摘要
2012年6月1日阿克陶5.0级地震后,新疆乌恰—喀什地区5级以上地震一直处于平静状态,截止2016年11月25日,平静持续长达1 639天,是该区域自1950年以来第2超长平静。对乌恰—喀什地区5级地震平静异常进行追溯分析,获取其异常指标,结果表明:(1)当该区域地震活跃期内出现发震时间间隔Δt≥524天的异常时,该异常与其后乌恰—喀什6级以上地震有很好的对应关系。(2)乌恰—喀什地区此次超长平静被2016年11月25日阿克陶6.7级地震直接打破,阿克陶6.7级地震对应于该区5级地震平静异常。分析结果可以为正确了解该区5级地震平静异常特征以及地震趋势研判提供参考依据。
It appeared seismic anomaly quiescence after Aketao earthquake( M = 5. 0),June 1 st,2012,in Wuqia-Kashi region. The quiescence time for the earthquakes with M≥5. 0 continued for 1639 days by the end of November 25 th,2016,which was second long quiescence since 1950. We did retrospective analysis on the quiescence anomalies of earthquakes with M≥5. 0 in Wuqia-Kashi region,and obtained the anomaly index of seismic quiescence. The results showed that:( 1) when the abnormal occurrence time interval( Δt≥524 days) in the seismic active period appeared,there was a good corresponding relationship between the anomaly and earthquakes with M≥6. 0 in WuqiaKashi region.( 2) Aketao earthquake( M = 6. 7),November 25 th,2016,directly break the state of M≥5. 0 long quiescence,earthquake with MS6. 7 corresponded to this quiescence anomaly of earthquakes with M≥5. 0. The results can provide references for correct understanding of abnormal characteristics of M≥5. 0 earthquake quiescence and the prediction for seismic trend.
出处
《内陆地震》
2017年第4期353-360,共8页
Inland Earthquake
基金
新疆地震科学基金(201404)
中国地震局震情跟踪定向工作任务(2015010122)资助
关键词
地震平静
异常指标
中强地震
乌恰—喀什地区
Seismic quiescence
Anormaly index
Moderate strong earthquakes
Wuqia-Kashi region
