欢迎来到天天文库
浏览记录
ID:55732135
大小:787.42 KB
页数:4页
时间:2020-06-03
《2013年7月22日岷县漳县6.6级地震前地震相关长度增长现象.pdf》由会员上传分享,免费在线阅读,更多相关内容在应用文档-天天文库。
1、第35卷第3期地震工程学报Vo1.35NO.32013年9月CHINAEARTHQUAKEENGINEERINGJOURNALSept.,2013业研究简报芥恭带芥2013年7月22日岷县漳县6.6级地震前地震相关长度增长现象荣代潞,李亚荣(中国地震局兰州地震研究所甘肃兰州730000)摘要:利用单健群分析方法研究了2013年7月22日岷县漳县6.6级地震前地震空间相关长度增长现象。结果表明,从2011年下半年开始主震周围区域地震空间相关长度明显增长。利用这种特征对可能的大震危险区进行网格式搜索,至少可以对未来强震发生的地点进行初步预测。关键词:岷县一
2、漳县6.6级地震;地震空间相关长度;单键群方法(SLC)中图分类号:P315.52文献标志码:A文章编号:1000—0844(2013)03—0455—04DOI:10.3969/j.issn.1000—0844.2013.03.0455AnalysisoftheGrowthPhenomenonofSeismicCorrelationLengthPriortoMinxian-ZhangxianEarthquakeRONGDai—lu,LIYa—rong(LanzhouInstituteofSeismology,ChineseEarthquakeAdmi
3、nistration,Lanzhou。Gansu730000。China)Abstract:TheseismiccorrelationlengthspriortotheMinxian—ZhangxianearthquakeoccurringonJuly22。2013,havebeenstudiedusingthesingle—linkclusteranalysis(SLC)method.ThecatalogsusedweredownloadedfromtheChinaEarthquakeDataCenter(CEDC;http://data.earth
4、quake.cn/data/).Earthquakesthatoccurredduringthefiveyearspriortothemainshockuntilitsorigintimewerelocatedinanareacenteredonthemainshock(34.5N。,104.1oE)witharangeof32。~37。。102。~107。.Weselected2.5(ML)astheminimummagnitudeandverifiedthecompletenessofthecatalogspriortothemainshockus
5、ingtheGudengbergformula-whichshowedgoodresultsabovemagnitudeMI一2.5.Theresultshowsthatanincreaseincorrelationlengthformoderate—sizedearthquakeswasobservednearly1.5yearsbeforethemainshockandcanbefittedwellbythepowerlaw.Forthepreparationandoccurrencestageoftheearthquakeprocesschara
6、cterizedasaself-organizedcriticalphenomenon,directtestingfortheincreaseinspatialcorrelationlengthspriortOlargeearthquakesisanindependentapproachusedtOdetectcriticalpointbehaviorinobservedseismicity.Theresultsofthisstudyshowthattheself—organ—izedcriticalpointcharacteristicwasbeen
7、observedpriortotheMinxian—ZhangxianMs6.6earth—quake.Theresultsfromthemanyearthquakeexamplesindicatethattheincreaseinseismiccorre—lationlengthbythepowerlawrepresentsaphysicalprocessofcritical—pointcharacteristicsinthesourceareainpreparationofthemainearthquake.Inafuturework,thegri
8、dsearchtechniqueis收稿日期:2013—08—12;中国地震局兰州地震研究所论
此文档下载收益归作者所有