Under what circumstances does a seismogenic patch produce aseismic transients in the later interseismic period?
Under what circumstances does a seismogenic patch produce aseismic transients in the later interseismic period?
复制标题
发震斑块在什么情况下会在震间后期产生地震瞬变？
DOI：
10.1002/2014gl061676
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发表时间：
2014
影响因子：
5.2
通讯作者：
T. Hori
中科院分区：
文献类型：
--
作者：
H. Noda;T. Hori
地震临近时是否出现瞬变是地球物理观测减灾领域的一个重要问题。我们进行了一系列具有惯性效应的速率状态（老化规律）地震序列模拟，并揭示了A/B（直接效应/演化效应）是控制孕震区地震间行为复杂性的关键参数。在地震间，蠕动前锋侵入了一个锁定的补丁。当A/B≤0.4时，一旦相干蠕变的线性稳定性被破坏，就会发生成核，并且不会发生显着的无震瞬变。当A/B≥0.4时，形核尺寸由能量平衡判据给出;当A/B≥0.6时，在线性稳定性破坏之后，在蠕变区能够容纳形核之前，出现了非稳态瞬态。因此，不仅A-B而且A/B都必须仔细选择，以在数值模拟中获得真实的结果。
Whether aseismic transients occur as the next earthquake approaches or not is an important problem in the area of disaster mitigation by geophysical observation. We conducted a series of rate‐state (aging law) earthquake sequence simulations with inertial effects and revealed that A/B (direct effect/evolution effect) is a key parameter controlling the complexity of interseismic behavior in a seismogenic patch. Interseismically, a creep front invades a locked patch. If A/B≤0.4, nucleation takes place as soon as the linear stability of the coherent creep is violated, and no significant aseismic transient occurs. If A/B≥0.4, nucleation size is given by the energy balance criterion, and if A/B≥0.6, aseismic transients occur after the violation of linear stability and before the creeping region is able to host the nucleation. Thus, not only A − B but also A/B must be selected carefully to obtain realistic results in numerical simulations.