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由多震相走时和波形作三维地震成像
引用本文:金昭九,李清河,Jung-in Lee,Ho Sung Jang.由多震相走时和波形作三维地震成像[J].CT理论与应用研究,2000,9(4):44-47.
作者姓名:金昭九  李清河  Jung-in Lee  Ho Sung Jang
作者单位:1. 韩国汉阳大学地震研究所
2. 中国地震局兰州地震研究所,730000
3. The Korea Seismological Institute, Ahnsaan, South Korea
4. Damkook University, Seoul, South Korea
摘    要:本项成果包括:提出天然地震走时反演层析成像技术,采用下列方法使得处理结果得以改善:1)利用32个地震,404条射线的Pg,Sg,Pm,Sm,Pn,Sn等震相增加约束条件:2)用已有精度较高的人工地震测深化结果作速度约束;3)用波形反演来修改模型,把波源,介质吸收,散射等物理特征集中反映在记录中,把诸多物理量开发出来互为约束,以修改后的模型再作反演,使解的稳定性大大提高;4)采用最优化过程,选择遗传

关 键 词:多震相走时反演  波形反演  三维地震成像

3D Seismic Tomography by Using Traveltimes and Waveforms of Multi-phase
So Gu Kim,Qinghe Li,Erdenedalai Lkhasuren,Jung-in Lee,Ho Sung Jang.3D Seismic Tomography by Using Traveltimes and Waveforms of Multi-phase[J].Computerized Tomography Theory and Applications,2000,9(4):44-47.
Authors:So Gu Kim  Qinghe Li  Erdenedalai Lkhasuren  Jung-in Lee  Ho Sung Jang
Abstract:A new technique of simultaneous inversion for 3-D seismic velocity structure using Pg, Sg, PmP, SmS, Pn and Sn arrival times of 32 events with 404 seismic rays are inverted for locations and crustal structure. These methods are applied to the Central and Southern parts of the Korean Peninsula. 3-D seismic velocity tomography including 8-sections from earth surface to the Moho, 13 profiles along latitude and longitude, and depth distribution was determined. The velocities fluctuate strongly in the upper crust. There are big an-isotrophy bodies near north of Seoul in the upper crust, implying that they may be related to the Chugaryong Rift Zone. They found that there were low velocity bodies beneath the Kyongiu area at the depth 10-15 km, the Youngwol area at the depth 10 km, and the Hongsung area at the depth 5-10 km, indicating that they must be due to the earthquake sources of Kyongju (6/25/1997), Youngwol (12/13/1996), and Hongsung (10/07/1978), respectively. These results are also well consistent with Bouguer gravity anomalies showing very complex and low velocity bodies beneath the Chugaryung Rift Valley and/or deep fault systems and the earthquake hrpocenters, respectively.
Keywords:3D-Velocity tomography  Multi-phase travel-time inversion    Waveforms inversion  Low velocity layer  
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