l1 stu - hslt201 - sortie terrain sismologie objectifs … · 2017-01-19 · • mesures du bruit...
TRANSCRIPT
L1STU-HSLT201-SortieterrainSismologieObjectifs
• Compréhensiondesdifférentesméthodesd’investigation• Priseenmaind’équipementgéophysique–sismique• Miseenplaced’uneétudedesite:méthodes,pratiques
Equipementetmanips
• Mesuresdubruitsismiqueambiantpourestimerlastructuredusous-sol(épaisseurdescouches,vitessesetdensité)
o Equipement:sismomètre3composantes«Tromino»• Mesuresdesismiqueactivepourestimerl’épaisseuretlavitessedesune/deux
premièrescouchessédimentaireso Equipement:flutesismique(24géophonesverticaux),acquisition,masse
• Planificationetcartographiedesmesureso Equipement:cartesetGPS
Localisation:Montpellier,ParcJacquesCœur,HôteldevilledeMontpellier,rdvTramHôteldeVille–Moulares
ShortguideforSoilspyRosina–Activeseismic
• Installthe24geophones(WARNING:Deployandconnectthestreamertothecomputer:
setupàcalibration.Disconnectthestreamer)• Connectthegeophonestothestreamer:theconnectorsareclearlynumberedfrom
oneto24.Becarefulofred/blackcolors• ConnectthestreamertothePCwiththeHUB(connectorsnoted“isolated”)toaUSB
port.• LaunchtheSolspyRosinasoftware• ClicktheLINKbutton(ifproblem:setup//option//virtualcom,trydifferentnumber
ofport-portn°10or11seemok).LINKEDindicatesthatthecommunicationworko Windowwithmultiplerows:geophonenumber,resolution,amplitude,X-Y
distances.Allparameterscanbemodifiedwith«command»//Settrigger:recordingtime,geophonenumber1,modeofacquisition//SetGain:auto,1/t,1/sqrt(t),...//SetGeometry:X-Ydistances,...Clicktovalidate.
• Command//Settriggertofixthepositionofsource(a“T”isindicatedneartheselectedgeophone),thedelayandtherecordingtime
• Command//SetGain• Command//SetGeometry• Choosetheacquisitionfrequency(512Hzisok):inthetaskbarnexttoLINKED.
Differentbuttons:C=continuousmonitoringmode,S=stackingrecordingmode• CreateafoldertosavethedatathenSetup//General//ChangethefolderBydefault:
C:/programfiles(x86)/Micromed/SoilspyRosina/Files/SiteDefaultWarning:“Files”islockedifyouarenottheuserwhoinstalledthesoftware.Youcan’taccesstothedata.CHANGETHEFOLDERFIRST!
• Selectcontinuousmonitoringtoverifyallthegeophones(walkingalongtheprofile)andtestparameterslikethegain
• Fixthethreshold(1mvseemsok)• SelectthemodeSTACKclickingonthe“S”button//trigger//save• Activatethesource:activatethesource,thenumberofstackincreases• Stopacquisition:thedifferenttracesareautomaticallysavedinthecurrentdirectory.
Button“A”=Averagemode:youhavetoopentheacquisitionfilethenyoucanselect/deselecttracescontributingtothefinalaveragedsignal.Theresultoftheselectionisontherightside.Theaveragetraceisautomaticallysavedwhenyoustop.Button“P”=Pickingmode:selectthetrace(rightpanel)andrightclicktopickthefirstarrival.File//savepicking
ShortguideforTromino