Observatories and Research Facilities for EUropean Seismology
Volume 4, no 1 May 2002 Orfeus Newsletter


Internet site for european strong-motion data

N.N. Ambraseys1, J. Douglas1, B. Margaris2, R. Sigbjörnsson3, P. Smit4, P. Suhadolc5

1Department of Civil & Environmental Engineering, Imperial College of Science, Technology & Medicine, London, SW7 2BU, UK
2Institute of Engineering Seismology & Earthquake Engineering, Ministry of Environment and Public Works, Thessaloniki, Greece
3Earthquake Engineering Research Centre, University of Iceland, Reykjavik, Iceland
4National Emergency Operation Centre, P.O. Box 8044 Zürich, Switzerland
5Dipartimento di Scienze della Terra, Universita degli Studi di Trieste, Trieste, Italy

Following on from the successful European Commission funded CD ROM 'Dissemination of European Strong-Motion Data' project, a project to establish an Internetsite where European strong-motion data could be downloaded was undertaken. This project was again funded by the European Commission (contract EVR1-CT-1999-40008). As with the CD ROM project, the Internet Site for European Strong-Motion Data (ISESD) was a collaborative project between four European partners. These partners were: Imperial College of Science, Technology and Medicine, London, UK; University of Iceland, Reykjavik, Iceland; University of Trieste, Italy and Institute of Engineering Seismology and Earthquake Engineering, Thessaloniki, Greece. The University of Trieste employed Institute of Earthquake Engineering and Engineering Seismology, University Kiril and Metodij, Skopje, Macedonia as a subcontractor to provide and process strong-motion records from the former Yugoslavia. The project ran from April 2000 to March 2002.

The Internet Site for European Strong-Motion Data (ISESD) project established an Internet site for the free dissemination of European and Middle Eastern strong-motion data with associated seismological parameters in a uniform data format. This project has improved the accessibility of European strong-motion data, which in the past has often been difficult to obtain. It also seeks to increase cooperation between operators of strong-motion networks and the end users of the data by providing up-to-date details of network operators.

Four mirror Internet sites are established at the four partners' institutions. The URLs of these sites are:
http://www.isesd.cv.ic.ac.uk/
http://seismo.univ.trieste.it/
http://smbase.itsak.gr/
http://www.isesd.hi.is/

At present there are 1,968 records from 805 earthquakes recorded at 622 different stations available for download using an easy-to-use selection procedure. There are associated parameters of an additional 1,268 records on the Internet site which are not currently available for download due either to the poor quality of the records or because permission has not been given by their owners to disseminate the records. The basis of ISESD is the CD ROM 'Dissemination of European Strong-Motion Data' produced by N. Ambraseys, P. Smit, R. Berardi, D. Rinaldis, F. Cotton and C. Berge-Thierry (2000) and funded by the European Commission, Research-Directorate General, Environment and Climate Programme (contract ENV4-CT97-0397). However, we have updated many of the associated parameters of the records that were contained on this CD ROM and also have added more than 900 additional, mainly triaxial, strong-motion records. Figure 1 shows the geographical distribution of the strong-motion data currently catalogued on the site and Figure 2 shows the distribution of data in terms of magnitude, distance and site category.

click for large figure

Figure 1. Geographical distribution of the ISESD databank.

click for large figure
Figure 2. Distribution of the ISESD databank in terms of magnitude, distance and site category (blue cross is unknown, red diamond is rock, green upwards triangle is alluvium, green downwards triangle is stiff soil, green pentagram is soft soil and white circle is very soft soil).

This project is not possible without the unselfish support of the providers of the strong-motion data; we thank them very much for their help. Please see the acknowledgements page of the website for details. We are grateful for the support we received from a grant from the European Commission 5th Framework Programme (contract EVR1-CT-1999-40008). We also thank the European Commission 4th Framework Programme (contract ENV4-CT97-0397) and Engineering and Physical Sciences Research Council for financial assistance during the preliminary compilation of a data subset.

We hope that ISESD will prove useful to engineers and scientists alike. If you have any suggestions or comments please contact one of the partners. We are always grateful for new information or new strong-motion data; if you want to contribute to ISESD please do not hesitate to contact us. We hope to continue updating the data archived on the Internet site so that ISESD continues to be up-to-date.

If you use data from ISESD please cite: Ambraseys, N., P. Smit, R. Sigbjörnsson, P. Suhadolc, and B. Margaris (2002). Internet-Site for European Strong-Motion Data, EVR1-CT-1999-40008, European Commission, Directorate-General XII, Environmental and Climate Programme, Bruxelles, Belgium.

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