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| 2008年汶川MS8.0地震前定点形变高频异常特征的研究 | |
| 引用本文： | 武善艺,刘琦,龚丽文,张治广.2008年汶川MS8.0地震前定点形变高频异常特征的研究[J].地震,2018,38(2):145-156. |
| 作者姓名： | 武善艺 刘琦 龚丽文 张治广 |
| 作者单位： | 1.甘肃省地震局, 甘肃 兰州 730000; 2.中国地震局地震预测研究所, 北京 100036; 3.重庆市地震局, 重庆 401147; 4.新疆维吾尔族自治区地震局, 新疆 乌鲁木齐 830011 |
| 基金项目： | 甘肃省地震局科技发展基金(2016Y02), 中国地震局震情跟踪重点任务(2016030507), 中国地震局震情跟踪青年任务(2017010226) |
| 摘 要： | 本文以中国大陆西部定点形变观测资料作为研究对象, 采用S变换和超限率时频分析法对其进行了处理和分析。 研究结果表明: 在2008年汶川MS8.0地震前, 距离震中600 km范围内的定点形变个别台站观测到高频异常, 异常持续时间较长; 距离震中300 km范围的个别台站临震高频异常非常显著; 并且不同的定点形变观测手段对高频信号的响应不同, 地倾斜测项临震前高频异常形态较地应变测项更为清晰灵敏。 同时S变换和超限率两种方法处理结果具有较好的一致性, 表明本文提取到的高频异常可信度较高。 |
| 关 键 词： | 定点形变 高频异常 S变换 2008年汶川MS8.0地震 |
| 收稿时间： | 2017-09-26 |
High-Frequency Anormaly Characteristics of Fixed-point Deformation before the 2008 Wenchuan MS8.0 Earthquake |
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| WU Shan-yi,LIU Qi,GONG Li-wen,ZHANG Zhi-guang.High-Frequency Anormaly Characteristics of Fixed-point Deformation before the 2008 Wenchuan MS8.0 Earthquake[J].Earthquake,2018,38(2):145-156. | |
| Authors: | WU Shan-yi LIU Qi GONG Li-wen ZHANG Zhi-guang |
| Institution: | 1.Earthquake Administration of Gansu Province, Lanzhou 730000, China; 2.Institute of Earthquake Science, CEA, Beijing 100036, China; 3.Earthquake Administration of Chongqing, Chongqing 401147, China; 4.Earthquake Administration of Xinjiang Uygur Autonomous Region, Urumqi 830011, China |
| Abstract: | In this article,the fixed point deformation data of the west Chinese mainland had been analyzed by the analytical method of S transformation and overrun rate. The results show that abnormal signals with high frequency had been observed by some fixed-point deformation stations in the area of 600 km from the epicenter before the 2008 Wenchuan MS8.0 earthquake and had lasted a longer time. The short-term and impending high-frequency anomalies are obvious in the area 300 km from the epicenter. In addition, the responses to high-frequency signals are not the same for different fixed-point derformation approach. Usually, high-frequency anomaly patterns of ground tilt are more sensitive and clear than crustal strain. Meanwhile, the results of S transformation and overrun rate analyses have good consistency, which indicates the reliablity of the extracted high-frequency anomaly. |
| Keywords: | Fixed-point deformation High frequency abnormal signals The 2008 Wenchuan MS8 0 earthquake |
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