Back to Comparison of Observed and Synthetic Waveforms for Seismic Event Location and Phase Association

Maps indicating coverage of global seismic station network for small-magnitude events. White areas are geographic areas having three or more stations within 10 degrees (top) and 5 degrees (bottom); grey areas have one or two stations within 10 degrees (top) and 5 degrees (bottom). White and grey areas each comprise 26% and 31% of global surface on top map, and 6% and 21% in bottom map; thus small seismic events occurring over 74% (top) to 94% (bottom) of earth's surface are unlikely to be recorded by three stations. [reproduced from: Frohlich, C. and J. Pulliam. Single-station location of seismic events, Phys. Earth Planet. Int. (submitted, 1998).]