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首页> 外文期刊>Journal of Asian earth sciences >Sediment thickness beneath the Indo-Gangetic Plain and Siwalik Himalaya inferred from receiver function modelling
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Sediment thickness beneath the Indo-Gangetic Plain and Siwalik Himalaya inferred from receiver function modelling

机译:根据接收者函数模型推断印度恒河平原和Siwalik Himalaya下方的沉积物厚度

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摘要

The Indo-Gangetic Plain and the adjoining Siwalik Himalaya are the seismically most vulnerable regions due to high density of human population and presence of thick sediments that amplify the seismic waves due to an earthquake in the region. We investigate the sedimentary structure and crustal thickness of the region through joint inversion of the receiver function time series at 14 broadband seismograph locations and the available Rayleigh velocity data for the region. Results show significant variability of sedimentary layer thicknesses from 1.0 to 2.0 km beneath the Delhi region to 2.0-5.0 km beneath the Indo-Gangetic Plain and the Siwalik Himalaya. As we progress from the Delhi to the Indo-Gangetic Plain, we observe a decrease in the shear velocity in sedimentary layer from ~2.0 km/s to ~1.3 km/s while the layer thickness increases progressively from ~1.0 km in south to 2.0-5.0 km in the north. Average S-velocity in the sedimentary layer beneath the Siwalik Himalaya is ~2.1 km/s. Crustal thicknesses varies from ~42 in the Delhi region, ~48 km in the Indo-Gangetic Plain, ~50 km in the western part of Siwalik Himalaya to ~60 km in the Kumaon region of Siwalik Himalaya.
机译:印度洋恒河平原和毗邻的西瓦里克·喜马拉雅山脉是地震中最脆弱的地区,这归因于人口密度高和存在厚实的沉积物,这些沉积物放大了该地区地震造成的地震波。我们通过对14个宽带地震仪位置处的接收器函数时间序列进行联合反演以及该区域的可用瑞利速度数据,来研究该区域的沉积结构和地壳厚度。结果表明,沉积层厚度的变化很大,从德里地区以下的1.0至2.0 km到印度恒河平原和Siwalik喜马拉雅山以下的2.0-5.0 km。当我们从德里向印度恒河平原前进时,我们观察到沉积层的剪切速度从约2.0 km / s减小到〜1.3 km / s,而层厚从南部的约1.0 km逐渐增加到2.0北部-5.0公里。 Siwalik Himalaya下方沉积层的平均S速度为〜2.1 km / s。地壳厚度的变化范围从德里地区的〜42,印度恒河平原的〜48 km,锡瓦里克·喜马拉雅山西部的〜50 km到锡瓦里克·喜马拉雅山的库莫恩地区的〜60 km。

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