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