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The GEOFON Program |
GEOFON Status Report for the FDSN Meeting Hawaii June 2002
Winfried Hanka, GeoForschungsZentrum, D-14473 Potsdam, Germany, hanka@gfz-potsdam.de
Network
The permanent GEOFON network consists presently of 48 stations (table 1). New stations were installed in 2001 in Al Marj (Libya) and Helgoland Island (Germany). The San Fernando (Spain) station was moved to another location due to vandalism. The station Mt. Meron (Israel) had to be closed and another North Israelian station (Kfar Sold) was chosen for the GEOFON network instead. In Spain, another station (Sierra Elvira, Granada) became part of GEOFON. At three stations, Piszkes (Hungary), Helgoland (Germany) and Summit Camp (Greenland), the new Earth Data digitizer was installed instead of the former Quanterra dataloggers (or Reftek in case of Summit) with great success. But the main activity in terms of network upgrade was the installation of in total 45 SeisComP communication systems in 35 stations and 10 data collection centers. Even from the Greenland ice cap real-time data are transmitted now in real-time to the GEOFON DC. A small, low power, PC/104 based SeisComP box with Linux OS was specially developed at GFZ and is now commercially manufactured by a German company and sold also to other customers worldwide.
Data Center
The complete data from 34 permanent stations are meanwhile transmitted to the GEOFON DC through SeedLink connections in (near) real-time (Fig. 3). The achieved time delays range between a few seconds (Internet or dedicated lines) over a few minutes (up to 30) for fast dial-up and up to 24 hours (resource saving overnight transfer). The incoming SeedLink data are immediately forwarded to several other data centers like the IRIS DMC, the ODC and several more. An automated NRT data processing and archival system checks the data for quality problems, runs an event picker and copies the data into the online NRT data base. A new software package (AutoLoc) takes the picks, associates arrivals, locates events and distributes the results for the most important events as alert emails and web page entries in less than 2 minutes after the first arrivals.
In replacement of the old SPYDER system, a new event window data base named QuickFARM was created. It is triggered by NEIC alerts and supplemented by Harvard CMT solutions. The windows are cut from the NRT data base and the window criteria are those of the former FARM system. Presently the QuickFARM MiniSEED event files are only available by ftp links through the GEOFON web site.
A twin Linux PC system with a total capacity of 2 TB disk for holding the entire data archive of the GEOFON DC online was installed in the beginning of 2002. The tape robot system is still used as backup medium. New archiving software was developed for automatic processing and archiving of the incoming online (NRT) and offline data (DCP) into the new data base architecture (Fig. 4). The complete GEOFON data archive is being reprocessed and the most important part of the archive (e.g. the full permanent GEOFON network data) is available now online. The rest will be as well soon. Data requests can be fulfilled much quicker now. The required operator time could substantially be reduced another time with the new processing and
archival software and the increasing amount of SeedLink data.
The IRIS DMC email based request processing system NetDC was successfully implemented the GEOFON DC. The present usage is still very low compared to the more common breq_fast.
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Fig. 1: GEOFON stations in Europe and the Mediterranean and data communication.scheme. |
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Fig. 2: GEOFON stations worldwide and data communication scheme. |
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Fig. 3: SeedLink data flow within the GEOFON network |
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Fig. 4: Data processing scheme of the GEOFON
Data Center |
| GeoForschungsNetz |
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The GEOFON Program |
GEOFON Station Summary Permanent Network (Status June 2002)
Code Coordinates Inst.Date Cooper. with Communication
Existing Permanent Stations
Port Moresby, PNG PMG 9.409S 147.154E Sep 93 IRIS/PACIFIC21 phone
Moravsky Beroun, CR MORC 49.776N 17.547E Nov 93 Internet/SLK
Dublin, Ireland DSB 53.245N 6.376W Dec 93 phone/SLK
Walferdange, Luxembourg WLF 49.665N 6.152E Mar 94 Internet/SLK
Bar Giora, Israel BGIO 31.722N 35.088E May 94 GII +++ May 96
Muntele Rosu, Romania MLR 45.492N 25.946E Oct 94 no
Ny Alesund, Spitsbergen KBS 78.915N 11.938E Nov 94 IRIS/AWI Internet/SLK
Kilimambogo, Kenya(rep.NAI)KMBO 1.274S 36.804E Jan 95 IRIS Internet/SLK
Michnevo, Russia MHV 54.958N 37.767E May 95 no
RŸgen, Germany (rep. LID) RGN 54.546N 13.364E May 95 GRSN ISDN/SLK
Suwalki, Poland SUW 54.013N 23.181E Nov 95 phone/SLK
RŸdersdorf, Germany (temp) RUE 52.480N 13.780E Nov 95 +++ Jan 00
Soend. Stroemfjord, Greenl.SFJ 66.997N 50.615W May 96 IRIS ISDN/SLK
Piszkes, Hungary PSZ 47.919N 19.894E Jun 96 IG Budapest Internet/SLK
San Fernando, Spain SFUC 36.637N 6.175W Jun 96 UCM/ROA +++ Oct 01
Tartu, Estonia TRTE 58.379N 24.721E Jun 96 Internet/SLK
Eilath, Israel EIL 29.670N 34.951E Jul 96 GII Internet/SLK
Wanagama, Indonesia UGM 7.913S 110.523E Aug 96 Inmarsat
Isparta, Turkey ISP 37.843N 30.509E Oct 96 MEDNET Internet/SLK
Limon Verde, Chile LVC 22.618S 68.911W Nov 96 IRIS Internet/LISS
Sanae, Antarctica SNAA 71.671S 2.838W Mar 97 AWI Internet/SLK
Manteigas, Portugal MTE 40.403N 7.537W Oct 97 ISDN/SLK
Cartagena, Spain CART 37.587N 1.001W Dec 97 UCM/ROA phone/SLK
St. Petersburg, Russia PUL 59.767N 30.316E May 98 Internet/SLK*
Danmarkshavn, Greenl. DAG 76.772N 18.654W Aug 98 AWI Inmarsat
IbbenbŸren, Germany IBBN 52.307N 7.757E Sep 98 U. Bochum ISDN/SLK
Mathiatis, Cyprus CSS 34.962N 33.331E Dec 98 GII phone/SLK
Boaco, Nicaragua BOA 12.48 N 85.72 W Jan 99 no
Rio Branco, Brasil RIOB 10.150S 67.747W Jan 99 Inmarsat
Mahon, Menorca, Spain MAHO 39.896N 4.267E Jun 99 UCM/ROA phone/SLK
Kalwaria Paclawska, Poland KWP 49.631N 22.708E Jun 99 phone/SLK
Maui, Hawaii, USA MAUI 20.768N 156.245W Jun 99 phone/SLK
Melilla, Spain MELI 35.290N 2.938W Dec 99 ETH/UCM/ROA phone/SLk
RŸdersdorf, Germany RUE 52.480N 13.780E Jan 00 GRSN ISDN/SLK
Malatya, Turkey MALT 38.313N 38.427E May 00 MedNed Internet/SLK
Gharyan, Libya GHAR 31.122N 13.089E Dec 00 ETH no
San Fernando, Spain SFS 36.466N 6.206W Oct 01 UCM/ROA Internet/SLK
Al Marj, Libya MARJ 32.553N 20.878E Dec 01 ETH no
Helgoland, Germany HLG 54.185N 7.884E Dec 01 U. Kiel ISDN/SLK
Summit Camp, Greenland SUMG 72.576N 38.454W Jun 02 Internet/SLk
Greek Sub Network (longterm)
Skordalos, Crete SKD or SKOR 35.412N 23.928E Aug 96 GSM
Kristallenia, Crete KRIS 35.178N 25.503E Aug 96 ISDN/SLK
Santorini, Greece SANT 36.371N 25.459E Aug 96 phone/SLK
Gavdos Island, Greece GVD 34.839N 24.087E Nov 99 ISDN/SLK
Moni Apezanon, Crete APEZ 34.977N 24.886E Apr 00 GSM
Fodele, Crete FODE 35.380N 24.958E Apr 00 GSM
Apirathos, Naxos, Greece APE 37.07 N 25.53 E Aug 00 GSM
Loosely Associated Stations (Data Distribution only)
Stuttgart, Germany STU 48.770N 9.193E Apr 94 IG Stuttgart Internet/SLK
Jerusalem, Israel JER 31.772N 35.197E May 96 GII Internet/SLK
Mount Meron, Israel MRNI 33.011N 35.400E Mar 98 GII +++ Jan 02
Sierra Elvira, Spain SELV 37.238N 3.728W Nov 01 IAG Granada phone/SLK
Kfar Sold, Israel KSDI 35.659N 33.192E Feb 02 GII Internet/SLK
SLK SeedLink (near) real-time data transfer
* Access denied
by Russian authorities
+++
Station closed