MODERATE SEISMICITY CONTINUES IN NORTH AMERICA/MID-OCEAN RIDGES

SUMMARY

The delayed effects of the strong geomagnetic storm five days
ago continued today as North America saw moderate events in the
Jalisco, Mexico (Ml 4.6) and Colima, Mexico (Ml 4.5) regions and
in Central Alaska (Mb 4.5). Three events of Ml 2.8, 3.0 and 3.0
occurred in the California region in less than three hours this
afternoon at Coalinga, Ocotillo and Hollister respectively. Only
two events of Ml>=2.8 had occurred in the California region from
November 6 to November 12 - a Ml 3.3 in Burney and a Ml 3.0 near Calexico.
The largest events of the day occurred on mid-Ocean ridges
in the Pacific-Antarctic Ridge (Mb 5.5) and on the Northern
Mid-Atlantic Ridge (Mb 5.3). The Pacific-Antarctic event occurred in a region
where three indicators suggested heightened activity - it was a mid-ocean
ridge event within 20 degrees longitude of the sub-solar longitude (120W) at
the start of the geomagnetic storm and at a high latitude (50S).
Mid-ocean ridge systems had been expected to see larger events today as noted in
this report on November 6:

" This seismicity will probably be most prominent within
20 degrees longitude of 59W and 121E (anti- and sub-solar at 03:54 UT)
and within 120W and 60E (sub- and anti-solar at 20:00 UT, the start
of the storm sequence). Of course, as usual, high latitudes and areas
near the geomagnetic equator are also susceptible to induced seismicity.
near the geomagnetic equator are also susceptible to induced seismicity.
...Strongest seismicity (i.e. events of Mw>6 and in this case probably
at least one event of Mw>7) is most likely to occur 4-6 days after the
storm commencement in the sub- or anti-solar regions or at high
latitudes. This would place these events around 10-12 November.
Enhanced seismicity in volcanic regions (Volcanos or volcanic arcs and
MID-OCEAN RIDGES) should also increase around NOVEMBER 10-12."
[emphasis added]

GLOBAL

In other seismicity, the most active region was Central and South
America. In addition to the events described in the Summary for
Mexico, earthquakes of Ml>=4 also occurred in Costa Rica (Ml 4.3);
and Central Chile (Ml 4.2). In Europe a Ml 4.1 was observed north
of Cyprus in southern Turkey. The region of Cyprus has become
active with a number of light earthquakes in the past three days.

U.S./CANADA

The largest event listed in the U.S./Canada region today was
a Ml 4.5 in Central Alaska. Three other events of Ml>=3 also occurred
since the last report in the region of Alaska.
The swarm near Spokane, WA continued today with events of
Ml 3.3, 1.9 and 2.4 this morning. A light quake also occurred in
the Olympia, WA region (Ml 1.9) this afternoon. No new earthquakes
were listed by the Canadian network nor for the Central Rocky
Mountain region. A light earthquake was noted near New Madrid
which occurred on Nov. 10 (Ml 1.4).
In the California/Nevada region, in addition to the three events
of Ml>=2.8 discussed in the Summary above (at Calexico, Hollister
and Huron/Coalinga, CA), six other eventso of ML>=2 also occurred
today. These were at Calexico (Ml 2.9); Chester (Ml 2.3); Banning (Ml 2.1);
Mammoth Lakes (Ml 2.4); San Ramon (Ml 2.1) and Ocotillo (Ml 2.1).
The Ml 2.4 at Mammoth Lakes was the largest in that region in more
than two weeks. The event in San Ramon had been preceded by two
light foreshocks (Ml 1.9 and 1.8) which were discussed in yesterday's
report. The Calexico swarm is continuing from heightened activity
which began immediately after the geomagnetic storm of 6-7 November.
And the Chester earthquake is an aftershock of a larger Ml 2.5 that occurred
near that town on November 10.
No earthquakes of Ml>=3 were recorded in Hawaii today.

NEW ZEALAND

IGNS did not report parameters for any events today, however
the on-line seismogram shows a number of light to moderate regional
earthquakes especially over the past ten hours. Most of these
do not appear to have occurred in the immediate region of southern
North Island, so are probably off the east coast or north of North
Island.

The IGNS on-line Seismometer can be found at:
http://www.gns.cri.nz/news/earthquakes/latest_drum.html

GEOMAGNETIC/SOLAR FIELDS

The geomagnetic field remained at very quiet conditions today.
There was one M-class solar flare observed with the following
parameters:

Flare # START MAX END CLASS

3330 + 0752 0757 0801 M1.6

No seismicity was associated with this flare, however the LED
(Europe) network does identify an unlocated event at 08:00 UT.

For general space weather conditions see:
http://sec.noaa.gov/today.html
For Solar flare data see:
http://sec.noaa.gov/ftpdir/indices/events/20011112events.txt

TROPICAL STORMS

No tropical storms were located in the Caribbean Sea, North Atlantic,
east Pacific, west Pacific or Indian Oceans today.

TIDAL TRIGGERING (LUNAR)

Statistics have been done on many regions of the world in terms of
relationship of significant regional earthquakes with respect to lunar cycle.
Each report will summarize the most likely areas for tidal triggering
for the next day based on these statistics. It is expected
that tidal triggering will add an additional 0.5 - 1.0 units of
magnitude to events which are about to occur or will move these
events forward in time by up to seven days in the regions where
there is a statistical correlation between lunar phase and
earthquakes.

November 13 is twenty-eight days after the beginning the lunar month
Regions most likely to experience tidal triggering
on this day (With associated magnitude ranges; the percent change in
seismicity rate over background seismicity rate on this
day of the lunar month; statistical z-value and
significance level) are:

Region Magnitude range %change z-value Significance level

Alaska MB>=4.0 6 2.0 0.05
Aleutians MB>=4.0 40 3.1 0.01
New Britain MB>=4.0 25 2.6 0.03
So. California MB>=3.0 67 2.3 0.05

Regions expected to experience reverse triggering (i.e. they are
unlikely to experience a significant event at this period of the
lunar cycle) are:

Region Magnitude range %change z-value Significance level

Central So America MB>=4.0 -20 -2.0 0.05

EARTHQUAKE LISTINGS

GLOBAL

ASIA

O: 09NOV2001 03:14 35.9N 137.7E Mj=3.8 NIED WESTERN_NAGANO_PREF, JAPAN

O: 11NOV2001 18:36:59 5.8S 124.4E MB=4.8 NEIS BANDA SEA

O: 12NOV2001 23:48 35.4N 138.9E Mj=3.9 NIED EASTERN_YAMANASHI_PREF, JAPAN

O: 11NOV2001 18:13 33.2N 137.5E Mj=5.5 NIED FAR_S_OFF_SHIZUOKA_PREF, JAPAN

O: 10NOV2001 05:31 36.8N 141.4E Mj=3.9 NIED E_OFF_IBARAKI_PREF, JAPAN
O: 10NOV2001 04:02 37.1N 141.2E Mj=4.0 NIED E_OFF_FUKUSHIMA_PREF, JAPAN

O: 08NOV2001 08:00 25.0N 123.8E Mj=3.8 NIED NW_OFF_ISHIGAKIJIMA_IS, JAPAN
O: 10NOV2001 00:37 25.0N 122.9E Mj=4.3 NIED NW_OFF_ISHIGAKIJIMA_IS, JAPAN

O: 09NOV2001 03:14 36.0N 137.7E Mj=3.8 NIED WESTERN_NAGANO_PREF, JAPAN

O: 07NOV2001 17:14 36.2N 140.1E Mj=3.8 NIED SW_IBARAKI_PREF, JAPAN
O: 06NOV2001 08:41 35.9N 140.0E Mj=3.8 NIED SOUTHERN_IBARAKI_PREF, JAPAN

CENTRAL/SOUTH AMERICA

O: 12NOV2001 00:29:33 30.4S 71.3W ML=4.2 DGF NW of OVALLE, CHILE

O: 11NOV2001 23:16:12 18.5N 104.8W ML=4.5 SSN COSTA COLIMA , MX
O: 12NOV2001 06:49:35 19.1N 105.1W ML=4.6 SSN COSTA DE JALISCO , MX

O: 11NOV2001 16:37:02 16.4N 94.2W ML=4.1 SSN ISTMO DE TEHUANTEPEC , MX

O: 11NOV2001 12:43:34 16.0N 98.2W ML=4.1 SSN COSTA DE OAXACA , MX

O: 10NOV2001 10:50:16 16.1N 98.2W MB=4.6 CASC OAXACA, MEXICO
O: 10NOV2001 17:09:25 16.3N 98.0W MC=4.8 CASC OAXACA, MEXICO

O: 11NOV2001 06:14:26 9.7N 82.3W MC=3.9 CASC COSTA RICA, C.A.
O: 10NOV2001 20:39:45 9.9N 84.0W MC=4.0 CASC COSTA RICA, C.A.

O: 09NOV2001 09:09:43 10.4N 70.9W Mc=3.8 ULA Lagunillas, Venezuela
O: 09NOV2001 10:05:04 10.3N 70.8W Mc=3.4 ULA Lagunillas, Venezuela
O: 09NOV2001 21:46:34 10.3N 70.3W Mc=3.6 ULA Torres, Venezuela

O: 10NOV2001 04:30:37 6.6N 73.0W Mc=3.5 ULA Dpto. Santander, Colombia.
O: 11NOV2001 01:29:54 6.9N 73.2W Mc=3.7 ULA Dpto. Santander, Colombia.
O: 11NOV2001 07:08:15 7.5N 73.5W Mc=3.4 ULA Dpto. Santander, Colombia.
O: 11NOV2001 13:27:18 7.2N 72.8W Mc=3.6 ULA Norte de Santander, Colombia.

O: 11NOV2001 16:46:20 10.6N 87.0W MC=3.6 SIS COSTA RICA, C.A.
O: 12NOV2001 23:33:16 10.9N 86.9W ML=3.9 SIS COSTA RICA, C.A.
O: 12NOV2001 23:43:35 10.9N 86.9W ML=4.3 SIS COSTA RICA, C.A.
O: 13NOV2001 02:09:47 10.9N 86.9W ML=3.0 SIS COSTA RICA, C.A.

EUROPE/AFRICA/MIDDLE EAST

O: 12NOV2001 15:59:16 36.8N 34.7E ML=4.1 KAN MERSYN,TURKEY

O: 12NOV2001 00:34:21 39.1N 27.8E ML=3.6 NOA AEGEAN SEA, GREECE
O: 12NOV2001 00:34:16 39.2N 27.4E ML=3.2 KAN IZMIR,TURKEY

O: 12NOV2001 00:00:35 35.7N 22.0E ML=3.4 NOA CRETE, GREECE

O: 12NOV2001 00:49:34 63.7N 19.4W ML=3.1 ISO Iceland

O: 06NOV2001 18:05:28 55.9N 11.8E ML=2.6 HEL DENMARK REGION, FELT
Note: This was the first FELT event in Denmark this year.

O: 08NOV2001 02:00:13 72.6N 4.3E ML=4.4 HEL NORTH OF FENNOSCANDIA

O: 12NOV2001 07:06:54 38.5N 7.7W Ml=2.8 IMP PORTUGAL

OCEANIA

O: 12NOV2001 17:54:19 49.5S 116.0W MB=5.5 NEIS SOUTHERN EAST PACIFIC RISE
O: 12NOV2001 17:54:21 50.1S 115.4W Mb=5.5 NEIA SOUTHERN EAST PACIFIC RISE

O: 12NOV2001 10:11:15 22.1N 45.0W MB=5.3 NEIS NORTHERN MID-ATLANTIC RIDGE
O: 12NOV2001 10:11:28 24.0N 44.8W Ms=4.8 GSSC NORTHERN MID-ATLANTIC

U.S/CANADA

CALIFORNIA/NEVADA

O: 13NOV2001 00:22:42 31.9N 116.2W ML=3.0 SCSN SSW of Ocotillo, CA

O: 13NOV2001 2:33:59 32.8N 116.1W ML=2.1 SCSN NNW of Ocotillo, CA

O: 12NOV2001 23:53:01 36.2N 120.2W ML=2.8 NCSN WSW of Huron, CA

O: 13NOV2001 2:04:25 36.9N 121.4W ML=3.0 NCSN NW of Hollister, CA

O: 12NOV2001 21:34:17 37.8N 121.9W ML=2.1 NCSN ESE of San Ramon, CA

O: 12NOV2001 20:46:27 37.5N 118.8W ML=1.5 NCSN SW of Toms Place, CA
O: 12NOV2001 20:44:44 37.5N 118.8W ML=2.4 NCSN SW of Toms Place, CA

O: 12NOV2001 04:24:28 32.2N 116.5W ML=2.3 SCSN SE of San Ysidro, CA

O: 12NOV2001 14:09:59 33.9N 116.8W ML=2.1 SCSN E of Banning, CA

O: 12NOV2001 12:55:14 40.3N 121.4W ML=2.3 NCSN W of Chester, CA

O: 12NOV2001 9:49:44 32.3N 115.2W ML=2.9 SCSN SSE of Calexico, CA

PACIFIC NORTHWEST/CANADA

O: 12NOV2001 03:03:02 47.6N 117.4W MB=3.3 NEIS WASHINGTON
O: 12NOV2001 3:11:15 47.7N 117.4W ML=2.4 PNSN N of Spokane, WA
O: 12NOV2001 3:07:40 47.7N 117.4W ML=1.9 PNSN NNE of Spokane, WA
O: 12NOV2001 3:03:02 47.7N 117.4W ML=3.3 PNSN N of Spokane, WA

O: 12NOV2001 22:51:33 47.1N 123.1W ML=1.9 PNSN WNW of Olympia, WA

EASTERN U.S./CANADA

O: 10NOV2001 22:28:35 36.1N 89.8W ML=1.3 CERI S of 08 Hayti

ALASKA

O: 12NOV2001 15:51:06 60.3N 152.4W ML=3.3 AEIC NW of Homer, Alaska

O: 12NOV2001 14:11:03 62.1N 149.8W MB=4.5 NEIS CENTRAL ALASKA
O: 12NOV2001 14:11:04 62.0N 149.8W ML=4.2 AEIC SSE of Talkeetna, Alaska

O: 12NOV2001 22:50:34 62.0N 149.7W ML=3.0 AEIC SSE of Talkeetna, Alaska

O: 13NOV2001 03:52:02 56.9N 156.6W ML=3.4 AEIC SW of Anchorage, Alaska