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《用CAP方法反演2010年6月5日山西阳曲Ms4.6地震震源机制解.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第35卷第3期地震工程学报Vo1.35No.32013年9月CHINAEARTHQUAKEENGINEERINGJOURNALSept.,2O13用CAP方法反演2010年6月5日山西阳曲MS4.6地震震源机制解宋美琴,李华明,韩立波。,李丽,王秀文,梁向军(1.山西省地震局,山西太原030021;2.石家庄经济学院,河北石家庄050031;3.中国地震局地球物理研究所,北京100081)摘要:利用CAP方法反演了2010年6月5日阳曲M4.6地震震源机制解,得到震级M为4.5,节面I走向213。、倾角
2、47。、滑动角一161。,节面II走向109。,倾角76。,滑动角一44。,属于倾滑型;精确定位显示震中处于石岭关隆起区,CAP反演和精定位结果推断本次地震的震源深度为17~2Okm。震源机制解节面参数与震中附近的山根底断裂和系舟山西麓断裂产状存在差异,这两条断裂不是阳曲地震的发震断裂,由于现场野外地质考察未发现地表断裂,不排除本次地震为隐伏断层活动的结果。关键词:阳曲4.6级地震;CAP方法;震源机制解;震源深度;发震断裂中图分类号:P315.33文献标志码:A文章编号:1000—0844(2013)
3、03—0692—06DOI:10.3969/j.issn.1000—0844.2013.03.0692FocalMechanismoftheMs4.6YangquEarthquakeofJune5,2010,DeterminedfromtheCAPMethodS()NGMei—qin,IIHua-yne,HANLi_bo。,LILi,WANGXiu—wen,IIANGXiang一)un(1.EarthquakeAdministrationo,fShanxiProvince,TaiyuanShanxi03
4、0021,China:2.ShijiuzhuangUniversityoyEconomics,ShijiazhuangHebei050031,China;3.InstituteofGeophysics,CEA,Beijing100081,China)Abstract:OnJune5,2010,amagnitudeMs4.6earthquakeoccurredintheYangquregion,whichwaslocatedontheShilingguanupliftbetweentheTaiyuanba
5、sinandtheXindingbasinintheShanxirift.ThiswasamoderatelystrongearthquakefeltinYangquandsurroundingareas.TheearthquakerupturedontheShangendifault,whichcontrolledthetectonicactivitiesintheeastsideoftheTaiyuanbasin.Basedontheseismicitydistribution,itappearst
6、hatthisearthquakewasalsolocatedintheseismicgapoftheTaiyuanbasin.Tobetterunderstandtheseismotecton—icsofthisregion,werelocatedthiseventandfurtherstudieditsfocalmechanismbasedonthelO—calbroadbandwaveformdatarecordedbytheregionalseismicnetworkintheShanxiPro
7、vince.Inthiswork,theearthquakewasinitiallyrelocatedbymeansoftheabsoluterelocatingmethod,andthenthefocalmechanismandfocaldepthweredeterminedbythe”CutandPaste”(CAP)method.WeinversedthefocalmechanismusingwaveformsinsevenstationsneartheepicenterwithhighSNRra
8、tiosandclearPwavepolarization,andthestationswereevenlyazimuthallydistribu—ted.Theresultsofthefocalmechanismandfocaldepthweretestifiedbycomparingtheobservedrecordsandthesyntheticwaveforms.TheresultsindicatethattheYangqueart
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