Observatories and Research Facilities for EUropean Seismology
Volume 1, no 1 January 1999 Orfeus Newsletter

ORFEUS Working Group 1: BB siting and station standards

Jan Zednik
Geophysical Institute, Academy of Sciences Czech Republic, Prague, Czech Republic

The ORFEUS working group 1 (WG1) was formed in 1996 in the effort to help the ORFEUS Data Center (ODC) to keep up with the growing load and the number of installed and proposed broadband (BB) stations in the European-Mediterranea area. WG1 maintains an inventory of permanent and semi-permanent digital BB seismograph stations in the region. Other issues discussed in the WG 1 are common standards for site, instrumentation and recording equipment; access to broad-band waveform data; defining an ORFEUS network; encourage "hidden" stations to open their data to the ORFEUS user community; propose new stations in areas with low BB coverage; support of local and national efforts to fill existing gaps with offical scientific arguments and practical hints.

WG1 is chaired by Jan Zednik. Members of the WG 1 represent at the moment 18 European countries and major networks in the region. IRIS nominated an observer in order to coordinate the activities. The WG1 members meet every year usually during ESC or IASPEI assemblies. The next WG1 meeting will be held at IUGG'99 in Birmingham. We encourage people involved in BB activities in the region to come to the meeting and give a short presentation about current and planned BB installations.

The main effort of the WG1 is concentrated in inventory for Europe and the Mediterranean and the EuroMed stationbook. The inventory table includes relevant information about permanent and semi-permanent stations, deployed seismometers and data acquisition systems. Seismometer and data acquisition manufactures with institutions operating the system are provided as well as detailed station information in the EuroMed stationbook.

The EuroMed stationbook for broadband seismograph stations in the European-Mediterranean area complements the FDSN station book, created by IRIS DMC. The EuroMed stationbook lists at present basic information about the station equipment, siting, administration and data access (see for example station HGN). We hope to add soon the data quality section. Information is provided by the individual stations or networks. A station book contains separated lists of FDSN and non-Federation BB stations in the European- Mediterranean area. A new station can be submitted through a station information entry form.

What are the station basic requirements? The Federation of Digital Seismograph Networks (FDSN) proposed in 1986 Minimum requirements and development goals for digital broad-band seismic systems. Presently, both within ORFEUS WG1, WG2 (Technical Support) and the FDSN related and relevant issues are being discussed.

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