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Analog seismograms

Analog seismograms of the Catalan Seismic Network

Except for EBR and FBR stations, property of Observatori de l'Ebre and Observatori Fabra, respectively, the Catalan Seismic Network started in 1985. Until 2008 the seismic stations were equipped with vertical short period sensors with analog recording. Ground motion was telemetered or cabled from field sensor to continuous recording drums.

Sketch of a seismic station with analog recording

Specific information about the network deployment can be found on the published Seismic Bulletins. Since 1999 new Broad Band stations with satellite transmission were deployed; but some stations continued with analog recording for some years.

Seismograms were recorded on thermic paper and records were replaced daily between 7:00 and 10:00 in the morning. Exceptionally some seismograms contain 48 hours of seismic recording.

Due to the fragility of the thermic paper and with the objective to preserve them for the future, all seismograms have been scanned at 1200dpi density in grey scale.

Analog seismic recorder drum

The whole series of records for the 10 stations showed on the map are available as raster images.

Map showing the analog recording stations of the Catalan Seismic Network

A list of existing records for each station is available and can be search from the next table.

Station

Code

Period

Les Avellanes

AVN

June 1987 - October 2000

Cerdanya

CAD

November 1987 - May 2001

Ebre

EBR

July 1905 -

Roquetes

EROQ

January 1988 - July 1993

Fabra

FBR

1906 - December 1996

Fontmartina

FONT

May 1989 - May 2004

Montserrat

MRB

July 1987 - May 1993

Olot

OLT

December 1985 - December 2008

Sort

SOR

July 1993 - June 2002

Vielha

VIH

November 1985 - May 2005

Search

Search available analog seismic records

Seismogram examples

4 multimedia

Seismic record of Sort (SOR) analog seismic station for 15-16 May 1995. The record of earthquakes ocurred off the Tarragona coast are observed.