Looks like a CME finally arrived about 03:21 this morning (UT).
There is a sudden decline at that time in the geomagnetic Total
field and a reversal of the earth-directed He field. The change
in the total field is about 15%. For minute-to-minute details see:
http://sec.noaa.gov/ftpdir/lists/geomag/20011028_G10mag_1m.txt
For graphics see:
http://sec.noaa.gov/today.html
Seismograms at Guam, College Outpost, Alaska, So. Karori, New
Zealand and Yakutsk all recorded this event with moderate to light
down motions. As usual the strongest reading was from So. Karori,
New Zealand. All these instruments were on the sun-lit hemisphere
at the time of the event. no instrument on the darkened hemisphere
recorded the event as far as I can tell at this time.

For seismograms see:
http://aslwww.cr.usgs.gov/Seismic_Data/heli2.htm

• USGS world-wide seismograms