GEOFON Data Center

The GEOFON Data Center consists of four components:

GEOFON SPYDER (not maintained any more!)

The GEOFON SPYDER node presently regularly retrieves the data from about 40 stations e.g. nearly all permanent GEOFON stations and a set of other stations in Central Europe for all global events larger mb 5.5. This system is a common effort with IRIS DMC, ORFEUS DC and several other SPYDER nodes worldwide triggered by NEIC alerts. From GFZ, the GEOFON SPYDER data are distributed to ORFEUS Data Center and IRIS DMC by Internet and their data are copied to Potsdam the same way. Therefore several hours after origin time the event data for up to over 100 stations become available at the GEOFON DC for all major global events. From 1995 to 1999, a regional EuroSPYDER system for smaller events (5.0 < mb < 5.5) in Europe and the Mediterranean was operated, triggered at first internally and since summer 1997 also by the EMSC alerts. Presently it is not active anymore due to insufficient EMSC triggers. The SPYDER system provides data for the regional source parameter determination carried out at GFZ as a key node in the EMSC framework.  Access to SPYDER (and EuroSPYDER) is in the moment provided by a simple web interface only. More sophisticated web interfaces and improved AutoDRM access are under construction.

QuickFARM

The SPYDER data base is not maintained anymore since end of 2001. The new QuickFARM system provides enlarged event waveform windows (according to the IRIS FARM windowing rules) directly from the incoming SeedLink (NRT) data streams. The access is presently only by ftp. A user interface is under development.

GEOFON Online Data Base

An increasing number of GEOFON stations are equipped with SeisComP communication processors. These stations provide real-time or near-real-time data through Internet or dial-up lines using the SeedLink protocol (SeedLink data flow). For all non NRT stations, the data arrive in the data center with large delays on tape or CDs. Also these data are kept online after processing for a certain time period in the so-called data collection pool DCP and form together with the NRT pool the online data base OnDB. Data from this pools are very quickly accessable for user requests. Access tools for OnDB (as for the Archive) are either simple web forms or the email based breq_fast, NetDC and AutoDRM protocols.
  • "Live" seismograms from GEOFON SeedLink stations

    • GEOFON Data Archive

    The GEOFON Data Archive holds all data from the permanent GEOFON network (GE) as well as from some stations of the IRIS/USGS network (IU) and some older data of the German Regional Network (GR). The data base of the temporary GEOFON network (TE) combines data from different smaller BB experiments under the GEOFON project. Data older than 2 years are freely available. Data from some larger BB experiments are available for working group members only: DE - DESERT (Dead Sea Area), GD - GEDEPTH-II (Tibet), GL - GLATIS (Greenland), HW - Hawaii Plume, PO - Popocatepetl (Mexico), SA - South Andes, SV - SVEKALAPKO (Finland), TA (TransAlp), TD - TEDESE (Spain). Rules for open access to these data sets on request. The data are physically stored in a large tape robot system, located in the GFZ Central Computer Department. The data retrieval is automatic, but queued and may take some time. Both web forms and email based (breq_fast, NetDC) tools allow user access from the outside world. Also AutoDRM is supported, but presently only for the NRT data base. Update: the complete GE data archive and most of the other network/experiment data sets are now available online on a large (> 2 TB) disk array!

    Networked Data Centers

    The Networked Data Centers project is a joint effort of GEOFON with IRIS DMC, ORFEUS DC, GEOSCOPE and UC Berkeley. Users can request any data or station information from all these data centers by a single request to one of them, regardless where the data are actually located.  See also the NetDC manual.

    Other services of the GEOFON Data Center

  • GEOFON Station response files

    • Summary of Data Access Methods
    WWW:      http://www.gfz-potsdam.de/geofon/www_req/req_wel.html (access to SPYDER, OnDB and Archive)
    Email:       breq_fast (breq_fast@gfz-potsdam.de, access to OnDB and Archive)
                   netdc (netdc@gfz-potsdam.de, access to OnDB and Archive) PRESENTLY DISABLED!!
                   AutoDRM (autodrm@gfz-potsdam.de, presently only access to NRT) PRESENTLY DISABLED!!
    FTP:         ftp://ftp.gfz-potsdam.de/pub/home/st/GEOFON (access to customized data volumes)

    [GEOFON homepage] [GFZ homepage] [AB 2 homepage] [Sect. 2.4 homepage]