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利用远震接收函数反演重庆地震台下方的速度结构
Velocity structure inversion beneath stations of Chongqing seismic network using teleseismic receiver function
- DOI:
- 作者:
- 郭欣 王小龙 勾宪斌 余国政
- 作者单位:
- 中国重庆 401147重庆市地震局
- 关键词:
- 接收函数；地震反演； HK法；速度结构
Receiver function; Seismic inversion; HK method; Velocity structure
- 摘要:
- 选取重庆地震台2010年至2012年记录到的60个远震宽频带数字地震记录，采用频率域反褶积法获得台站的接收函数，并用H-Kappa叠加方法来反演台站下方的地壳厚度和泊松比。然后通过H-Kappa法反演得到的台站下方的地壳厚度,作为台站下方波速反演的约束条件，以减少反演的非唯一性。计算结果显示重庆地震台下的地壳厚度为42km,这与广泛认同的中国大陆中西部地区Moho深度在38至45km保持一致。这对增强该区的深部地质构造特征、分析孕震机制等研究具有积极的意义。
On basis of 60 teleseismic broadband digital seismic records from 2010 to 2012 recorded by Chongqing seismic network, frequency deconvolution method is used to calculate receiver functions and H-kappa stacking method is adopted to inverse the thickness and Poisson ratio in crust of this area. Then the crustal thickness inversed by H-Kappa stacking method is used as a constraint for velocity inversion beneath the seismic network in order to reduce inversion non-uniqueness. The result shows that the crustal thickness beneath Chongqing seismic network is about 42 km. This is consistent with the Moho depth (between 38 and 45 km) in the central and western regions in China. It has a positive meaning for enhancing this area’s characteristics of deep geological structure, earthquake nucleate analysis, and so on.
