11:15 AM - 11:30 AM
[S05-2-04] PRESERVING ANALOGUE SEISMOGRAMS OF REGIONAL NETWORKS AND OTHER DOCUMENTS. EXPERIENCE AT THE INSTITUT CARTOGRAFIC I GEOLOGIC DE CATALUNYA (ICGC)
Catalonia, in the NE of the Iberian Peninsula, has a long tradition on seismic recording. First seismic station in this regions, EBR, still active, was installed in 1904. The second one, FBR, started in 1906 and it is also active. Both keep their seismograms and a large amount of complementary information. Since then several initiatives succeeded.
One of them is the Catalan seismic network. Started in 1985, it can be classified as regional network. As it was quite common at the time, short period vertical sensors were used. Most of the seismograms obtained up to year 2000 were recorded on thermal paper support. At ICGC we keep at present around 28000 record sheets from the period 1985-2000. Such kind of support is unstable and records become whitened after few years. Thus, even we are dealing with post WWSSN era records, actions to preserve them are needed urgently and the posed problems and needs are similar to those of the WWSSN and earlier records.
To save these records for the future, a campaign to scan them as images has been undertaken. These seismograms show some specific features when compared with WWSSN or older records (ex. The high frequency content of the signal obliges to use high density scanning -1200 dpi). As this successful experience can be useful to preserve records of other regional networks, we present here the adopted strategies for scanning, classification and diffusion and some preliminary results from their analysis.
These projects joint other initiatives developed at ICGC for preserving and diffusion of other materials as seismic bulletins, macroseismic records, etc. of the older stations EBR and FBR. Some examples will be also presented.
One of them is the Catalan seismic network. Started in 1985, it can be classified as regional network. As it was quite common at the time, short period vertical sensors were used. Most of the seismograms obtained up to year 2000 were recorded on thermal paper support. At ICGC we keep at present around 28000 record sheets from the period 1985-2000. Such kind of support is unstable and records become whitened after few years. Thus, even we are dealing with post WWSSN era records, actions to preserve them are needed urgently and the posed problems and needs are similar to those of the WWSSN and earlier records.
To save these records for the future, a campaign to scan them as images has been undertaken. These seismograms show some specific features when compared with WWSSN or older records (ex. The high frequency content of the signal obliges to use high density scanning -1200 dpi). As this successful experience can be useful to preserve records of other regional networks, we present here the adopted strategies for scanning, classification and diffusion and some preliminary results from their analysis.
These projects joint other initiatives developed at ICGC for preserving and diffusion of other materials as seismic bulletins, macroseismic records, etc. of the older stations EBR and FBR. Some examples will be also presented.