基于和达法分析2012年新源、和静交界M_(S)6.6地震波速比变化特征  

Analysis of velocity ratio variation characteristics of the 2012 Xinyuan-Hejing M_(S)6.6 earthquake by the Wadati method

作　　者：帕肉合·卡依提 南芳芳 潘振生 PAROUHE Kayiti;NAN Fangfang;PAN Zhensheng(Aksu Central Seismic Station,the Xinjiang Uygur Autonomous Region 843000,China)

机构地区：[1]阿克苏地震监测中心站,新疆维吾尔自治区843000

出　　处：《地震地磁观测与研究》2024年第3期23-30,共8页Seismological and Geomagnetic Observation and Research

基　　金：新疆地震科学基金课题(项目编号:201816)。

摘　　要：基于新疆地震台网观测报告,利用多台和单台和达法对2012年6月30日新源、和静交界M_(S)6.6地震前后波速比变化特征进行分析。结果显示:①多台和达法结果显示,在新源、和静交界M_(S)6.6地震前,震中周围区域波速比出现低值异常,震后恢复正常值;②单台和达法计算结果表明,波速比异常台站主要分布在震中附近西部和北部,异常形态以高低值突跳为主,仅持续11天时间;③由台站不同方位的地震波速比计算结果可知,波速比历经低值异常—恢复—发震的演变过程。由此证明,波速比变化与未来强震孕育关系密切。Based on the digital seismic observation reports of seismic stations in Xinjiang,we analyze the variation of wave velocity ratio before and after the M_(S)6.6 earthquake at the junction of Xinyuan and Hejing in 2012 using the Wadati method of single station and the multiple-station.According to the results,①The multi-station Hodges method revealed that before the M_(S)6.6 earthquake at the boundary of Xinyuan and Hejing,there was a low-value anomaly in the wave velocity ratio in the epicentral region,which returned to normal after the earthquake;②The single-station Hodges method calculation results indicated that the stations with abnormal wave velocity ratios were mainly distributed in the west and north of the epicenter,and the abnormal pattern was primarily characterized by high-low value jumps,lasting only 11 days;③According to calculated velocity ratio in different directions of the stations,velocity ratio anomalies show a typical evolutionary process of abnormally low value-resumption-earthquake.Therefore,seismic velocity ratio anomalies before earthquake may be closely related to the seismogenic zone of strong earthquakes.

关 键 词：波速比异常 单台多震和达法 新源、和静交界M_(S)6.6地震 

分 类 号：P315.7[天文地球—地震学]