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Re: Magnitude 0.0 Earthquake

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sedas(--nospam--at)gldmutt.cr.usgs.gov:

. > Magnitude 0.0 earthquake in SOUTHERN ALASKA

. >     The following information is provided by the USGS 
. > National Earthquake Information Center.  This information
. >         is preliminary and subject to revision.

. > A magnitude 0.0 earthquake in SOUTHERN ALASKA has occurred at:
. > 60.50N 152.17W  Depth 119km  Thu May 24 01:07:01 2001 UTC

. > Time: Universal Time         (UTC) Thu May 24 01:07:01 2001
. >       Eastern Daylight Time  (EDT) Wed May 23 21:07:01 2001
. >       Central Daylight Time  (CDT) Wed May 23 20:07:01 2001
. >       Mountain Daylight Time (MDT) Wed May 23 19:07:01 2001
. >       Pacific Daylight Time  (PDT) Wed May 23 18:07:01 2001

. > Location with respect to nearby cities:
. >      30 miles (50 km) W of Kenai, Alaska (pop 
. > 6,000)                           
. >      65 miles (100 km) NNW of Homer, Alaska (pop 
. > 3,000)                        
. >      90 miles (150 km) WSW of Anchorage, Alaska (pop 
. > 226,000)                  
. >      640 miles (1035 km) WNW of JUNEAU, 
. > Alaska                                 

. > For additional information, including a map for this event please
. > consult this web page:
. > <http://neic.usgs.gov/neis/bulletin/010524010701.html>

. > Further information can be obtained from the USGS National 
. > Earthquake Information Center at <http://neic.usgs.gov/>,
. > the USGS Earthquake Hazards Program at <http://earthquake.usgs.gov/>,
. > and the USGS home page at <http://www.usgs.gov/>


Does this mean that there was an earthquake with no energy release in 
Southern Alaska, or that there wasn't an earthquake?  If there wasn't an 
earthquake, how did they determine it didn't happen precisely at the times 
indicated?

A. Roger Turk, P.E.(Structural)
Tucson, Arizona

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