OBSERVED GROUND MOTION WITH STRONG GEOMAGNETIC STORM TODAY

It is not generally known that ground motion is associated with
the onset of strong geomagnetic storms. The geomagnetic storm which
started at 16:48 UT is being well recorded on many high-latitude
seismometers. To see the associated ground motion look at the following
seismographic records on the USGS on-line seismograms at:
URL:
http://aslwww.cr.usgs.gov/Seismic_Data/heli2.htm

GT/VNDA - undulatory motion beginning at 16:48 (Antarctica)
COLA - strong undulatory motion beginning at 16:49 (College Alaska)
IU/KBS - strong undulatory motion beginning at 16:50 (Spitzbergen Norway)
KONO - strong undulatory motion beginning at about 18:00 (Norway)
There is an unexplained delay in this motion
SNZO - strong Undulatory motion beginning at 16:48 (New Zealand)
SPA - undulatory motion beginning at 16:48 (South Pole)
TIXI - very strong undulatory motion beginning at 16:48 (Siberia)
ULN - strong undulatory motion beginning at 16:46 or 16:47 (Mongolia)
YAK - strong undulatory motion beginning at 16:49 (Siberia)

Also see the PGC broad-band seismometer at:
http://www.pgc.nrcan.gc.ca/seismo/seismos/24hr-PGC.LHZ.shtml

So those looking for a physical mechanism by which sudden commencement
geomagnetic storms may trigger earthquakes need look no further than
these seismograms for related ground motion which could trigger
additional seismic activity.

Information on the geomagnetic storm is available at:
http://sec.noaa.gov/ftpdir/lists/geomag/20011021_G8mag_1m.txt
and
http://sec.noaa.gov/today.html

• Global seismograms