121 Degrees Longitude

Michael Hall writes me that Maupin earthquakes fascinates him as well and was struck by my allusion to longitude 121 degrees. He did some research and this is what he found. (Michael gave me permission to quote him.)

…(From the) Advanced National Seismic System website, I did a search surrounding your identification of numerous earthquakes at or near longitude -121, and the general conclusion of many that there has been a marked increase in events in the Northwest recently, particularly in the last few weeks. The search looked at earthquakes from January 1 to March 15, 2007, that were located between Longitude -119 and -123; and Latitude 35.0 to 50.0. This slice of geography is essentially the region from the Mammoth Lakes, CA area to the U.S.-Canadian border within that range (-119 to -123). The search was for those events that were of magnitude 2.0 and greater.From January 1st to March 15th, there were 375 earthquakes surrounding the -121 point you identified. The data show an increase in the number per day over this period. In January, there were 130 events over 31 days or 4.19 per day. In February, there were 145 events over 28 days or 5.18 per day. And, in only 15 days in March (Mar 1-15), there were 100 events or 6.67 per day. The average number of quakes per day–from the January average to the present average up to March 15th–has increased almost two-and-a-half quakes per day (2.48), a 59 percent increase. There does not seem to be an increase in the average magnitude of these quakes, however. In January, the average magnitude was 2.3; in February, 2.3; and in the first fifteen days of March, 2.4. This does not, of course, preclude quakes of greater magnitude in remainder of the month (or anything else for that matter).

Michael Hall Maupin 121 Degrees Earthquakes Mover Mike

2 Responses to “121 Degrees Longitude”

  1. “allusion”…I thought those were in the Alaskan island chain. lol

  2. TF, Allusion is a brief reference to a person, event, or place, real or ficticious, or to a work of art. “What!” you say. “Oh, thats different. Nevermind!”

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