Ambient noise Rayleigh wave tomography in western Sichuan and eastern Tibet

Ambient noise Rayleigh wave tomography in western Sichuan and eastern Tibet
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川西藏东环境噪声瑞利波层析成像

DOI:
10.1016/j.epsl.2009.03.021
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发表时间:
2009-05
影响因子:
5.3
通讯作者:
--
中科院分区:
地球科学1区
文献类型:
--
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利用四川数字地震台网49个台站的宽频带资料,应用背景噪声法对川西藏东地区进行了瑞利波层析成像。垂直分量的环境噪声数据的互相关计算在一个小时的片段和堆叠在7个月,从2007年6月至12月。采用多重滤波分析法测量了6 ~ 48 s的瑞利波群频散曲线。反演了8 ~ 44 s周期的群速度图。由此产生的群速度图一般表现出良好的相关性与构造特征。由于沉积层厚,四川盆地在短周期(8 ~ 20 s)内具有明显的低群速度特征,青藏高原东缘中地壳存在明显的低速带。龙门山冲断带不仅标志着高海拔的青藏高原与低海拔的四川盆地之间的快速横向速度变化,而且标志着青藏高原下的厚地壳向四川盆地下的正常陆壳的过渡。
We perform Rayleigh wave tomography in western Sichuan and eastern Tibet by applying the ambient noise method to broadband data recorded at 49 stations from the Sichuan digital seismic network. Cross-correlations of vertical-component ambient noise data are computed in one-hour segments and stacked over 7 months from June to December 2007. Then Rayleigh wave group dispersion curves from 6 to 48 s were measured using the multiple-filter analysis method. Group velocity maps at periods from 8 to 44 s were inverted. The resulting group velocity maps generally show good correlations with tectonic features. The Sichuan Basin is clearly resolved with lower group velocities at the short periods (8 to 20 s) due to thick sedimentary layers, and a prominent low-velocity zone exhibits in the middle crust beneath the eastern margin of the Tibetan Plateau. The Longmen Shan thrust belt marks not only the rapid lateral velocity variation between the topographically high Tibetan Plateau and low-elevation Sichuan Basin, but also the transition from the thick crust beneath the Tibetan Plateau to the normal continental crust beneath the Sichuan Basin.
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