Slab dehydration and earthquake distribution beneath southwestern and central Japan based on three-dimensional thermal modeling
Slab dehydration and earthquake distribution beneath southwestern and central Japan based on three-dimensional thermal modeling
复制标题
基于三维热模拟的日本西南部和中部地区的板片脱水和地震分布
DOI：
10.1002/2016gl072295
复制
发表时间：
2017
影响因子：
5.2
通讯作者：
and S. Yoshioka
中科院分区：
文献类型：
--
作者：
Ji;Y.;and S. Yoshioka
我们开发了一个 3D 热对流模型来估计日本西南部和中部下方的热状况、含水量分布和板片脱水，在从四国西部到东海地区的板块界面上经常观察到深层构造震动和短期慢滑移事件（S-SSE）。结果表明，S-SSE、深部构造震动和常规地震的压力-温度（P-T）条件表明，它们可能起源于与俯冲有关的板片脱水，导致葡萄石-阳起石/硬钠石蓝片岩向具有大热梯度的角闪岩相变。板块脱水和倾角方向的温度梯度被认为是控制日本西南部和中部下方菲律宾海板块慢震和规则地震发生的关键因素，尽管深部构造震动更为复杂，因为它们可能受到日本西南部相对较低的温度梯度的影响。
We developed a 3‐D thermal convection model to estimate the thermal regime, water content distribution, and slab dehydration beneath southwestern and central Japan, where deep tectonic tremors and short‐term slow slip events (S‐SSEs) are frequently observed on the plate interface extending from the western Shikoku to the Tokai district. The results showed that the pressure‐temperature (P‐T) conditions for the S‐SSEs, deep tectonic tremors, and regular earthquakes indicate that they probably originated from slab dehydration in association with subduction, resulting in a phase transformation from prehnite‐actinolite/lawsonite blueschist to amphibolite with a large thermal gradient. Slab dehydration and the thermal gradient in the dip direction are considered key factors for controlling the seismogenesis of slow and regular earthquakes in the Philippine Sea plate beneath southwestern and central Japan, although the deep tectonic tremors are more complicated because they are likely favored by a comparatively low temperature gradient in southwestern Japan.