本文選題：最鄰近事件距離算法 + 地震叢集率��； 參考：《大地測量與地球動力學》2017年12期

【摘要】：利用華北地區(qū)2007年以來的地震資料,基于最鄰近事件距離算法計算地震叢集率,對郯廬、燕山-渤海、河北平原、銀川-河套、汾渭、淮河、長江下游-黃海等7個地震帶進行地震叢集特征研究。對海城老震區(qū)的地震叢集特征分析認為,地震序列的叢集性明顯減弱,目前發(fā)生的小震可視為反映區(qū)域應力狀態(tài)的背景地震。以2015-04-15內蒙古阿拉善左旗5.8級地震為例,對華北地區(qū)顯著中強地震前的地震叢集特征進行研究,發(fā)現(xiàn)中強地震前,地震叢集率在空間區(qū)域上先出現(xiàn)高值,隨后出現(xiàn)低值,繼而發(fā)震,對應地震活動中強震前增強-平靜的現(xiàn)象,這一特征對判定未來潛在地震危險區(qū)有一定的指示意義。
[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.
【作者單位】： 山東省地震局;中國地震局地球物理研究所;中國有色金屬工業(yè)昆明勘察設計研究院;
【基金】：中國地震局地震科技星火計劃(XH18026Y) 山東省重點研發(fā)計劃(2016GSF120011) 山東省地震局重點基金(JJ1704Y)~~
【分類號】：P315
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本文編號：1910179