首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到10条相似文献,搜索用时 15 毫秒
1.
IntroductionInassessingtheprobabilitiesoftime-dependentandlong-termseismichazardsforsegmentsofactivefaults,itisnecessarytohavetheprobabilitydensity,f(O,fordescribingtherecurrenceintervaldistributionforsegment-rupturingearthquakes.Fromf(nandthefollowingequation,theconditionalprobability,pc,whichincreaseswiththetime,Te,elapsedsincethelatestearthquake,isabletobecalculated(Nishenko,Buland,1987,WorkingGrouponCaliforniaEarthquakeProbabilities,1995;Wen,1995,1998)fwhereATisthetimeintervalforthefor…  相似文献   

2.
LINTRODUCTIONJinghongHydraulicPowerPlant,locatedintheload,erreachesofLanchangmyer,trib.ofMekong,isintheNorthOfJinghongCity.Thepowerstationisamultipurposehydro-junction,includingelectricpowergeneration,shipping,floodcontrol,cultivahonandwatersupply.SimaoPort,animportanttransportcenterinSimaoDistriCt,YunnanProvince,isabollt80kmaamsuPStreamofthedam.Anerthereservoirisimpounded,thewaterstagewillriseandagreatamountofsedimentwillbedepositedintheriverbedinevitably.Asaresult,itisverylikelyt…  相似文献   

3.
IntroductionTheYanqing-Huailaibasin,whichconsistsoftheYanqing-FanshanandHuailai-Zhuolusub-basins,ismainlycontrolledbythenorthboundaryfaultsofthesub-basins.AsabasictectonicunitattheintersectionofthenortheasternendoftheNNE-trendingShanxigrabensystemandtheNW-trendingZhangjiakou-Penglaifaultzone,ithaskepttheintensivetectonicactivityintheQuaternary(YANG,1982;XU,DENG,1988;XU,MA,1992;FANG,etal,1993;Pavlides,etal,1999).Overthepastdecade,manyresearchershaveconductedstudiesonthedetailedstr…  相似文献   

4.
IntroductionChinesemainlandliesinthesoutheastofEurasianPlateandisclampedbyindian,PacificandPhilippineSeaPlates.Besides,itislocatedatbetweenthetwobigseismicactivebeltsintheworldatthesametime.Differingfromtheshowoftwobigseismicbeltswhichhaveseismiczonaldistributionalongplateboundary,Chinesemainlandanditsperipheralareahaveapeculiarcharacter,expressingseismicallylargestrength,highfrequency,widedistribution,shallowfocus,seriousdamage,multiplestyles,extremelynonuniformspace-timedistributionandsoo…  相似文献   

5.
IntroductionInrecent2oyears,throughstudiesofthegreatearthquakesoftheChinesemainlandanditSvicinitysincel9OO,itiswidelyrecognizedthattheseeventSoccurredinsomeregionsinarelativelyconcentratingmannerfordifferentperiods(Ma,Zhang,l986;Zhang,etal,l994,Hong,l994;Hong,elal,l997;Huang,Dong,l997).Inthispapef,wecallthemmajorregionsofgreatearthquakesincertaintime,ormajorregionsinshort.Themajorregionsofdifferentperiodscanmigratethroughlongdistanceinspace.Thegeneralpatternofthegreatearthquakedistributio…  相似文献   

6.
In the past, domestic and abroad scientific workers have done a great number of researches of experiment forthe relationship between electrical resistivity change and stress on rock (Geoelectric Testing Group, Department ofGeophysics, Peking University and Research Division, Seismological Brigade of Lanzhou, 1978; Zhang, 1981;Chen, et al, 1983, Zhao, et al, 1983, Zhang, Lu, 1983; Zhang, et al, 1985; Brace, Orange, 1968, Kurite, 1986;Teisseyre, 1989), such as simulating the dynamic cour…  相似文献   

7.
I.INTRODUCTIONMechanicsofsedimenttransportisabranchofbasictechnicalscienceinwhichtheprocessesoferosion,transportationanddepositionofsedimenttakeplaceunderactionofgravity,flowingwater,waveandwind.Microscopically,incipientmotion,rolling,sliding,saltationandsuspensionofindividualsedimentparticlesdependonthephysicalproperties,mineralcompositionoftheparticleandcharacteristicsofthenowandboundaryconditions.Macroscopically,sedimentmotionresultsingeomorphologicalevolution,fluvialprocessandenvironm…  相似文献   

8.
IntroductionIncurrentstudiesofnewactivityofafault,orthecrustmovementandtheeallhdynamics,moreat'tentionshavebeenpaidonthedegassingactivities,andtheutilizationofGPStechniqueandtheseismicitydata(Kan,etal,1979,Li,etal,1993;1998).Beforetheoccurrenceofalargeearthquake,thegassesinnertheearthwillstronglyreleasealongthefaultduetotheactionofthetectonicstressfield.Suchphenomenahasbeendiscoveredandreportedintheearly1970s(Cat,etal,1980).Sincethe1980s,thetechniqueoffaultgashasbeendevelopedrapidlyandthegr…  相似文献   

9.
IntroductionManystudies(Kan,etal,1977;Cheng,1981;Xu,etal,1987;Xie,etal,1993,Mulled,etal,1997)indicatedthatthedirectionsofcrustaltectonicstresseshaveregionalvariation.SimpleanalysesbymeansOfthreeprincipalaxesoffocalmechanismsolutions,whichexpressedasP...  相似文献   

10.
The hierarchically organized laminae, bundles, bundlesets and superbundlesets which correspond to a sub-Milankovitch, obliquity or precession, eccentricity and long eccentricity cyclothems, respectively, have been distinguished from the Upper Devonian Fras-nian-Famennian (F-F) transitional carbonate successions deposited in the carbonate-basin and slope facies of Guangxi, South China. The durations of cyclothems are 8000-10000a, 16667a or 33333a, 100000a and 400000a, respectively. The ratio of eccentricity to precession, eccentricity to obliquity, and long eccentricity to eccentricity is 1 : 6, 1 : 3 and 1 : 4 in the Devonian, respectively. Orbital cyclostratigraphical studies show that the durations of the conodont falsio-valis Zone, transitans Zone, punctate Zone, Lower hassi Zone, Upper hassi Zone, jamieae Zone, Lower rhenana Zone, Upper rhenana Zone, linguiformis Zone, Lower triangularis Zone, Middle triangularis Zone and Upper triangularis Zone are 0.4, 0.4, 0.4, 0.3, 0.4, 0.2, 0.8, 0.6, 0.8, 0.3, 0  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号