Seismogenesis of dual subduction beneath Kanto, central Japan controlled by fluid release.
Seismogenesis of dual subduction beneath Kanto, central Japan controlled by fluid release.
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DOI：
10.1038/s41598-017-16818-z
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发表时间：
2017-12-04
影响因子：
4.6
通讯作者：
Manea M
中科院分区：
文献类型：
--
作者：
Ji Y;Yoshioka S;Manea VC;Manea M
双俯冲代表了一种不寻常的俯冲情况，其中一个海洋板块俯冲到另一个海洋板块之上，形成高度复杂的构造环境。由于两个俯冲板块之间复杂的相互作用，该地区地震活动的起源仍不完全清楚。在这里，我们研究了日本中部关东地区下方双重俯冲的热结构，该双重俯冲是由于三沟槽交界的独特情况而形成的。使用针对关东地区特定双俯冲环境定制的高分辨率三维热力模型，我们发现，与单板块俯冲系统相比，双板块俯冲系统会产生地幔流、热和流体释放模式的强烈变化，从而强烈控制区域地震活动分布。这里，位于菲律宾海板片下方的太平洋板片地震活动的加深是通过该地区榴辉岩化锋面更深处（约 150 公里深度）的延迟来解释的。另一方面，在菲律宾海板片中观察到的较浅的地震活动与年轻且温暖的板块俯冲有关，并且可能与在板片下方行进然后在板片顶部向上移动的热地幔流的存在有关。
Dual subduction represents an unusual case of subduction where one oceanic plate subducts on top of another, creating a highly complex tectonic setting. Because of the complex interaction between the two subducted plates, the origin of seismicity in such region is still not fully understood. Here we investigate the thermal structure of dual subduction beneath Kanto, central Japan formed as a consequence of a unique case of triple trench junction. Using high-resolution three-dimensional thermo-mechanical models tailored for the specific dual subduction settings beneath Kanto, we show that, compared with single-plate subduction systems, subduction of double slabs produces a strong variation of mantle flow, thermal and fluid release pattern that strongly controls the regional seismicity distribution. Here the deepening of seismicity in the Pacific slab located under the Philippine Sea slab is explained by delaying at greater depths (~150 km depth) of the eclogitization front in this region. On the other hand, the shallower seismicity observed in the Philippine Sea slab is related to a young and warm plate subduction and probably to the presence of a hot mantle flow traveling underneath the slab and then moving upward on top of the slab.
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影响因子：
5.2
作者：
Nakajima, Junichi;Hasegawa, Akira
通讯作者：
Hasegawa, Akira
影响因子：
3.5
作者：
Mueller, R. Dietmar;Sdrolias, Maria;Roest, Walter R.
通讯作者：
Roest, Walter R.
影响因子：
64.8
作者：
MCKENZIE, DP;MORGAN, WJ
通讯作者：
MORGAN, WJ
影响因子：
3.9
作者：
Nakajima, Junichi;Hirose, Fuyuki;Hasegawa, Akira
通讯作者：
Hasegawa, Akira
影响因子：
64.8
作者：
Kincaid, C;Griffiths, RW
通讯作者：
Griffiths, RW