简介:ThenorthernmarginoftheSouthChinaSea,asatypicalextensionalcontinentalmargin,hasrelativelystrongintraplateseismicity.ComparedwiththeactivezonesofNanaoIsland,Yangjiang,andHeyuan,seismicityinthePearlRiverEstuaryisrelativelylow.However,aML4.0earthquakein2006occurrednearDanganIsland(DI)offshoreHongKong,andthissitewasadjacenttothesourceofthehistoricalM5.8earthquakein1874.TorevealtheseismogenicmechanismofintraplateearthquakesinDI,wesystematicallyanalyzedthestructuralcharacteristicsinthesourceareaofthe2006DIearthquakeusingintegrated24-channelseismicprofiles,onshore–offshorewide-angleseismictomography,andnaturalearthquakeparameters.WeascertainedthelocationsofNW-andNE-trendingfaultsintheDIseaandfoundthattheNE-trendingDIfaultmainlydippedsoutheastatahighangleandcutthroughthecrustwithanobviouslow-velocityanomaly.TheNW-trendingfaultdippedsouthwestwithasimilarhighangle.The2006DIearthquakewasadjacenttotheintersectionoftheNE-andNW-trendingfaults,whichsuggestedthattheintersectionofthetwofaultswithdifferentstrikescouldprovideafavorableconditionforthegenerationandtriggeringofintraplateearthquakes.Crustalvelocitymodelshowedthatthehigh-velocityanomalywasimagedinthewestofDI,butadistinctentitywithlow-velocityanomalyintheuppercrustandhigh-velocityanomalyinthelowercrustwasfoundinthesouthofDI.Boththe1874and2006DIearthquakesoccurredalongtheedgeofthedistinctentity.Twoverticalcross-sectionsnearlyperpendiculartothestrikesoftheintersectingfaultsrevealedgoodspatialcorrelationsbetweenthe2006DIearthquakeandthelowtohighspeedtransitioninthedistinctentity.Thisresultindicatedthatthetransitionalzonemightbeaweaklystructuralbodythatcanstorestrainenergyandreleaseitasabrittlefailure,resultinginanearthquake-pronearea.
简介:摘要成都地铁1号线南延线四河站由单岛双线车站变为双岛四线车站,车站方案需同时满足初期主线与支线贯通运营、近期主线与支线采用主支线Y型交路运营、远期支线继续延长进而拆分为独立运营线路的各种条件;车站站厅层、站台层公共区及设备区的布置,以及防火防烟分区、消防疏散的计算均须满足规范要求。
简介:摘要近年来,随着社会经济的发展,人们对于电力的需求逐年增加。因此,多用户多用电持续增加的同时,用电安全成为我们需要密切关注的重要因素,为确保用电的绝对安全,确保线损的最小化,电力营销中的质量管理至关重要,科学有效的管理和切实可行的策略不但是提高电力企业经济效益的关键,也是对电力企业高效管理和预防不良现象的出现的关键。但是,从近年来电力企业的管理现状和实际的管理效果来看,总是出现一定的问题,总是存在一定的麻烦,因此,加强对电力营销线损精细化管理的是关键。本文在分析了对线损异常的原因进行了分析,对精细化管理的有效措施进行了一定的说明和阐述,希望能对企业更好的管理,更好的经济效益的增长带来一定的帮助。
简介:哈尔滨地铁1号线一、二期工程列车最高驾驶等级模式为点联式下的自动驾驶模式(ATO)时,出现过对标异常的故障。以哈1线为例通过实例分析,讲解车载ATO停车原理及电、空转换时的转换机制,分析产生对标准的具体原因,提出解决方案。