SEISMOGRAPH NETWORKS OF THE INSTITUTE-OF-GEOLOGICAL-SCIENCES, UK

The IGS operates an eight-station, 100-km aperture network linked by radio to a central recorder in Edinburgh. It has been an observatory station for eight years supplying a rapid data input service to world agencies. The importance of infrequent local and regional seismic vibrations has been recognized by engineers as well as scientists involved in the study of intra-plate tectonics. In cooperation with other groups the IGS has embarked on a programme of more detailed monitoring within the United Kingdom and is anticipating closer links with other European stations in order to improve knowledge of the seismicity of the North Sea. The latter is particularly important because of the level of economic activity in the area, the sparse historical record, and the recently demonstrated potential for significant local earthquakes. Overseas, the IGS has instrumented the 20-channel array (SAAS) in Brazil, which is operated in collaboration with the University of Brasilia, and is providing technical support for the Turkish-U.K. network (MARNET) to monitor seismicity in the Marmara Sea. © 1979.