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首页> 外文期刊>Earth, planets and space: EPS >Outer trench-slope faulting and the 2011 Mw 9.0 off the Pacific coast of Tohoku Earthquake
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Outer trench-slope faulting and the 2011 Mw 9.0 off the Pacific coast of Tohoku Earthquake

机译：东北太平洋地震海沟外坡断裂和2011 Mw 9.0

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The 11 March 2011 off the Pacific coast of Tohoku Earthquake (Mw 9.0) produced megathrust displacements of at least 40 m. The resulting tsunami devastated the Honshu coast southwest of regions struck by earthquake-generated tsunami in 1611, 1896 and 1933. The 1896 Meiji-Sanriku earthquake was also an underthrusting earthquake, but the 1933 Sanriku-oki earthquake was a trench-slope normal faulting event; both generated inundation heights of 10 to 25 m along the coast of Iwate prefecture. Possible occurrence of a great outer trench-slope earthquake seaward of the 2011 Tohoku Earthquake along a southwestward extension of the 1933 fault zone is a concern. The second largest 2011 aftershock, an outer rise Mw 7.7 normal faulting earthquake occurred near the southern end of the 1933 rupture. Additional aftershock activity has been distributed along a trend below the trench and diffusely spread in the outer rise, seaward of the megathrust region where the largest slip occurred. Coulomb stress perturbations of at least 5-10 bars are calculated for outer rise normal fault geometries for mainshock slip models. Whether a future great trench slope event will occur is uncertain, but the potential tsunamigenic hazard can be gauged by the huge inundations accompanying the 1933 rupture.
机译：2011年3月11日东北东北太平洋地震（Mw 9.0）产生了至少40 m的大推力位移。由此产生的海啸摧毁了1611、1896和1933年地震引发的海啸袭击的本州海岸西南部。1896年的明治三陆地震也是一个下推力地震，但1933年的三陆冲木地震是一条沟渠斜坡正常的断裂事件。 ;两者都在岩手县沿海产生了10至25 m的淹没高度。令人担忧的是，2011年东北地震沿1933年断裂带的西南延伸可能会发生大的海沟外海地震。 2011年发生的第二大余震是1933年破裂南端附近发生的7.7兆瓦正常地震外层地震。额外的余震活动已沿沟槽下方的趋势分布，并在最大推力发生的巨型推力区的海面向外扩展，并扩散开来。对于主冲击滑动模型的外部上升法向断层几何，计算出至少5-10 bar的库仑应力扰动。不确定未来是否会发生巨大的海沟倾斜事件，但潜在的海啸致灾危险可以通过1933年破裂后的大量洪水来衡量。

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