Simulation of recurring earthquakes along the Nankai trough and their relationship to the Tokai long‐term slow slip events taking into account the effect of locally elevated pore pressure and subducting ridges
Simulation of recurring earthquakes along the Nankai trough and their relationship to the Tokai long‐term slow slip events taking into account the effect of locally elevated pore pressure and subducting ridges
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考虑局部孔隙压力升高和俯冲脊的影响，模拟南海海槽沿线反复发生的地震及其与东海长期慢滑移事件的关系
DOI：
10.1002/jgrb.50287
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
K. Maeda
中科院分区：
文献类型：
--
作者：
F. Hirose;K. Maeda
南海海槽沿线曾多次发生与菲律宾海板块俯冲到日本之下有关的8级以上地震，其复发间隔为90-150年。人们认为东海断层段的大规模破裂即将发生，因为该断层在 1944 年最近的东南海地震中并未破裂。最近在东海地区观察到反复发生的长期慢滑事件 (LSSE)。为了研究东海地区当前的应力状态，我们使用基于速率和状态相关摩擦定律的由三角形单元组成的三维模型对地震周期进行数值模拟。我们的数值模拟成功模拟了 1944 年东南海地震期间未破裂的东海路段以及东海地区反复出现的 LSSE。我们发现，在 1944 年东南海地震期间，俯冲山脊区域的大特征位移 (L) 和有效法向应力 (σ) 对于避免东海段破裂至关重要。我们还证明，我们可以通过为 Hamana 湖下方的区域分配较低的 σ 和 L 值来重现重复出现的 LSSE，而无需在高滑移率下引入速度强化摩擦定律。我们的模拟显示，在东海段没有破裂的地震之后，LSSE 的振幅增加，这表明最近的 LSSE 可能与东海段应力的积累有关，因为它在 1944 年地震期间没有破裂。
Many earthquakes of moment magnitudes greater than 8 associated with subduction of the Philippine Sea plate under Japan have occurred along the Nankai trough with a recurrence interval of 90–150 years. A large‐scale rupture of the Tokai fault segment is believed to be imminent because that segment did not rupture during the most recent Tonankai earthquake in 1944. Recurring long‐term slow slip events (LSSEs) have recently been observed in the Tokai region. To investigate the current stress state in the Tokai region, we numerically simulated earthquake cycles using a three‐dimensional model consisting of triangular cells based on the rate‐ and state‐dependent friction law. Our numerical simulations successfully modeled the Tokai segment not ruptured during the 1944 Tonankai earthquake as well as the recurring LSSEs in the Tokai region. We found that a large characteristic displacement (L) and effective normal stress (σ) in areas of subducted ridges are essential to avoid rupture of the Tokai segment during the 1944 Tonankai earthquake. We also demonstrated that we can reproduce the recurring LSSEs by assigning low values of σ and L to the area beneath Lake Hamana without introducing a velocity‐strengthening friction law at high slip rate. Our simulation showed that the amplitudes of the LSSEs increased following the earthquakes that did not rupture the Tokai segment, which suggests that the recent LSSEs may be related to the accumulation of stresses in the Tokai segment because it did not rupture during the 1944 earthquake.
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影响因子：
56.9
作者：
Kodaira, S;Iidaka, T;Kaneda, Y
通讯作者：
Kaneda, Y
日本西南部南海海槽大地震破裂区分离及时间间隔和震级变化的机制
DOI：
--
发表时间：
2006
期刊：
J.Earth Simulator 5
影响因子：
--
作者：
Hori;T.
通讯作者：
T.
影响因子：
3.9
作者：
Kato, N
通讯作者：
Kato, N
影响因子：
3
作者：
Kikuchi, M;Nakamura, M;Yoshikawa, K
通讯作者：
Yoshikawa, K