Seismicity in Pennsylvania and the Pennsylvania State...
Transcript of Seismicity in Pennsylvania and the Pennsylvania State...
SeismicityinPennsylvaniaandthePennsylvaniaStateSeismicNetwork
(PASEIS)
AndyNybladeandKyleHommanDepartmentofGeosciences,PennStateUniversity
April4,2017PresentaIonmadetotheGeophysicalSocietyofPiJsburgh
IntroducIon
• ReviewofseismicityinPA• ReviewofseismicnetworksinPA• SeismicityinPennsylvania2013-2015• BuildingthePennsylvaniaStateSeismicNetwork(PASEIS)
• EventdetecIonandlocaIon• PASEISwebsite
Earthquake locations by the Lamont Cooperative Seismographic Network, US Geological Survey and the Geological Survey of Canada.
June 2010, Won-Young Kim, Lamont-Doherty Earth Observatory of Columbia University, <www.ldeo.columbia.edu/LCSN>.
Earthquakes in NE United States and Canada 1990 - 2010
84˚W 80˚W 76˚W 72˚W 68˚W 64˚W
36˚N
38˚N
40˚N
42˚N
44˚N
46˚N
48˚N
50˚NEarthquakesSeismographic stations
5 4 3 2 1
Earthquakemagnitudes
0 200 400 600 km
www.earthinsItute.columbia.edu/news/2004/story04-30-04b.html)
ArmbrusterandSeeber(1987)
PermanentseismicstaIonsinPAthrough2015• USGSNaIonalNetwork(2staIons)• LamontDohertyEarthObservatoryCooperaIveSeismic
Network(LCSN)(supportedasaregionalnetworkbytheUSGS)(6staIons)
• IniIal10PASEISstaIonsUSGSandLCSNStaIons
HistoryofbuildingaPAstateseismicnetwork• 2006-2009Establishmentofthefirst6permanentPASEISstaIons–
DCNR(dataarchivedanddistributedusingthePENetworkcode)• 2009CarbonsequestraIontechnicalassessment-DCNR
– 25portableseismicsta0ons• 2010Purchaseof4USArraystaIonsfromIRIS–DCNR• 2013EarthquakemonitoringduringUSArray-DCNR
– SupportfortemporarynetworktodensifytheUSArraynetwork,developseismicitycatalog
• 2015Expandthe10-staIonpermanentnetworkto30staIonsandprovideseismiceventinformaIon–DCNRandDEP
USArray
StaIons2/2013to6/2015
• 1013-componenthighquality(broadband)staIons
• RecordingconInuously
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TA PE GSN PASEIS LD
K52AK54A
K55AK56A K57A K58A K59A
L54A L55AL57A
L56AL58A
L59A
L60A
BINY
ALLY
M52AM53A M54A M55A
M56AM57A
M58A
M59AM60A
N52A N53AN54A
N55AN56A
N57AN58A
N59AN60A N61A
O56AO53A
O54AO55A O57A
O58A
O59A O60A
P53A P54AP55A P58A
P56A
P57AP59A
P60A P61A
Q53AQ54A Q55A Q56A Q57A
Q58A Q59AQ60A
Q61A
PAMG
PAHCPACH
PACF
PALR
UPAO
PSDB
MCWVPARS
PARC
PSUFPASH
PAYC
PACW
PAHR
PARB
PSAL
PAPG
WRPS
SSPAPAGS PATY
PAMC
PANPPAPL
PALW
PSWBKSPA
PALB PASW
FMPA
LUPA
TUPAMVL
O61APSUB
ERPAL53A
PAseismicity2/2013to06/2015(fromKyleHomman’sMSthesis,PSU)
• AveragenumberofstaIonsusedforeachevent:10
• MinimumnumberofstaIonsusedwas4• 1761eventswith1544locatedinPennsylvania
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2013-2015
Historical
MagnitudesandDepths• Local
magnitudesrangefrom1.0to2.9
• Depthsmostly
<1km
Catalogiscompletetomagnitude1.8
MineorQuarryBlasts
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Mine Blasts
Non-miningevents
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AretherespaIalandtemporalcorrelaIonswithwellacIvity?
Non-miningeventsProducIonwells(2013/2015)InjecIonwells
-Nocorrela<onhasbeenfoundwitheitherinjec<onwellsorfrackedwellsforthe2013-2015<meperiod
Summaryoffindings:1530miningrelatedevents14Non-miningevents–theyareallprobablytectonicearthquakes
Historical 2/2013-6/2015
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IUPA
PABE
PABK
PACF
PACH
PACW
PAGS
PAHR
PAKC
PAKS PALB
PALRPAMP
PAMR
PAOC
PAPL
PASH
PSALPSBK
PSBV
PSDB
PSMA
PSSK
PSUBPSUF
PSWB
UPAO
WRPS
PSSH
PARS
PASEIS Station Map Sept. 2016
Equipment
• GuralpCMG3Tseismometer• NanometricsCompactTrilliumseismometer
RefTekRT130Datalogger
GPSClock
Broadband3-componentseismometers
Basementdeployments–mostlyatuniversitylocaIons
Outsidevaultdeployments–mostlyatstateparklocaIons
TechnicalspecificaIons;Networkcode=PE
hCp://ds.iris.edu/mda/PE
Overviewofnetwork
ListofstaIonnames,locaIons,andstartImes
Informa<ononhowtorequestthedata
Viewsomeofthedata
OpenbroadbandseismicstaIonsinPAwithnearreal-Imetelemetry• 30staIonsinthePASEISnetwork• 6staIonsoperatedbyLCSN(LD)• 2staIonsoperatedbytheUSGS(US)• 4staIonsintheCEUSNnetworkoperatedbyIRIS/USGS
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PABE
PABK
PACH
PACW
PAGS
PAHR
PAKC
PAKS PALB
PALRPAMP
PAMR
PAOC
PAPL
PSALPSBK
PSBV
PSDB
PSMA
PSSK
PSUBPSUF
WRPS N58A
M55AM57A
FMPA
LUPA
ALLY
TUPA
KSPA
O54A
PARS
UPAO
PASH
SSPA
PACFPSWB
MVL
ERPA
PSSH
PASEIS CEUSN LD US
IUPA
Sta<onsusedtodetectandlocateseismiceventsbyPASEIS(71total)
EarthwormProcess
• AutomaIcdetecIonandlocaIonofseismicevents– ArrivalImepicks(PandSwaves)• STA/LTAalgorithm• Frequencybandalgorithm
– LocaIon• HYPOINVERSEcodewithvelocitymodelforPA
• Alerts– RecordseventinformaIonandsendsemailalerts
AnalysisofAutoma<cLoca<ons
• DeterminewhetheraneventisrealorafalsedetecIon– UseinformaIononemailalert
• WaveformcharacterisIcs• LocaIonofstaIons• LocaIonofevent(neartoknownmine?)
• IfthereisanyindicaIonthattheeventmightnotbeafalsedetecIon,thentheeventismanuallyrelocated
ManualEventLoca<ons
• PulldatafromEarthwormserver• RefinearrivalImepicksbyhandusingSEISAN• RelocateeventusingHYPOINVERSEandsamevelocitymodelasusedforautomaIcsoluIon
• AddeventinformaIontodatabaseandpostonthewebsite
ExampleP-andS-wavearrivalImepicksfromSEISAN
Pwave
Swave
VerIcalComponent
North-SouthComponent
East-WestComponent
EmailAlertreceivedforMagnitude2.2earthquakenearTitusvillePAonApril18,2016
-0.4-0.20.00.2 Pennsylvania
PACH HHZAPR 18 (109), 201610:34:41.000
-0.4-0.20.00.2 Pennsylvania
PACH HHEAPR 18 (109), 201610:34:41.000
-0.4-0.20.00.2 Pennsylvania
PACH HHNAPR 18 (109), 201610:34:41.000
0 5 10 15 20 25Time (s)
Dis
plac
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t (m
icro
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PACH
Whatdothedatalooklike?(ChapmanStatePark)
Magnitude2.2Time:2016/04/1806:34:40localDepth3.3miles(5.2km)NearTitusville,PA
Pwave
Swave
VerIcal
East-west
North-south
1micron=0.001millimeterFigurecourtesyofC.Ammon
ExampleofanEmailalertforaTeleseismicearthquake(adistant,M>5earthquake)
ExampleofanEmailalertforafalsedetecIononculturalnoise(mostalertslooklikethis!)
ExampleEmailalertforaminingblast.NotecharacterisIclongperiodsurfacewave.
EmailalertforoneoftheLawrenceCountyeventsonApril25,2016.
(hJp://paseis.geosc.psu.edu)
AcknowledgmentsSupportforPASEIScomesfromDCNR(BureauofTopographicandGeologicSurvey)andDEP
IRISprovidesdatamanagement(dataarchivinganddistribuIon)
2/13/11 4:16 PMNSF_Logo.jpg 692×692 pixels
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