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Continuous Data : Description

All GEOSCOPE stations record continuously the ground motion and most of them record also the temperature inside station and the atmospheric pressure.
Waveform data recorded continuously in the stations are transmitted to GEOSCOPE Data Center at IPGP, either in (near) real time or with a delay (some time after acquisition). Today, most of stations record the digital signals in miniSEED format. Signals recorded in other formats are converted to miniSEED format in the Data Center.
 
The metadata associated to the seismograms, as station information and channel response, are produced and validated by GEOSCOPE Network. All metadata is available in dataless SEED format, via a Web Interface.

 

Continuous data in real time

Raw data (not quality controlled) sent in (near) real time from stations to GEOSCOPE Data Center are inmediately available via the seedlink protocol (from SeisComP) developed by GEOFON/GFZ.
This robust protocol allows clients to ask data automatically in real time from GEOSCOPE Data Center in Paris, via the open seedlink server:

Hostname: rtserver.ipgp.fr
port: 18000

In order to minimize the number of connections to the server, it is strongly recommended to configure seedlink in multi-station mode when getting data.

Data stream is sent by seedlink in 512-byte miniSEED (data only) packets.
Seismological data from GEOSCOPE Network contribute to earthquake location and to Tsunami Warning systems worldwide.

 

Validated and archived data

Waveform data collected from stations is validated as soon as data arrives to the Data Center.
Validation process includes:
  • Detection of gaps/overlaps and filling up of gaps (often automatically) from data in station
  • Conversion of data to miniSEED format (if needed), re-encoding data in steim2 compression and 4096-byte blocks
  • Set up of SEED comments (station, channel) in case of station or acquisition system failure.

At the same time, metadata is produced and validated for new stations or station upgrades in order to be archived.

The graphs of data continuity give an overview of the validated and archived data status.

After quality control process, data (metadata and miniSEED files) is archived in the Information System holded by GEOSCOPE Data Center: the metadata is archived in a relational data base system and waveforms stored in a highly available storage system.

Validated data is immediately open to scientific community by different interfaces.