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首页> 外文期刊>Earth, planets and space: EPS >Using the 2011 Mw 9.0 off the Pacific coast of Tohoku Earthquake to test the Coulomb stress triggering hypothesis and to calculate faults brought closer to failure
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Using the 2011 Mw 9.0 off the Pacific coast of Tohoku Earthquake to test the Coulomb stress triggering hypothesis and to calculate faults brought closer to failure

机译：使用2011年东北太平洋地震的9.0兆瓦来测试库仑应力触发假设并计算更接近故障的断层

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The 11 March 2011 Tohoku Earthquake provides an unprecedented test of the extent to which Coulomb stress transfer governs the triggering of aftershocks. During 11-31 March, there were 177 aftershocks with focal mechanisms, and so the Coulomb stress change imparted by the rupture can be resolved on the aftershock nodal planes to learn whether they were brought closer to failure. Numerous source models for the mainshock have been inverted from seismic, geodetic, and tsunami observations. Here, we show that, among six tested source models, there is a mean 47% gain in positively-stressed aftershock mechanisms over that for the background (1997-10 March 2011) earthquakes, which serve as the control group. An aftershock fault friction of 0.4 is found to fit the data better than 0.0 or 0.8, and among all the tested models, Wei and Sladen (2011) produced the largest gain, 63%. We also calculate that at least 5 of the seven large, exotic, or remote aftershocks were brought ≥0.3 bars closer to failure. With these tests as confirmation, we calculate that large sections of the Japan trench megathrust, the outer trench slope normal faults, the Kanto fragment beneath Tokyo, and the Itoigawa-Shizuoka Tectonic Line, were also brought ≥0.3 bars closer to failure.
机译：2011年3月11日的东北地震对库仑应力传递控制余震的触发程度进行了空前的检验。在3月11日至31日期间，发生了177次带有震源机制的余震，因此可以在余震节点平面上解决由破裂引起的库仑应力变化，以了解它们是否更接近失效。地震，大地测量和海啸观测结果已经颠倒了许多主震源模型。在这里，我们表明，在六个测试震源模型中，与作为对照组的背景地震（1997年3月10日至2011年3月10日）相比，正应力余震机制平均增加了47％。发现余震断层摩擦系数为0.4可以更好地拟合数据，优于0.0或0.8，在所有测试模型中，Wei和Sladen（2011）产生的增益最大，为63％。我们还计算出，在七个较大的，异乎寻常的或偏远的余震中，至少有5个被拉近≥0.3 bar接近失效。通过这些测试的确认，我们计算出日本海沟的大推力，外海沟坡正断层，东京下方的关东断层和条井川静冈构造线的大部分也接近了0.3巴。

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