This map illustrates the Nov 2002 San Ramon swarm in the context of historical seismicity. Earthquakes from the USGS catalog 1970-2002 are plotted, with events of ML >= 4.0 plotted with large circles. Events associated with various sequences are plotted in color: 1970 Danville (blue), 1976 Danville (tourquoise), 1980 Livermore (yellow), and 1990 Alamo (green). Events from the 2002 swarm are plotted in red.