Download - 70 Years of Seismology at DTM - captioned Years of Seismology at DTM...70 Years of Seismology at DTM Shaun Hardy and Louis Brown Carnegie Institution for Science Neighborhood Lecture

70YearsofSeismologyatDTM

ShaunHardyandLouisBrownCarnegieInstitutionforScience

NeighborhoodLectureSeriesApril25,2019

1948

DTMseismictruckwithinstrumentsforrecordingwavesfrom“artificialearthquakes.”ControlledexplosionsweresetoffacrosstheMid-AtlanticregiontoprobeEarth’scrust.

HypotheticalcrustalstructurebeneathWashingtonDCfromDTM’searliestexplosionseismologyexperiments.

1948

DetonationofdepthchargefromaCoastGuardcutterinPugetSoundduringjointDTM-GLseismicexperiment.

1951

SeismicequipmentsetuponarailroadflatcarduringDTM’sseismicexpeditiontoAlaskaandYukonTerritory.

1955

TruckwithseismicequipmentandradioreceiverdeployedinPeruduringtheCarnegieAndesExpedition.

1957

Explosionsetoffinanopen-pitcoppermineinPeruforCarnegie’sseismologicalstudiesoftheAndes

duringtheInternationalGeophysicalYear.

1957

DTMcooperativeseismicnetworkforthestudyoflocalearthquakes.Nineteenstationswereinstalled

inPeru,Bolivia,andChile.

1960

1962

Short-periodverticalseismographdesignedbyDTMforuseinSouthAmericanseismicnetwork.Datacouldberecordedforuptooneweekwithoutintervention.

1963

DTM-builthorizontal-motionseismometerusedinSouthAmericanseismicnetwork.

1963

SouthAmericanscientistsatDTMfora2-monthlongintensiveseminardetermineearthquakeepicenters

usinga“ping-pongtable”analogcomputer.

1966

Firstbroad-band,largedynamicrangeseismometerdesignedatDTMbySelwynSacks.

1971

AlanLinde,SelwynSacks,andShigeji Suyehiro searchforseismiceventsonDTMbroadbandseismographtapes.

1971

SelwynSacks,Shigeji Suyehiro,andMichaelSeemann assembleaboreholestrainmeter – adevicedevelopedbySacksandDale

Evertson formeasuringminutedeformationintheEarth.

InstallingDTMboreholestrainmeters atMatsushiroObservatory,Japan(1971)and3.2kmunderground

inaSouthAfricangoldmine(1978).

1970s

1978

Strainrecordofa“slow”earthquakesequenceinJapan– undetectablewithseismometersbutrecorded

byDTMboreholestrainmeters (AlanLindeetal.)

1994

DTM’sPaulSilver(shownhereinBolivia)andcolleaguespioneeredthedeploymentofmodern,portable

broadbandseismicarrays.

Iceland1995

Zimbabwe1997

Galapagos2000

SouthAfrica1998

SouthAfrica1997

Broadbandseismometerinstallationsaroundtheworldby DTMscientistsandcollaborators.

1990s

Brazil1993

1997

MantleplumebeneathIcelandimagedbyseismictomographyfromtheICEMELTexperiment(CecilyWolfeetal.)

1997

“Huddletest”of40three-componentbroadbandseismometersinDTMtestingfacility(RodGreen,

RandyKuehnel,AdrianaKuehnel)

1800-kmlongseismicarrayforstudyofthedeepstructureoftheKaapvaal CratoninsouthernAfrica

(DavidJames,PaulSilver,etal.)

1997

2014

DianaRomandeploysaBENTO2seismic-monitoringboxatHeklaVolcano,Iceland.Satellitetelemetryenablescontinuousmonitoringofvolcanoesinremoteareas.

2016

LaraWagnerwithaCarnegieQuickDeployBox(QDB)–anew,portablebroadbandseismometersmallandlight

enoughtobecheckedasairlineluggage.

2019

DTMfieldseismologistStevenGoldentestsanewbroadbandseismometerforarraydeploymentonVanuatu.