Waveform Access

The GFZ Seismological Data Archive is the largest seismological data archive in Europe. It holds data from the permanent GEOFON VBB seismic network. For many GEOFON partner networks, GEOFON acts as backup archive and data distribution center. Additionally, data from many temporary station deployments are permanently archived at GEOFON, in particular passive seismological experiments of the GFZ Geophysical Instrument Pool Potsdam (GIPP) and the German Task Force Earthquake (data archival pending).

Real-time data streams from permanent networks are mostly acquired over the Internet and are immediately accessible as continuous data stream by SeedLink real-time feeds or on request from the archive. Most of the acquired European networks are members of the Virtual European Broadband Seismic Network (VEBSN). Although the archive consists mostly of data from broad band stations, a substantial amount of short period data is archived as well as some strong motion and OBS data.

The GEOFON Data Archive is linked by GFZ's ArcLink protocol to other partner data centers in Germany (German Integrated Data Archive - GIDA) and Europe (European Integrated Data Archive - EIDA). This integrated data archive infrastructure allows transparent access to the data of all participating archives through a single front-end data portal. All data are accessible in a unified way through ArcLink, SeedLink, web forms or by e-mail.

Archive Access Overview

MethodData:Open GFZ NetsRestricted GFZ DataOther EIDA Nets1
ArcLinkYesYesYes
WebDC3YesYesYes
fdsnws-stationYesYesNo
fdsnws-dataselectYesYes (trial version)No2
1 EIDA nets are third-party contributions to the EIDA collaboration, hosted at other nodes.
2 Except where the EIDA contributor lists GFZ as an alternative route.

Data availability

Archive access

Several methods are available to access waveform data from the GEOFON archive:

  • Using the FDSN web services, for data archived at GFZ.
  • Direct access through ArcLink, e.g. by using the arclink_fetch command line client.
  • Web-based requests through our web portal, especially for smaller requests.

Archive data shipments by HTTP (web portal or direct ArcLink requests) or FTP (BREQ_FAST requests) only!

Archive access to restricted data

Access is restricted for:

  • data from recent temporary deployments (limited-duration embargos)
  • some permanent third-party stations/networks for which GEOFON also acts as archive and distribution point

Access to these data may be granted only if the data user can produce written permission from the data producer to use the data, i.e. from the PI of the experiment or a representative of the institution that operates the network. Requests for data access must be sent to GEOFON including the permission statement. Requests using FDSN web services can now be made for restricted data; data requested by Arclink will be encrypted and needs to be decrypted before use.

Real-Time data feeds

GEOFON/GEVN data are available as real-time data feeds without special permission by the SeedLink protocol from the GEOFON SeedLink server at geofon.gfz-potsdam.de:18000. A visualization of the GEOFON real-time stations is provided in the form of "live" seismogram plots.

The telemetry status can be displayed by the following SeedLink monitors:

Data formats

  • SeedLink real-time data comes in 512 byte Mini-SEED format.
  • Archive data shipments in 512 or 4096 byte SEED format.
  • Instrument response information as Dataless SEED volumes or ArcLink XML response files are available through ArcLink and the WebDC3 data request interface (http://eida.gfz-potsdam.de/webdc3).
  • Restricted data is encrypted using OpenSSL.