| 应用地震层析成象技术研究深部速度结构 |
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| 引用本文： | 范广伟 Wall.,TC.应用地震层析成象技术研究深部速度结构[J].CT理论与应用研究,1999,8(1):1-8. |
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| 作者姓名： | 范广伟 Wall. TC |
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| 作者单位： | 美国加州大学ＳａｎｔａＣｒｕｚ分校，美国亚里桑那大学，南亚里桑那地震观测台，日本爱媛大学 |
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| 摘 要： | 罗马尼亚Ｖａｎｃｅａ地震区是大陆上发生与板块磁撞和削减有关的中深部地震活动的地区之一。本文介绍了应用地震层析成象方法研究该地区深部速度结构成果。在研究中使用了地方和区域地震所记录的４３３个浅源和中部地震的到时资料反演求解深至２００ｋｍ的三维速度结构，在走时和射线路径的计算中利用了有效的三维射线跟踪技术，在反演中采用ＬＳＱＲ算法，高分辨率的地震层析图象揭示了速度结构的广泛不均匀性，结果表明，地震层析
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| 关 键 词： | 地震层析成像 速度结构 地震活动 深源地震 |
A Seismic Tomography Study of Deep Velocity Structure |
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| Fan Guangwei, Wallace T C,Zhao Dapeng and Wu Rushan.A Seismic Tomography Study of Deep Velocity Structure[J].Computerized Tomography Theory and Applications,1999,8(1):1-8. |
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| Authors: | Fan Guangwei Wallace T C Zhao Dapeng and Wu Rushan |
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| Abstract: | Seismic tomography was utilized to image deep velocity structure in the Vrancea seismic zone Romania, where intermediate-depth seismicity is associated with subduction and plate collision.We used arrival time data from 433 shallow and intermediate- depth earthquakes recorded by local and regional seismic stations to invert for the three- dimensional (3-D) seismic velocity structure.The travel times and ray paths were calculated by an efficient 3-D ray-tracing technique. The P wave velocity struture was determined from the surface down to a depth of 200 km by using the LSQR algorithm. High-resolution tomographic images reveal a pattern of broad heterogeneity in the velocity structure Our results indicate that seismic tomography can be a powerful tool for understanding continental geodynamics; |
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| Keywords: | Seismic Tomography Velocity Structure Seismicity Acknowledgments: This work was partially supported by NSF grants EAR-9418482 (G F and T W )and EAR-9526810(D Z) |
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