Unbending combined with dehydration embrittlement as a cause for double and triple seismic zones
Unbending combined with dehydration embrittlement as a cause for double and triple seismic zones
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不弯曲与脱水脆化相结合是双地震带和三地震带的原因
DOI：
10.1029/2002gl015441
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发表时间：
2002
影响因子：
5.2
通讯作者：
Kelin Wang
中科院分区：
文献类型：
--
作者：
Kelin Wang
使用一个模型的弹性理想塑性板，我证明，板伸直与脱水脆化相结合，可以解释的形态和应力的双或三重地震带（DSZ的或TSZ的）中观察到的许多俯冲板。致密化变质反应可能在板状地壳中引起张应力和高孔隙流体压力，从而产生了TSZ的上部地震活动带。有限的脱水作用可能会适度地提高板幔内的流体压力，但板幔的不弯曲通常会主导地幔应力，并导致另外两个地震活动带。DSZ是不发达的TSZ。
Using a model of elastic‐perfectly plastic plate, I demonstrate that plate unbending combined with dehydration embrittlement can account for the morphology and stresses of double or triple seismic zones (DSZ's or TSZ's) observed in many subducting slabs. Densifying metamorphic reactions may induce tensile stresses as well as high pore fluid pressures in the slab crust and thus generate the upper seismicity band of the TSZ. Limited dehydration may moderately elevate the fluid pressure in the slab mantle, but unbending usually dominates mantle stresses and results in another two seismicity bands. DSZ's are underdeveloped TSZ's.