Inventory of earthquakes 1910 - 1982 and map of the magnitude threshold values 1928 - 1982

The earthquake activity in Switzerland was investigated recently in great detail with special emphasis on the area bordering Germany between Basel and the Lake of Constance. The results are compiled in a chronological earthquake catalogue for the years 1021 to 1982. For the time period 1910 - 1964 the existing catalogue was updated with mainly smaller events having seismic intensities less than IV. For the time since 1919, during which the availability of instrumental records in Switzerland increased, a majority of the earthquake parameters (such as location, focal depth and Richter-magnitude) could be determined more accurately with the aid of a new computer program. An important aspect of the work lies in the uniform treatment of all data with respect to new velocity-models for the earth's crust. Furthermore, the theoretical sensitivities of the differing seismic station networks which have been put into operation in Switzerland since 1919 were evaluated and mapped in terms of magnitude-thresholds. (author)