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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Tottori earthquakes and Daisen volcano: Effects of fluids, slab melting and hot mantle upwelling
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Tottori earthquakes and Daisen volcano: Effects of fluids, slab melting and hot mantle upwelling

机译：鸟取地震和雏菊火山：流体，板坯熔化和热披风的影响

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摘要

We investigate the 3-D seismic structure of source areas of the 6 October 2000 Western Tottori earthquake (M 7.3) and the 21 October 2016 Central Tottori earthquake (M 6.6) which occurred near the Daisen volcano in SW Japan. The two large events took place in a high-velocity zone in the upper crust, whereas low-velocity (low-V) and high Poisson's ratio (high-sigma) anomalies are revealed in the lower crust and upper mantle. Low-frequency micro-earthquakes (M 0.0-2.1) occur in or around the low-V and high-sigma zones, which reflect upward migration of magmatic fluids from the upper mantle to the crust under the Daisen volcano. The nucleation of the Tottori earthquakes may be affected by the ascending fluids. The flat subducting Philippine Sea (PHS) slab has a younger lithosphere age and so a higher temperature beneath the Daisen and Tottori area, facilitating the PHS slab melting. It is also possible that a PHS slab window has formed along the extinct Shikoku Basin spreading ridge beneath SW Japan, and mantle materials below the PHS slab may ascend to the shallow area through the slab window. These results suggest that the Daisen adakite magma was affected by the PHS slab melting and upwelling flow in the upper mantle above the subducting Pacific slab. (C) 2017 Elsevier B.V. All rights reserved.
机译：我们研究了2000年10月6日西鸟田地震（M 7.3）的3D地震结构，2016年10月21日中央鸟田地震（M 6.6），该地震（M 6.6）在SW日本的雏菊火山附近发生。两种大事件发生在上层地壳的高速区中，而低速（低V）和高泊松比（高Sigma）异常在下部地壳和上部地幔中露出。低频微地震（0.0-2.1）在低V和高Σ区发生，反映了岩石液从上部地幔向上迁移到Daisen火山下的外壳。圆圈地震的成核可能受上行液的影响。菲律宾海洋（PHS）板块的扁平岩层具有较小的岩石圈年龄，因此在雏菊和鸟取区域下方的温度较高，促进了PHS板坯熔化。在SW日本下方的灭绝的Shikoku盆地扩展脊沿着灭绝的Shikoku盆地扩展脊形成了PHS板式窗口也可能，并且在PHS板下方的地幔材料可以通过板坯窗口上升到浅区域。这些结果表明，Daisen Adakite Magma受到底板太平洋板上的上部地幔中的PHS板坯熔化和上升流量的影响。 （c）2017年Elsevier B.V.保留所有权利。

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