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| GPS揭示的现今地壳运动与地震前兆特征 | |
| 引用本文： | 吴云,孙建中,乔学军,王辉,张燕,施顺英.GPS揭示的现今地壳运动与地震前兆特征[J].大地测量与地球动力学,2003,23(3):14-20. |
| 作者姓名： | 吴云 孙建中 乔学军 王辉 张燕 施顺英 |
| 作者单位： | 1. 中国地震局地震研究所,武汉,430071 2. 中国地震局中国地壳运动观测网络工程中心,北京,100036 3. 中国地震局分析预报中心,北京,100036 |
| 基金项目： | 国家自然科学基金 (4 0 0 740 2 4)课题,“十五”科技攻关计划 2 0 0 1BA60 1B0 2 -0 3 -0 7课题,国家重大科学工程“中国地壳运动观测网络”项目 |
| 摘 要： | 利用“中国地壳运动观测网络”产出的GPS观测资料,采用球坐标系下非连续变形算法对资源进行计算,以此为基础,对我国大陆地块及其边界带运动与形变进行了分析。对GPS基准站的连续观测序列采用小波变换进行分解变换,分析了部分震例,探讨了从GPS连续观测序列提取地震前兆的方法。初步取得两点认识：（1）7级以上的大地震主要发生在走滑运动量大的活动边界,且与高应变率地块有关,这可以作为地震中长期预测判据;（2）GPS基准站连续观测序列中的低频段,地震前6个月或稍长时段有一定的前兆异常出现,这可以作为地震中短期预测判据。 |
| 关 键 词： | 地壳运动 地震前兆 GPS 地震预测 |
| 文章编号： | 1671-5942(2003)03-0014-07 |
| 修稿时间： | 2003年4月3日 |
CHARACTERISTICS OF CURRENT CRUST MOVEMENT AND SEISMIC PRECURSORS REVEALED BY GPS SURVEY |
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| Wu Yun,Sun Jianzhong,Qiao Xuejun,Wang Hui,Zhang Yan and Shi Shunying Institute of Seismology,CSB,Wuhan\ Center of CMONOC,CSB,Beijing\ Center for Analysis and Prediction,CSB,Beijing\.CHARACTERISTICS OF CURRENT CRUST MOVEMENT AND SEISMIC PRECURSORS REVEALED BY GPS SURVEY[J].Journal of Geodesy and Geodynamics,2003,23(3):14-20. | |
| Authors: | Wu Yun Sun Jianzhong Qiao Xuejun Wang Hui Zhang Yan and Shi Shunying Institute of Seismology CSB Wuhan\ Center of CMONOC CSB Beijing\ Center for Analysis and Prediction CSB Beijing\ |
| Institution: | Wu Yun,Sun Jianzhong,Qiao Xuejun,Wang Hui,Zhang Yan and Shi Shunying 1)Institute of Seismology,CSB,Wuhan\ 430077) 2)Center of CMONOC,CSB,Beijing\ 100036 3)Center for Analysis and Prediction,CSB,Beijing\ 100036 |
| Abstract: | In accordance with GPS data produced from "Crust Movement Observation Network of China"(CMONOC), we have computed and analyzed the current motion and deformation of the blocks and their boundaries in the continent of China using "inverse DDA of a block system in the sphere coordinate", made wavelet transformation for the GPS observational sequences at continuously tracing stations and on the basis of analysis of some earthquakes investigated some approaches for abstracting precursory information from the GPS sequences. As a result we have the following recognitions. 1)The earthquakes with magnitude of 7 or over mainly occur on the active boundaries with large striking slip and they are related to the blocks with high strain rates.This would be index of high seismic risk region at long-and-middle time scale. 2) In the continuously observational sequences of GPS, there is some obviously precursory information with low frequencies occurred 6 months or longer before earthquakes, that would be index for the middle-and-short term earthquake prediction. |
| Keywords: | GPS current crust movement earthquake precursor earthquake prediction |
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