Introduction

Figure 1. Earthquakes from the ISC-GEM Catalogue in Central and South America.

The ISC-GEM Global Instrumental Earthquake Catalogue (1900-2009) is the result of a special effort to adapt and substantially extend and improve currently existing bulletin data to serve the requirements of the specific user group who assess and model seismic hazard and risk (Fig. 1).

Moreover, the Catalogue will also have a multidisciplinary use in a wide range of other areas such as studies of global seismicity, inner structure of the Earth, tectonics, nuclear monitoring research, rapid determination of hazard etc

This global catalogue was also designed to serve as a reference to be used for calibration purposes by those compiling regional seismicity catalogues that contain events of much smaller magnitudes. This way the catalogues prepared by other teams for different regions may contain comparable earthquake locations and magnitude parameters, especially in border regions

The work on the Catalogue was funded by the GEM Foundation as part of the five Global Hazard Components and is a result of the 27 month long project. This project was led by the ISC and performed by the Team of International Experts in accordance with the requirements of the Scientific Board of GEM and following recommendations of the team of IASPEI Observers.