This map illustrates the Feb 2003 Dublin and Nov 2002 San Ramon swarms in the context of historical seismicity. Earthquakes from the USGS catalog 1970-2003 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 (grey), and 1990 Alamo (green). Events from the 2002 swarm are plotted in yellow and the events from 2003 are plotted in red.