基于最邻近事件距离算法的华北地区地震丛集特征研究

发布时间：2018-05-19 12:54

  本文选题：最邻近事件距离算法 + 地震丛集率　； 参考：《大地测量与地球动力学》2017年12期

【摘要】：利用华北地区2007年以来的地震资料,基于最邻近事件距离算法计算地震丛集率,对郯庐、燕山-渤海、河北平原、银川-河套、汾渭、淮河、长江下游-黄海等7个地震带进行地震丛集特征研究。对海城老震区的地震丛集特征分析认为,地震序列的丛集性明显减弱,目前发生的小震可视为反映区域应力状态的背景地震。以2015-04-15内蒙古阿拉善左旗5.8级地震为例,对华北地区显著中强地震前的地震丛集特征进行研究,发现中强地震前,地震丛集率在空间区域上先出现高值,随后出现低值,继而发震,对应地震活动中强震前增强-平静的现象,这一特征对判定未来潜在地震危险区有一定的指示意义。
[Abstract]:Based on the seismic data of North China since 2007, the seismic cluster rate is calculated based on the nearest neighbor event distance algorithm. The seismic cluster rates are calculated for Tanlu, Yanshan-Bohai Sea, Hebei Plain, Yinchuan Hetao, Fenwei, Huaihe River, etc. Seismic cluster characteristics of 7 seismic belts in the lower reaches of the Yangtze River and Huang Hai are studied. Based on the analysis of seismic cluster characteristics in Haicheng old earthquake area, it is concluded that the cluster of earthquake sequences is obviously weakened, and the current small earthquakes can be regarded as background earthquakes reflecting the regional stress state. Taking the M = 5.8 earthquake in Alashan Zuo Banner, Inner Mongolia, from 2015-04-15 as an example, the characteristics of earthquake cluster before the notable moderate strong earthquake in North China are studied. It is found that before the moderate strong earthquake, the earthquake cluster rate first appears high value in the spatial area, and then appears the low value. The subsequent occurrence of earthquakes corresponds to the phenomenon of strengthening-calm before strong earthquakes in seismic activities, which is of certain significance in determining the potential seismic risk areas in the future.
【作者单位】： 山东省地震局;中国地震局地球物理研究所;中国有色金属工业昆明勘察设计研究院;
【基金】：中国地震局地震科技星火计划(XH18026Y) 山东省重点研发计划(2016GSF120011) 山东省地震局重点基金(JJ1704Y)~~
【分类号】：P315
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本文编号：1910179