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False alarms
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Posted by Lowell on July 16, 2001 at 09:00:52:
NEIS is now placing at least one of the two unusual events off the coast of No. California at a more mundane epicenter, it would not surprise me if the other will soon be relocated as well. The new epicenters appear to be around 40.3N 127W in an area where such events are common. In general practice, unusual epicenters given by local networks, especially for events outside the network coverage, should be viewed as suspect. They are usually wide off the mark. Only with global coverage can these events be placed within reasonable distance of the "true" epicenter. It is always wise to look at the quality rating of an epicenter - this will aid the user of earthquake lists to be a bit wiser in their use. My post on "poor locations" below shows how this applies to these two poorly located (by NCSN) events. This is a good chance for all of us to learn a bit about wise use of earthquake catalogs.
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