LCSN Station Operators Workshop 2005 The LCSN (Lamont-Doherty Cooperative Seismographic Network)...

LCSN Station Operators Workshop 2005

The LCSN (Lamont-Doherty Cooperative Seismographic Network) operates 40 seismographic stations in seven states: Connecticut, Delaware, Maryland, New Jersey, New York, Pennsylvania and Vermont. Partners of LCSN are (ordered by station code):

Adirondack Community College, SUNY (ACCN) Allegheny College (ALLY)William Annin Middle School, NJ (BRNJ)College of Agriculture and Technology, Cobleskill, SUNY (CONY) Central Park Conservancy (CPNY)Carthage Central High School, NY (CTNY)Queens College, CUNY (CUNY) Delaware Geological Survey (DGS subnet) Franklin and Marshall College (FMPA) Fordham University (FOR) Miner Agricultural Research Institute (FRNY, PNZ) ; Plattsburgh State, SUNY (FRNY) Geneseo College, SUNY (GENY) University of Vermont, Burlington (HBVT) Lehigh University (LUPA) Middlebury College (MDV, MIV) POLARIS Consortium, Canada (MEDO) Millersville University, PA (MVL) College of Environmental Science and Forestry, Syracuse, SUNY (NCB) Potsdam University, SUNY (PTN)Maryland Geological Survey (SDMD) University of Connecticut (UCCT) Westchester Community College, SUNY (WCC) LDEO (PAL, LONY, LSCT)

LCSN Workshop 2005: Objective

Main objectives (narrow):

1) seismic monitoring for improved delineation and evaluation of hazards associated with earthquakes in the Northeastern United States,

2) promote effective dissemination of earthquake data and information to the public and emergency management agencies, and

3) improve real-time data exchange between regional networks and the USNSN for development of an Advanced National Seismic System (ANSS) and expanded earthquake reporting capabilities.

“Seismic monitoring is the foundation upon which all earthquake mitigation practices are built” (USGS Circular 1188, Advanced National Seismic System).

broader goals:4) Provide high-quality data for seismic research,5) Education and outreach.

LCSN Workshop 2005 : Seismicity & Earthquake Hazard in Eastern North America

● LCSN provides data for evaluation of hazards associated with earthquakes, and helpsearthquake mitigation efforts.

● K-12 education, and public outreach,

● Basic scientific research.

LCSN Workshop 2005

● LCSN consists of over 20 broadband stations since 1999.

● Short-period stations with RF radio telemetry will be phased out in the next few years,

● Target is about 50 to 100 km inter-station spacing, slightly better than planned EarthScope deployment.

LCSN Workshop 2005 LCSN Workshop 2005

List of broadband stations (chronological order)−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−STATION LAT LONG ELEV OPERATION STATION COORPORATINGCODE (°N) (°W) (m) (year/mo/da) NAME INSTITUTION−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−PAL 41.0056 73.9079 66 1992/01/01- Palisades, NY, LDEO/LCSNNCB 43.9734 74.2228 575 1992/01/01- Newcomb, NY USNSN/LCSNLSCT 41.6784 73.2244 318 1992/10/27- Lakeside, CT LCSN/USNSNACCN 43.3843 73.6678 340 1999/11/09- Adirondack Comm. College, NY SUNYBRNJ 40.6828 74.5660 50 1999/11/21- Basking Ridge, NJ, William-Annin Middle SchoolLUPA 40.5985 75.3714 236 2001/01/01- Lehigh University, PAMVL 39.9992 76.3506 91 2001/02/15- Millersville Millersville University, PASDMD 39.4102 76.8403 - 2001/11/01- Soldier's Delight, MD MGS (Natural Environment Area)CONY 42.6658 74.4688 468 2001/07/13- Cobleskill, NY, SUNY CobleskillGENY 42.7670 77.8170 2001/10/27- Geneseo, NY, SUNY Geneso/LCSNCPNY 40.7912 73.9600 27 2002/02/21- Central Park, NYC, Central Park ConservanceyFOR 40.8631 73.8856 24 2002/04/18 Fordham University, the Bronx, NYCUNY 40.7335 73.8178 20 2002/05/23 City University of New York, Queens College, Queens, NYALLY 41.6492 80.1448 390 2002/05/30 Allegheny College Allegheny College, PAFRNY 44.8350 73.5883 223 2003/11/13 Flat Rock, Altona, NY LCSN/Miner Institute, NY UCCT 41.7943 72.2255 223 2005/01/13 UConn, CT University of ConnecticutFMPA 40.0478 76.3208 121 2005/02/22 Franklin & Marshall, PA Franklin & Marshall CollegeLONY 44.6197 74.5829 440 2005/10/01 Lake Ozonia, NY ANSS/LCSN/SUNY PotsdamPTN 44.5699 74.9823 197 2005/10/28 Potsdam, NY LCSN/SUNY PotsdamCTNY 43.9879 75.6453 187 2005/11/08 Carthage, NY LCSN/Carthage Central High School, NY−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−

LCSN Workshop 2005: LCSN real-time data acquisition & processing

LCSN acquires most of the real-time data though the Internet -- satellite telemetry (USNSN, CNSN), and FM radio telemetry (short-period stations) are used as primary media.

1) Master Earthworm,2) Antelope system: Automatic signal detection, phase association, event location. IRIS-DMC for archive and world-wide dissemination.3) Notification

LCSN Workshop 2005: Lamont-Doherty Seismogrpahic Network in early 1980s

It started in early 1970's, after the Plate Tectonics,

● short-period seismometer,● FM radio telemetry, ● 12-bit digitizing, ● data transfer using dedicated telephone lines from hubs to Lamont.

Lamont seismic network in mid 1980's.

LCSN Workshop 2005 : Network Performance, Station uptime

This plot shows status of real-time data acquisition.

It can be used to review problems at each stations and network as a whole.

Jan Nov

Real-time data continuity & gaps for Jan. - Nov.


Station & Network Performance

Station Start time End time DropoffUptime-------- -------------------------- -------------------------- ---------- ----------ACCN 05/01/01 00:00:00 05/11/15 23:59:59 93.81% 94.11%ALLY 05/01/01 00:00:00 05/11/15 02:41:00 96.82% 96.85%BRNJ 05/01/01 00:00:00 05/11/14 23:59:59 93.98% 93.98%CONY 05/01/01 00:00:00 05/01/04 21:10:52 99.95% 01.22%CPNY 05/01/01 00:00:00 05/11/14 23:59:59 93.46% 93.46%FMPA 05/02/22 23:52:50 05/11/15 12:52:01 78.27% 65.36%FOR 05/01/01 00:00:00 05/11/15 23:59:59 90.19% 90.47%FRNY 05/05/25 00:25:44 05/11/14 23:59:17 82.82% 45.31%GENY 05/01/01 00:00:00 05/11/15 23:59:59 90.05% 90.34%LOZ 05/01/01 17:43:46 05/11/14 18:11:10 35.61% 35.50%LSCT 05/01/01 00:00:00 05/11/09 17:41:29 40.39% 39.72%LUPA 05/01/01 07:19:28 05/01/09 23:49:35 53.52% 01.46%MVL 05/01/20 15:04:55 05/11/15 23:59:59 71.86% 67.65%NCB 05/01/01 00:00:00 05/11/14 23:59:59 86.41% 86.41%PAL 05/01/01 00:00:00 05/11/14 23:59:59 98.39% 98.39%PTN 05/11/07 20:04:48 05/11/15 08:46:11 99.68% 02.36%SDMD 05/01/01 00:00:00 05/11/14 23:59:59 97.19% 97.19%UCCT 05/03/04 01:47:53 05/11/15 07:16:39 90.06% 72.57%


Real-time data

LCSN target is 95% uptime and data dropoff.

CONY, LUPA was down due to instrument failure, PTN is only for 20 days etc.

AC

CN

ALLY

BR

NJ

CO

NY

CP

NY

FM

PA

FO

RF

RN

YG

EN

YLO

ZLS

CT

LUP

AM

VL

NC

BP

AL

PT

NS

DM

DU

CC

T

0

0.2

0.4

0.6

0.8

1

1.2

Signal Dropoff -- Broadband 2005

DropoffUptime

LCSN Workshop 2005: Station Performance

Power spectral density (PSD) of digital seismic data for noise character and instrument performance.

Quack (Quality Analysis Control Kit): a web footed interface developed by USGS/IRIS.

For all data submitted to IRIS-DMC with proper instrument response.

Plot quality control parameters.

-145 @ 1 Hz

http://www.iris.washington.edu/servlet/quackquery/

PAL (Palisades, NY) LCSN reference station with STS-2 seismometer, T0=120 s

low noise model

-135 db @ 1 Hz


-145 @ 1 Hz

http://www.iris.washington.edu/QUACK

PAL (Palisades, NY) two horizontal components, NS & EW, PSD (Power spectral density (PSD) with probability density function (PDF).

low noise model


ACCN ( Adirondack Community College, Glens Falls, NY), vertical-component PSD, sensor CMG-3T with T0=100 sec

-145 db


PDF/PSD for NS and EW components at ACCN

Notice higher noise level at long period ~100s (~-140 db), compared with vertical component (-180 db). This is a typical case.


PSD for Vertical-component at BRNJ (Basking Ridge, NJ) sensor CMG-40T with T0=30 sec

PSD is about -127 db at 1 Hz, and -128 db at 100s. Notice the sensor's natural period 20 s.

Real-time Data Exchange & Earthquake detection, location & alert LCSN, GSC, POLARISLCSN Workshop 2005: Station Performance

PSD for NS and EW components at BRNJ


PSD for Vertical-component at GENY (Geneseo, NY) sensor CMG-3ESP with T0=30 sec

PSD is about -131 db at 1 Hz, and -120 db at 100s. Notice the sensor's natural period 30 s.


PDF/PSD for NS and EW components at GENY

Notice noise level at long period ~100s (~-135 db), compared with vertical component (-120 db). This is NOT a typical case.


PSD for vertical-component at LOZ, sensor CMG-3ESPD



PSD for vertical-component at LUPA (Lehigh Univ., Penn)CMG-3T, T0=100s.



PSD for vertical-component at MVL (Millersville, PA), CMG-3ESP, T0=30s

Notice noise level at 1 Hz is -140 db and long period ~100s (~-170 db).


PSD for horizontal components at MVL, CMG-3ESP, T0=30s

Notice noise level at long period ~100s (~-140 db) with low probability density, compared with vertical component (-170 db).

Summary: PSD for vertical component at most of the stations range from -145 db at ACCN to -127 db at BRNJ.

LCSN Station Operators Workshop 2005 The LCSN (Lamont-Doherty Cooperative Seismographic Network)...

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