简介：ＰｈｙｓｉｃａｌｂａｃｋｇｒｏｕｎｄｏｎｅｓｔｉｍａｔｉｎｇｂｖａｌｕｅＷＥＩＱＩＯＮＧＨＵＡＮＧ（黄玮琼）ＷＥＮＸＩＡＮＧＬＩ（李文香）ＩｎｓｔｉｔｕｔｅｏｆＧｅｏｐｈｙｓｉｃｓ，ＳｔａｔｅＳｅｉｓｍｏｌｏｇｉｃａｌＢｕｒｅａｕ，Ｂｅｉｊｉｎ...

简介：ThedatarecordedduringthesitesurveyintheZhangzhouareainFujianProvincebetweenOctober23,2007andDecember3,2007wasanalyzed.Themainmethodsadoptedforthenoiselevelofthisareaarethenoiserootmeansquare(RMS),noisepowerspectrumdensityandnoisecoherencyfunction.Theresultsindicatethatthenoiselevelsofthesurveysitesarehigherinthe1s-10speriods,whichisthemainfrequencybandofpreliminarymicroseism,andalso,twomainnoisesourceswerefoundin1.5Hzandaround5Hz.Accordingtoarithmetic,thedirectionandfrequencybandofthenoisesourcewereanalyzedandacademicproofswerepresented.Atlast,wefoundthatthenoisesourcein1.5Hzwasmadebythewaterwavearousedbythewindinthereservoirregionandthenoisesourcearound5Hzwasmadebythepowerstationinthenortheastdirection

简介：历史的地震活动在北方中国区域是强烈的。然而，自从Ms6.2地震，没有中号的地震在Zhangbei区域在这个区域发生在最后十年在1998。中等、强烈的地震的静止在诺思中国是相当突出的。在这篇论文，我们在1970~使用小地震记录2009学习背景在北方中国区域的地震活动。地震参数的空间分布被介绍，包括b值，最大的大小和M/6的地震的年度出现概率。0。我们有低b值的结果表演区域在太行山块在山西裂缝，位于Tancheng-Lujiang差错地区的Suqian区域和Shijiazhuang区域包括Yuncheng区域。我们seismicity的合成空间模式上的分析显示在北方中国区域的seismicity被深结构的地区性的动态因素主要影响。

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简介：Summarizingtheexistingdataofseismologicalandgeologicalinvestigationsanclorstrongandintermediate-strongearthquakesintheSichuanbasinanditsadjacentareasaccumulatedbytheseismologicalandpetroleumorganizationsinSichuanandoftheresultsofseismicprospectinganddetailedexplorationinChengdudepressionduringthelast20yearspermittednstostudythetypesanddistributionofhiddenstructuresinChengdudepressionanditsadjacentareas,inparticular,toidentifyindetailthe"hiddenfaults"intheChenngdu-Deyangareaontheonehand;TheobtaineddataindicatethattheNE-trendingXinjinfaultrunsnorthwardanddiesoutinthesouthofPenzhentownofShuangiiuCounty.Meanwhile,westudiedgeneticrelationsofseismicactivitytoactivefaultsandtheircorrespondingmovementcharacteristicsontheotherhand.Moreover,thesurfacefaultsanddeep-seatedfaultsareclearlydefinedandoutlined,and5typesofseismogenicfaultssuggested.TheknowledgethusobtainedenablesustodelimitthefocalzonesforpotentialstrongearthquakesinChengdudepression.Thestudysuggeststhatazoneof40kmwideandmorethan100kmlongonsidesalongtheChengdu-Deyanglinehasastableseismogeologicalbackgroundandgoodengineering-seismologicalconditions.

简介：Inthisstudy,theNorthChinaseismicregionwasselectedasthestudyarea,andevaluationofseismichazardusingthespatialsmoothingseismicitymodelwasperformed.Firstly,thestudyareaisdividedintogrids,andsomeparameters(e.g.b-value,M0,Mu,azimuthandM-Lrelationship)foreachseismotectonicmodelwereassigned.Secondly,usingellipticalsmoothingbasedonaseismotectonicbackgroundmodel,thestatisticalearthquakeincidencerateineachgridissuccessivelycalculated.Lastly,therelevantgroundmotionattenuationrelationshipischosentoassessseismichazardofgeneralsites.Themapsforthedistributionofhorizontalpeakgroundaccelerationwith10%probabilityofexceedancein50yearswereobtainedbyusingtheseismichazardanalysismethodbasedongridsource.Thisseismicitymodelsimplifiesthemethodologyofprobabilisticseismichazardanalysis,especiallyappropriateforthoseplaceswhereseismictectonicsisnotyetclearlyknown.Thismethodcanprovidevaluablereferencesforseismiczonationandseismicsafetyassessmentforsignificantengineeringprojects.

简介：UsingGPSobservationsofhorizontalmovementfrom2001to2003andthecross-faultmobileshort-levellingdataof1988～2003,andwiththeaidoftheimprovednegativedislocationmodelandthetime-varyingcurveofstrainintensityratiooffaultdeformation,theregionaltectonicdeformationbackgroundandmedium-andshort-termprecursorsrelatedtothepreparationoftheMinle-ShandanearthquakesofMs6.1andMs5.8onOctober25,2003areinvestigated.Theresultsrevealthat,underthebackgroundofthewide-rangedeformationadjustment,short-termrelaxationandrecoverycausedbytheKuulunMountainsearthquakeofMsS.1,thehypocentersoftheearthquakesarelocatedonthenorthedgeoftheshearstressenhancementzonebetweenthecompressionallockedsegmentsofblockboundaryfault,aplacewhichmayrepresentanacceleratedstrainaccumulation.Anobviousanomalyofstrainintensityratioappearedinshort-levellingmeasurementscrossingoverthefaultattheShihuiyaokousite,theclosesttotheepicenters,3monthsbeforetheoccurrenceoftheearthquakes.Inaddition,thevariationinnumberofanomaliesfrom10-odddaystomonthsbeforetheearthquakesintheentiremonitoringareaandtheanomalyconcentrationandlocalenhancementrelativetonearsourceinthe3monthsbeforetheearthquakesareregardedtobeprecursorstothetwoevents.

简介：AnM=6.0earthquakeoccurredonFebruary23,2001inthewesternSichuanProvince,China.Themacroseismicepicentersituatedinthehighmountain-narrowvalleyregionbetweenYajiangandKangdingcounties.Accordingtofieldinvestigationintheregion,theintensityofepicentralareareachedVIIIandtheareaswithintensityVIII,VIIandVIare180km2,1472km2and3998km2,respectively.TheisoseismalsaregenerallyinellipticshapewithmajoraxistrendingnearN-Sdirection.TheearthquakedestroyedmanybuildingsandproducedsomephenomenaofgroundfailureandmountainousdisastersintheareawithintensityVIII.Thiseventmayberesultedfromlong-termactivitiesoftheLitangfaultandYunongxifault,twomainfaultsinthewesternSichuan.Themovementsbetweenthemainfaultsmadethecruststressadjustedandconcentrated,andfinallytheearthquakeonasecondaryfaultintheblockreleasedaquitelargeenergy.

简介：TheregionaltectonicbackgroundandcharacteristicsofactivefaultsoftheYutianMS7.3earthquakeonFebruary12,2014arediscussedinthispaper.AftertheanalysisoftheepicenterareaoftheMS7.3earthquakein2014andthefocalmechanismsoftheformerstrongearthquakesaroundit,theauthorsdeducedthattheseismogenicfaultoftheMS7.3earthquakeistheeastbranchoftheAshikulefault.TheMS7.3earthquakein2014andtheMS7.3earthquakein2008aretwostrongearthquakeeventsonthedifferentsectionsoftheAltunTaghfault,wherethefaultbehaviorchangesfromsinistralsliptonormalfaultingbecauseoftheextensionaltaileffectsinthesouthernendoftheAltunTaghfault.ItisconcludedthatthetwoMS7.3earthquakeshavethesamedynamicsource,andtheMS7.3earthquakein2008promotedtheoccurrenceoftheMS7.3earthquakein2014.Finally,wecalculatetheCoulombstresschangetotheseismogenicfaultoftheMS7.3earthquakein2014fromtheMS7.3earthquakein2008usingthelayeredcrustmodel.TheresultalsoshowsthattheMS7.3earthquakein2008acceleratedtheoccurrenceoftheMS7.3earthquakein2014.

简介：用地震断层摄影术的最近的结果，我们学习了深构造的背景中等并且在安徽省和它的附近的区域的强震(28°～39°N，112°～124°E)。结果如下：(1)在那里存在在中等强壮的地震，表面的地质的结构并且与上面外壳的速度划分活跃构造元素的地点之间的某个关联组织。记录M≥的大多数地震6.0发生在高速度的地区或在在high-velocityand之间的过渡区域在上地壳的低速度的地区。在低速度的地区的地震活动有更小的影响。发生在高速度的地区的地震主要在速度变化区域被散布。边界带和北方中国平凡断裂地块的内部是中等强壮的地震的主要活跃地点。在在块的西方、北的方面的断层盆地下面，上地壳被宽不连续的分布在low-velocityzone，并且在过渡带描绘从低--到高速度，中等强壮的seismicityshows活断层被开发的显域分布。NW-extensionZhoukou-Hefei-Xuancheng低速度的地区分开DabieshanMountainsand西方山东的高速度的地区--它毗邻thehigh速度地区的北方面上的安徽，和中等强壮的地震是相对经常的。这个低速度的地区可能是在北方中国和华南之间的一条重要、深深地组织的边界构造的省。(2)Thefrequent中等强壮的地震在Huoshan-Lu在过去和最近的小地震活动记录了“一个区域是在在Dabieshan的中央部分和通过外壳切了的深断裂的二个集合下面的中间的外壳中的一个低速度的地区的结果。(3)以深部构造，在安徽省的中等强壮的地震的分发有一个明显的地区性的特征。基于历史的地震复发间隔和深seismogenictectonics的类似物原则，在安徽Provinceare记录M_s5.0的潜在的地震风险地区决定了。