Tuesday, April 15, 2014

Challis Idaho earthquake cluster


Now, we can say this is a perfectly natural cluster, of no fixed explanation.

It's absolutely in the middle of a nowhere even more nowhere than Oklahoma City.  Just ugly barren hills.

Does it mean anything?  Probably not, since it will be the 19 times out of 20 where these things just fade away.  It is almost always caused by some sort of fluid migration.

Extra note:  The big earthquake around here is the 1983 Borah Peak earthquake, M6.9.  It was an extension (normal) earthquake, so the ground motion PGV was tiny.  Really, I wouldn't get too excited about these earthquakes, unless you live in loose bricks on a swamp.  This is real earthquake country, so live in something decent.

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