Dynamic source modeling of the 1978 and 2005 Miyagi‐oki earthquakes: Interpretation of fracture energy

Dynamic source modeling of the 1978 and 2005 Miyagi‐oki earthquakes: Interpretation of fracture energy
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1978 年和 2005 年宫城冲地震的动力源模拟:断裂能的解释

DOI:
10.1029/2009jb006758
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发表时间:
2010
影响因子:
--
通讯作者:
T. Miyatake
T. Miyatake
中科院分区:
--
文献类型:
--
作者:
Takeshi Kimura;K. Koketsu;H. Miyake;Changjiang Wu;T. Miyatake

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[1]我们建立了1978年和2005年日本宫城县地震的自发动力破裂模型,以再现运动震源模型预测的滑动和破裂速度,这些地震在同一板块边界多次发生,震级不同。这些事件的动态源参数的比较使我们能够考虑在同一断层上不同源过程中的破裂动力学行为。特别地,我们比较了两个事件之间的应力降和破裂能,这可以稳定地评估。在两种模型中,整个断面上的应力降最大值和平均值以及在两次事件中破裂的粗糙体上的应力降最大值和平均值几乎相同。另一方面,1978年的地震震级大于2005年的地震,其断裂能值不仅在整个断层上都大于2005年的地震,而且在多次破裂的粗糙面上也大于2005年的地震。这些结果与前人关于裂缝能量与地震矩的标度研究一致。我们还将断裂能值与以前研究中估计的其他内陆事件的断裂能值进行了比较;我们对宫城县地震的预测值要小一些。浅层内陆事件与深层俯冲带事件的构造背景差异可能是造成这种差异的原因。
[1] We constructed spontaneous dynamic rupture models of the 1978 and 2005 Miyagi-oki, Japan, earthquakes, which occurred on the same plate boundary repeatedly with different magnitudes, to reproduce the slip and the rupture velocity predicted by kinematic source models. Comparison of the dynamic source parameters of these events enables us to consider the behavior of rupture dynamics during different source processes on the same fault. In particular, we compared the stress drop and the fracture energy, which can be evaluated stably, between two events. The maximum and average values of the stress drop over the whole fault plane and on an asperity that ruptured during both events are almost identical in the two models. On the other hand, the 1978 event, whose magnitude was larger than the 2005 event, has a fracture energy value larger than that of the 2005 event not only over the whole fault but also on the asperity that ruptured repeatedly. These results are consistent with previous studies of the scaling of fracture energy with the seismic moment. We also compared the fracture energy values with those of other inland events estimated for previous studies; our values for the Miyagi-oki earthquakes are smaller. Differences in tectonic setting between shallow inland events and deep subduction-zone events might cause this discrepancy.
DOI: 10.1186/bf03352855
发表时间: 2008-10
期刊: Earth, Planets and Space
影响因子: --
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