SeismicRecordingStation
TA_D63A
SummaryReport
ThankyouforhostingstationTA_D63Aonyour
property.Wehopethatyoufindtheenclosed
reportinteresting.
Yourstationisoneofthe2000USArrayseismic
stationsbeinginstalledaspartoftheNational
ScienceFoundation'sEarthScopeinitiative.
Researchscientistsareanalyzingthedatathat
wasrecordedatyourstationtolearnhow
earthquakesareinitiatedandtogainabetter
understandingofourdeepearth'sdynamic
structureandprocesses.
Thisstationdetected121regionalearthquakes
and1372distantearthquakes(occurringover
10degreesor1100kmfromthestation).The
magnitudesoftheseearthquakesrangedfrom
verysmall(magnitude<2.0)whicharenotfelt
byhumansanywhere,tolargeeventswhichcan
resultinsignificantdestruction.(Onthefollowing
pages,wepresentasummaryreportofthedata
weobtainedfromthisstation.)
Weinviteyoutocontinuefollowingtheprogress
ofUSArraybyvisitingtheUSArraywebpagesat
http://earthscope.org/observatories/usarrayand
http://usarray.org
Onceagain,thescientificcommunityisgrateful
foryourwillingnesstoparticipateinthis
researchinitiativeandthankyouforcontributing
tothesuccessofEarthScopeandtheUSArray
project.
Stationsummary
Network
TA
StationID
D63A
Location
Stockholm,ME,USA
Latitude
47.04
Longitude
-68.11
Elevation
0.256km
InstallationDate
Thu,19Sep201300:00:00GMT
RemovalDate
Wed,16Sep201516:56:22GMT
CommunicationsType
CellModem
CommunicationsProvider
Verizon
DataloggerModel
ReportgeneratedattheArrayNetworkFacility(ANF)
onWed,16Sep201516:56:23UTC
Formversion2.0
SensorModel
779
SensorModel
H110900283
SensorModel
4596404
2
USArrayDeploymentPlan
TheTransportableArraynetworkwasstartedinCaliforniainJune2004,andwillmoveeastward,reachingtheeastcoastof
Mainein2013.Followingtheinstallationofthe400thstationinAugust2007,thewesternmoststationsarebeingremovedand
theseismometersshippedforre-installationonthenextportionofthearray.INSET:Theredtriangleonthemapshowsthe
regionallocationofTA_D63A.Otherstationslocatedwithin220km(~130miles)ofthisstationareshownbyblacktriangles.
ThemapoftheUnitedStatesshowsthelocationofthestationsthatcomprisedtheUSArrayprojecton09/01/2015,whenstation
TA_D63Awasoperational.ThelegendliststheregionalseismicnetworksthatcontributedtotheUSArraynetworkatthattime.
StationsrepresentedbythebluediamondsarepartoftheAdvancedNationalSeismicSystemandareoperatedbytheUnited
StatesGeologicalSurvey.StationsinthePacificNorthwestwereredeployedaspartoftheCascadiaProject.
3
HowareEarthquakeDatacollected?
Anearthquakegeneratesseismicwavesthattravelviamanypathsthroughtheearthtotherecordingstation(seefigurelowerright
below).Seismicwavesarerecordedusingaseismometer,whichislinkedtoadataacquisitionsystemwhichrecordsandalso
transmitsthedatainrealtimetotheArrayNetworkFacilityinSanDiego,California,viasatellite,cellphone,ortheInternet.Thedata
arearchived,indexed,andthenprocessedbycomputers.Trainedseismologistsconductfinalanalysesandinterpretationsofthe
seismicdata.Theresultingseismicdataproductsarestudiedbytheseismologicalcommunityformanyresearchendeavors.
Thisdiagramillustratesthesequenceofeventsfromthetimeanearthquakeoccursuntilthedataarestoredinthe
computerizedseismicdataarchive.Notethatthewavebetweentheearthquakeandtherecordingstationdoesnotrepresent
howanactualseismicwavetravelsthroughtheearth.
Whatareseismograms?
SeismogramsshowhowtheEarthmovesataspecificlocationastimepasses,andareusedtodeterminethelocationandmagnitude
(size)ofanearthquake.Three-componentseismometers,likethatusedatyourseismicstation,simultaneouslyrecordmotioninthe
verticalandhorizontaldirections.SeismogramsshowhowtheEarthmovesataspecificlocationastimepasses.Thehorizontalaxis
oftheseismogramsbelowshowtime.Inthiscasetimemarksareshownevery10minutes.Theverticalaxisshowsthedirectionof
groundmovement,i.e.verticalmovementisshownonBHZ,horizontalmotioninthenorth/southdirectiononBHNandhorizontal
motionintheeast/westdirectiononBHE.TheexamplebelowshowsgroundmotionrecordedatanotherUSArraystation(TA_C07A)
fromamagnitude7.2earthquakethatoccurredonDecember19,2007,intheAleutianIslandsatadepthof56km.Theorigintimeof
theearthquake(O)andthearrivaloftheP,SandSurfacewavesareindicated.NotethatSurfacewavescanbeoftwotypes,
horizontalLovewaves(L)andRayleighwaves(R)whichmovebothinthehorizontalandverticalplanes.Damagetostructures
usuallyoccursfromshakingofthegroundduetoSorSurfacewaveswhichproducethelargestmotion.
Whentheseismographdoesnotdetectanymovementcausedbyanearthquake,theseismogramshowsarelativelyflatline.
However,theseinstrumentsareextremelysensitiveandgroundmotionfromlocalsourcessuchaswind,traffic,animals,people,and
oceanwaves,willoftenberecordedandappearassmallwigglesornoiseinaseismogram.
Cross-sectionoftheEarth,showingthe
propagationofseismicwavesindicated
intheseismogramstotheleft.
4
RegionalEventsRecordedatStationTA_D63A
StationTA_D63Arecorded121regional(within1100km)eventsduringitsoperation.Thegraphshowshowmanyearthquakes
occurredwithingivendistancesfromthisstation.Theseismogramsatthebottomofthepageareanexampleofaregional
earthquakerecordedbythisstation.
RegionalEvents
RegionaleventsdetectedbystationTA_D63A.The
sizeoftheorangesquaresisproportionaltothe
magnitudeoftheevent.StationTA_D63Aisshown
bytheredtriangle.
Thischartshowsthenumberofregionalearthquakesthatoccurredata
givendistancefromstationTA_D63A.Thedistanceisgivenin1degree
incrementswhichcorrespondstoadistanceof110km.
SeismogramofaRegionalEvent
Threecomponentsrecordedfromthemagnituderegionaleventdetectedbystation
TA_D63Aon11/04/2013(7:45:10.000UTC).Thisoccurredapproximately195km
fromthestation.Thefirstseismicwaves(Pwaves)arrivedatthisstation31seconds
aftertheeventoccurred.
ThelocationofstationTA_D63Ais
shownbytheredtriangle;thewhitestar
depictsthelocationonthesurface
directlyabovetheearthquake.
5
DistantEventsRecordedatStationTA_D63A
TheseismographatstationTA_D63Arecorded1372distantevents(occurringover10degreesor1100kmfromthestation)during
itsoperation.Theseeventsareshownonthemapbelow.Thegraphtotherightshowshowmanyearthquakesoccurredwithingiven
distancesfromthisstation.Atthebottomofthepageareseismogramsfromadistantearthquakerecordedatyourstation.Themap
totheleftoftheseismogramshowsthelocationofthestationandtheearthquake.
Forcomparison,thelargeSumatraearthquakethatoccurredonDecember26,2004,hadamagnitudeof9.1.Thiswasthesecond
largestearthquakerecordedinthelast100years.Thelargestwasa9.5magnitudeearthquakeinChilein1960.Thegreat1906San
Franciscoearthquakehadamagnitudeof7.9.
DistantEvents
Themapaboveshowsthelocationof1372events
occurringover10degreesor1100kmfromstation
TA_D63A.Thesizeoftheorangesquaresis
proportionaltothemagnitudeoftheevent.Station
TA_D63Aisshownasaredtriangle.
Thischartshowsthenumberofdistantearthquakesthatoccurredata
givendistancefromstationTA_D63A.Thedistanceisgivenin10degree
incrementswhichcorrespondstoadistanceof1100km.
SeismogramofaDistantEvent
ThelocationofstationTA_D63Ais
shownbytheredtriangle;thewhitestar
depictsthelocationonthesurface
directlyabovetheearthquake.
ThreecomponentsrecordedfromadistanteventdetectedbystationTA_D63Aon
11/01/2013(3:24:09.540UTC).Themagnitudeofthiseventwas,andwas
approximately13218kmfromtherecordingstation.Thefirstseismicwavesarrivedat
thisstation1.06secondsaftertheeventoccurred.
6
Whatisinsidethevault?
Wemonitorseveraldiagnosticparametersrecordedcontinuously.Theseallowustomonitorthat
thestationisworkingproperly.TheredlinerepresentsthetemperatureindegreesCelsius(C)
recordedinsidetheseismicvaultduringthelifetimeofTA_D63A.Thepoweravailable(volts)and
supplied(currentintenthsofAmperes)tothestationequipmentareshownbythegreenandblue
linesrespectively.
Cross-sectionofatypical
seismicstation
LinkstoAdditionalInformation
http://earthscope.org
Earthscope:ANationalEarthScienceProgramtoExplorethe
StructureandEvolutionoftheNorthAmericanContinentand
UnderstandProcessesControllingEarthquakesand
Volcanoes.
http://www.usarray.org/
DescriptionoftheUSArraycomponentofEarthScope,which
includestheTransportableArray(TA),ofwhichyourstation
wasapart.
http://anf.ucsd.edu
TheUSArrayArrayNetworkFacility-inchargeofthe
operationalaspectsoftheTA,andwherethedatafromyour
stationweretransmitted.
http://www.iris.edu/seismon
SeismicMonitor:Mapoflatestearthquakes,withlocations
providedcourtesyoftheUnitedStatesGeologicalSurvey.
http://www.iris.edu/hq/programs/education_and_outreach
IRISEducationandPublicOutreachwebsitewithlinksto
educationalmaterialsforK-12schoolsaswellasforthepublic.
http://earthquake.usgs.gov/
TheUSGSEarthquakeHazardsProgram,withinformationand
locationsforearthquakeswithinminutesoftheiroccurrence.
http://www.nsf.gov/
TheNationalScienceFoundation,thefederalagencywhichis
theprimarysponsorofEarthScopeandUSArray.
http://www.iris.edu/hq/
TheIncorporatedResearchInstitutionsforSeismology(IRIS)
mainwebsite,agatewaytomanylinksrelatedtoseismology
andearthquakes.
EarthScopeisfundedbytheNationalScienceFoundation.EarthScopeisbeingconstructed,operated,
andmaintainedasacollaborativeeffortwithUNAVCOInc.,theIncorporatedResearchInstitutionsfor
Seismology,andStanfordUniversity,withcontributionsfromtheUSGeologicalSurvey,NASA,and
severalothernationalandinternationalorganizations.