The Bulletin is the Centre's main publication. Published approximately two years after earthquakes occur, it contains all relevant information for a given month's earthquakes. For each event the origin estimates given by other agencies are listed, followed by the refined estimate calculated by the Centre. This gives origin time, latitude, longitude and depth with standard errors. The earthquake's felt effects and any unusual scientific features are also described. Magnitudes are calculated from body waves and surface waves when individual stations report measurements of amplitude and period, or their ratio. In recent years determinations of seismic moment, source mechanism and centroid moment tensor solutions are included for large earthquakes.
The Data is available in RES format which contains both epicentre and phase data or HDF format which contains epicentre data only. Yearly files are available from 1960 to 2006 for both, e.g. 1960.hdf.gz and 1960.res.gz. Please note that in total there are 1.2 Gb of data and a dvd can be ordered if you do not wish to download the entire dataset.
Language(s): English, French, Russian
Format: Digital (Free), Hard copy