The DMC database contains event information from several catalogs. Magnitudes and locations are often contributed to a catalog by several sources. When you run a search of the DMC event database, you will see all of the catalog entries available (for the parameters set) unless the "preferred" catalog option is selected. Setting the preferred option results in the selection of only those entries from the most accurate catalog available for the time period requested. (See an explanation of these catalogs on the event search help page) However, selecting preferred does not always result in just one entry per event being displayed because there may be more than one magnitude reported for the same event. This can be frustrating if all you are interested in is the number of events. To help combat this problem, the DMC has upgraded the SeismiQuery Event Search to include a grouping of events by location and time.
Your query returned 699 groups
and 1191 rows.
Group definition: time_delta = 5 and dist_delta = 1
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