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首页> 外文期刊>Bulletin of the Seismological Society of America >Passive-source seismic imaging of the crust and upper mantle beneath the 2001 M _w 7.7 bhuj earthquake region, Gujarat, India
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Passive-source seismic imaging of the crust and upper mantle beneath the 2001 M _w 7.7 bhuj earthquake region, Gujarat, India

机译：印度古吉拉特邦2001 M _w 7.7 bhuj地震区下方地壳和上地幔的被动源地震成像

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摘要

Variations in crustal and lithospheric thicknesses below the Kachchh rift (KR) zone have been investigated employing the joint inversion of P receiver functions (RF) and Rayleigh-wave and Love-wave group velocity dispersion (5-70 s) on the broadband waveforms of teleseismic events. Estimated crustal and lithospheric thicknesses at 15 broadband sites led to the delineation of an updoming of 4-7 km in the Moho and 6-12 km in the asthenosphere beneath the central KR relative to the surrounding unrifted regions. The Moho depths vary from 35 to 42 km and lithospheric thicknesses range from 62 to 78 km. The observed marked shear velocity reduction (2%-6%) at the lithosphere-asthenosphere boundary (LAB) over an area of 120 km × 80 km suggests the presence of patches of partial melt in the asthenosphere below the KR, evidencing the possible presence of imprints of the Deccan-Reunion mantle plume. The coincidence of the area of updoming of the Moho and asthenosphere, and the confined aftershock activity below the central KR implies that these patches could provide a high input of volatile CO _2 into the lower crust, which might play a key role in generating the continued aftershock activity in the region since the occurrence of the 2001 M _w 7.7 Bhuj mainshock.
机译：在Kachchh裂谷（KR）区域以下，地壳和岩石圈厚度的变化已通过使用P接收器函数（RF）和瑞利波和洛夫波群速度色散（5-70 s）的联合反演来研究远震事件。估计在15个宽带站点的地壳和岩石圈厚度导致相对于周围的未裂谷区域，中心KR下方的Moho上升了4-7 km，软流圈上升了6-12 km。莫霍面深度从35到42 km不等，岩石圈厚度从62到78 km不等。在120 km×80 km的岩石圈-软流圈边界（LAB）上观察到明显的剪切速度降​​低（2％-6％），这表明在KR下方的软流圈中存在部分熔融斑块，表明可能存在Deccan-Reunion地幔柱的烙印。莫霍面和软流圈的颠覆区域的重合以及中央KR下方有限的余震活动意味着这些斑块可以向下地壳中提供大量的挥发性CO _2输入，这可能在产生持续的余辉中起关键作用。自2001 M _w 7.7 Bhuj主震发生以来该地区的余震活动。

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