新疆新源、和静交界M_S6.6地震前形变异常
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摘要
主要研究2012年6月30日新源、和静6.6级地震前,震中附近的观测台站观测到了丰富的趋势异常和部分中短期异常。分析结果表明,①震前存在9项趋势转折异常,异常比例为40.9%,这些异常时间上具有同步性,这表明,震前背景性异常突出;②震前观测到6项中短期前兆异常,异常比例仅为27.3%,中短期异常主要分布在200～300 km范围内;③石场、精河水平摆、榆树沟水管、阜康伸缩仪和克拉玛依钻孔倾斜记录到的中短期异常,其共同特点是异常幅度大,克拉玛依出现的突变异常具有短临异常性质,部分中短期异常具有重复性。
Medium-short term and trend anomalies were recorded by observation station before earthquake with MS6.6 on June 30th,2012.The result shows: ① about nine trend anomalies are synchronism before earthquake,the percentage of anomaly is about 40.9% which indicates background anomaly is outstanding;② about six medium-short term anomalies mainly located at range of 200-300 km around the epicenter,the percentage of anomaly is about 27.3%;③ medium-short term anomalies were recorded in Shichang、Jinghe、Yushugou、Fukang and Karamay station,the common features of these anomalies are with a large amplitude and part of them have repeatability.Abrupt change appeared in Karamay station showed short term anmaly.
Medium-short term and trend anomalies were recorded by observation station before earthquake with MS6.6 on June 30th,2012.The result shows: ① about nine trend anomalies are synchronism before earthquake,the percentage of anomaly is about 40.9% which indicates background anomaly is outstanding;② about six medium-short term anomalies mainly located at range of 200-300 km around the epicenter,the percentage of anomaly is about 27.3%;③ medium-short term anomalies were recorded in Shichang、Jinghe、Yushugou、Fukang and Karamay station,the common features of these anomalies are with a large amplitude and part of them have repeatability.Abrupt change appeared in Karamay station showed short term anmaly.
引文
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[3]杨又陵,张翼.2003年2月14日石河子M5.4地震地形变异常及其演化分析[J].内陆地震,2005,19(3):241-248.
[4]杨又陵,高国英.北天山西段中强地震前地倾斜异常的演化分析[J].大地测量与地球动力学,2005,25(3):98-101.
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[8]中国地震局监测预报司.地形变测量[M].北京:地震出版社,2008.
[9]中国地震局监测预报司.汶川8.0级地震科学研究报告[M].北京:地震出版社,2009.
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