简介:OnApril20th,2013,anearthquakeofmagnitudeMW6.6occurredatLushanofSichuanonthesouthernsegmentoftheLongmenshanfaultzone,withnotypicalcoseismicsurfacerupture.Thisworkplottedanisoseismalmapoftheearthquakeafterrepositioningover400post–earthquakemacro–damagesurveypointsfrompeakgroundacceleration(PGA)datarecordedbytheSichuanDigitalStrongEarthquakeNetwork.ThismapindicatesthattheLushanearthquakehasadamageintensityofIXontheLieduscale,andthatthemeizoseismalareadisplaysanoblateellipsoidshape,withitslongitudinalaxisintheNEdirection.Noobviousdirectivitywasdetected.Furthermore,therepositioningresultsof3323earlyaftershocks,seismicreflectionprofilesandfocalmechanismsolutionssuggeststhatthemajorseismogenicstructureoftheearthquakewastheDayiFault,whichpartlydefinestheeasternMengshanMountain.ThisearthquakeresultedfromthethrustingoftheDayiFault,andcausedshorteningofthesouthernsegmentoftheLongmenshanintheNW–SEdirection.CoseismalrupturewasalsoproducedinthedeepoftheXinkaidianFault.Basedontheaboveseismogenicmodelandthepresentationofcoseismicsurfacedeformation,itisspeculatedthatthereisariskofmoremajorearthquakesoccurringinthisregion.更多还原
简介:The10thCoalGeologyConference,jointlyorganizedbytheFacultyofScienceoftheCharlesUniversityinPrague,theCzechGeologicalSurveyandtheInstituteofGeologyoftheAcademyofSciencesoftheCzechRepublic,tookplaceinJune7-11,2004,attheFacultyofScience.Thecoalgeologyconferenceshavebeenheldatthefacultyeverythreeorfouryearssince1972.Theywereprecededbycoalgeologyseminarswhichbeganevenearlier,inJanuary1968.Theseseminarsandconferencesprovidedanexcellentopportunitytoexchangeknowledgeandnewinformationoncoalgeologyandrelatedfieldsand,aboveall,tobringtogetherpeoplefromvariousfieldsstartingwithscienceandendingupwithawidespectrumofinterests.