Several sites have several different time windows for their maps (e.g., all historic events) that are not listed; I've tried to limit things to the more recent maps. If you really like a map but want more time, head to the site listed with it and see if there are other time windows (e.g., year-to-date at St. Louis U., past week at USGS Menlo Park).
While the sources for seismic information are generally few (e.g., U.S. Geological Survey's QED locations, Council of National Seismic System's joint and individual network members catalogs), the diversity of effort in making maps from these catalogs provides for entertaining viewing. Some strange artifacts (giant earthquakes in places which didn't have them) can be ferreted out by comparing maps and catalogs; these are produced by occasional system glitches. Maps are both static (generally those marked inline or external) and dynamic (built around specific events or user-input parameters). Generally I have tried to place more primary sources near the top of each regions listing.
Any comments, problems or suggestions, please e-mail firstname.lastname@example.org
C. H. Jones | CIRES | Dept. of Geological Sciences | Univ. of Colorado at Boulder