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地震 ›› 2018, Vol. 38 ›› Issue (2): 145-156.

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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

武善艺1, 刘琦2, 龚丽文3, 张治广4   

  1. 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
  • 收稿日期:2017-09-26 发布日期:2019-08-15
  • 作者简介:武善艺(1977-),男,甘肃兰州人,工程师,主要从事地震形变资料分析和研究。
  • 基金资助:
    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)

High-Frequency Anormaly Characteristics of Fixed-point Deformation before the 2008 Wenchuan MS8.0 Earthquake

WU Shan-yi1, LIU Qi2, GONG Li-wen3, ZHANG Zhi-guang4   

  1. 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
  • Received:2017-09-26 Published:2019-08-15

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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

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.

Key words: Fixed-point deformation, High frequency abnormal signals, The 2008 Wenchuan MS8.0 earthquake

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