Not too far....If the University of Minnesota has a seismometer, it does not
have a public link.  It appears that the three closest stations are part of
the US Array and are Ann Arbor, MI, Ely, MN, and Sioux Falls, SD.  

When the twin towers went down on 9/11, the impact of the airplanes and
subsequent collapses were recorded at the PAL site, about 30 miles north.  I
don't know the weight of the bridge that collapsed or each of the twin
towers, but I imagine that the towers were significantly heaver.

Bob Hancock

-----Original Message-----
From: psn-l-request@.............. [mailto:psn-l-request@............... On
Behalf Of Thomas Dick
Sent: Thursday, August 02, 2007 08:07
To: psn-l@..............
Subject: bridge collapse

How far away was the bridge collapse in Minneapolis-St Paul detected? Anyone

know? 

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