Hi-


I am a retired Scientist from Lawrence Livermore National Laboratory, and
I just received the following from a colleague. I thought it would be of
interest to those of us who are interested in detection and
classification of quakes:


Scientists have found a way to distinguish seismic waves.



Researchers have devised a technology that can distinguish mine collapses
from other seismic activity.


Using the large seismic disturbance associated with a Utah mine collapse
last August, Lawrence Livermore National Laboratory scientists and
colleagues from the Berkeley Seismological Laboratory at the University
of California, Berkeley applied a method developed to detect underground
nuclear weapons tests to quickly examine the seismic recordings of the
event, and determine whether that source was most likely from a
collapse.


The collapse of the Crandall Canyon mine in Utah registered as a 3.9
magnitude event. Using a full seismic waveform matching technique, the
team of researchers have devised a method to better differentiate
underground nuclear tests from earthquakes, mine collapses, mine blasts
and other events that generate seismic waves.


The new research appears in the July 11 edition of the journal
Science. For more information, see



https://publicaffairs.llnl.gov/news/news_releases/2008/NR-08-07-03.html






George Bush

Sea Ranch, CA, USA

38.73775N, 123.48882W