CAJ | 학술논문

采用现代仪器地震记录和烈度资料,我们建立了用于定量估算历史地震震级和震中位置的烈度衰减模型和分析方法,并对我国西南川滇地区的历史和近代地震的震中和震级进行了重新分析.利用20世纪以来该地区十四个有仪器记录的地震(5.9≤M_s≤8.0)及相应的烈度数据,对其烈度-震级-震中距衰减关系进行标定,并建立了用于震中和震级估算的烈度衰减模型.结果表明,当震级一定时,川滇地区烈度随震中距增大而衰减的速率明显小于美国加州地区(～60%).在衰减模型基础之上,发展了确定震中区域和震级的网格搜索试算方法(GSTSL),并给出了确定震中位置和震级的等值线置信值.采用所建立的分析方法,对1786年康定地震,1850年西昌地震,1913年峨山地震和1970年通海地震进行了分析,给出了更为精确合理的结果.
채용현대의기지진기록화열도자료,아문건립료용우정량고산역사지진진급화진중위치적열도쇠감모형화분석방법,병대아국서남천전지구적역사화근대지진적진중화진급진행료중신분석.이용20세기이래해지구십사개유의기기록적지진(5.9≤M_s≤8.0)급상응적열도수거,대기열도-진급-진중거쇠감관계진행표정,병건립료용우진중화진급고산적열도쇠감모형.결과표명,당진급일정시,천전지구열도수진중거증대이쇠감적속솔명현소우미국가주지구(～60%).재쇠감모형기출지상,발전료학정진중구역화진급적망격수색시산방법(GSTSL),병급출료학정진중위치화진급적등치선치신치.채용소건립적분석방법,대1786년강정지진,1850년서창지진,1913년아산지진화1970년통해지진진행료분석,급출료경위정학합리적결과.
We have estabished an intensity attenuation relationship and analysis method between the epicentrers and magnitudes of historical earthquakes with modern instrumental records and intensity data.With this technique,we have focused our study on Southwest China where there are a lot of moderate or large historical and modern earthquakes occurred since last a few centuries.First,fourteen earthquakes with modern instrumental records with magnitude ranging from M_s 5.9 to 8.0 in this region are used to develop an intensity-magnitude-epicentral distance attenuation relationship.The intensity attenuation relation predicts that,with the same earthquake magnitude,the intensity decreases with distance in this region at a rate about 60% of predicted by the California intensity attenuation model.Based on the intensity attenuation model,we have proposed the Grid Searching of Trial Source Location (GSTSL) method for estimating earthquake magnitudes and bounding epicentral regions,and the confidence value of contours are also calculated.Finally,in order to test the technical strategy we have developed in estimating historical earthquake magnitude and bounding epicentrers.Four typical earthquakes are used in our analysis.They are the 1786 KangDing event,1850 Xichang event,1913 Eshan event and 1970 TongHai event.