，即使具有类似于100公里的击球长度的保守假设，也会导致大量的海啸变形。 Cascadia北部的未来地震和海啸危害评估必须考虑探险家分部。

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