QUIET CONDITIONS GENERALLY PREVAILED TODAY

GLOBAL

Global seismicity was at fairly low levels today. No earthquakes of
Mb>=5 were reported by NEIS, however MEDNET did show an event of
MB 5 in the region of Bali early on the 20th of September. The only
events listed by NEIS of Mb>=4 today were a Mb 4.4 in the Rat
Islands, Aleutians and a Mb 4.7 in Guatemala. MEDNET also identified
a minor event of Mb 4.3 in Buru, Indonesia.

U.S./CANADA

Seismicity in the United States and Canada was also at fairly
quiet conditions today (September 19). As usual, the strongest events
in the region occurred in the Alaska area with the Mb 4.4 in the
Rat Islands and with a Ml 3.7 in the border area between Alaska and
the Yukon Territory. A Mb 3.6 was also recorded in Hawaii today.
In California/Nevada area there were no events of Ml>=2.5 today,
continuing a nearly two-week quiet period for this region. The
largest events occurred at Mammoth Lakes and the Geysers both of
which recorded an event of Ml 2.4. Other earthquakes of Ml>=2
occurred at Markleeville, Big Bear and San Simeon.
No events of Ml>=2 were reported from the east or Central U.S.
or Canada today.
In the Pacific northwest, the swarm south of Vancouver Island
continued, but with reduced intensity. No events of Ml>=4 occurred
in that area today. A swarm which began several days ago is continuing
in the Mt. St. Helens, WA area. So far, only small microquakes have
occurred, but magma is moving, and we may see a larger event in the
next several days in this area.
GEOMAGNETIC/SOLAR FIELDS

The geomagnetic field was at quiet conditions today. No solar
flares of M- or X- class were observed.

For general space weather conditions see:
http://sec.noaa.gov/today.html
For Solar flare data see:
http://sec.noaa.gov/ftpdir/indices/events/20010919events.txt

TROPICAL STORMS

The only tropical storm affecting North or Central America
today was TD9, a tropical depression which formed over Nicaragua
and Costa Rica over the past 24 hours. Earthquakes of Mb 4.6, 4.7 and
5.0 have occurred in the area of this tropical depression in the
past 24 hours in the region of Guatemala and El Salvador. For
tracking details see:

http://www.wunderground.com/auto/HurricaneSite/tropical/tracking/at200109.html