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

Historical�80˚

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1.0 2.0 3.0 ML

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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1.0 2.0 3.0 ML

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

emen

t (m

icro

ns)

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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