|
Posted by Lowell on December 02, 2001 at 14:27:39:
STRONG EARTHQUAKE HITS NORTHERN HONSHU, JAPAN (MW 6.5)
LARGEST EARTHQUAKE AT MAMMOTH LAKES CA IN MORE THAN A YEAR FOLLOWS (ML 3.4) SUMMARY SUMMARY OF EFFECTS RELATED TO HONSHU JAPAN QUAKE - DEC 2, 2001 A strong earthquake occurred in northern Honshu, Japan this
morning. This earthquake initially registering Mb 6.5 was at 120 km depth,
and so probably will not cause much damage on the surface. For a brief news report see: http://abcnews.go.com/wire/World/ap20011202_869.html The event is currently located by NEIS as follows: O: 02DEC2001 13:01:53 39.5N 141.1E MB=6.5 NEIS EASTERN HONSHU, JAPAN http://quake.wr.usgs.gov/cgi-bin/quake/gldfs.cr.usgs.gov/name=quake HISTORY: This is the largest earthquake within 100 km of this epicenter
since March 28, 1985 when a Ms 6.8 occurred. The JMA catalog shows
12 earthquake have recorded with Ms>=6.5 in this area since 830 A.D.
A list of these event includes:
MO DA HR MN SC YEAR N LAT E LONG DEP MAG (MS)
2 2 15 0 0 830 39.080 140.010 0 7.3
7 13 0 0 0 869 39.000 141.600 0 8.6
10 17 15 0 0 1644 39.040 140.000 0 6.5
3 14 15 0 0 1832 40.070 141.060 0 6.5
8 27 15 0 0 1854 40.060 141.060 0 6.5
8 31 8 6 0 1896 39.500 140.700 10 7.2
5 11 17 23 0 1900 38.700 141.100 10 7.0
3 14 19 59 0 1914 39.500 140.400 10 7.1
11 3 16 19 0 1931 39.533 141.867 0 6.5
11 19 15 1 40 1940 39.000 141.800 50 7.1
4 30 2 26 21 1962 38.733 141.133 0 6.5
3 28 16 7 8 1985 40.295 140.587 164 6.5 The area has been relatively quiet in the past 16 years.
RELATION TO RECENT GEOMAGNETIC STORMS:
This earthquake occurs in the period of expected strong global seismicity
from the geomagnetic storms of 24 and 26 November. The daily report on Nov. 24 had stated: " The seismic watch will include regions between 125W and 55W and
between 125E and 55E and will extend for the next 5 days. The
largest events are most likely to occur 4-6 days following the
storm, i.e. on November 30 to December 2, 2001 and are most likely
to occur in one of these longitude bands and/or at high latitudes." This event occurred at moderately high latitudes, just outside
the expected zone of maximum triggering. IMMEDIATE SOLAR/GEOMAGNETIC EFFECTS:
The sun produced a strong Radio Burst which was observed on the earth
at 13:00 with the following parameters:
8700 + 1300 1300 1300 SVI G RBR 245 82 Source:
http://sec.noaa.gov/ftpdir/indices/events/20011202events.txt The radio burst was accompanied by a 2-3 minute reversal of the Hn
geomagnetic field between 13:00 and 13:03. Source:
http://sec.noaa.gov/ftpdir/lists/geomag/20011202_G8mag_1m.txt The Honshu quake followed less than two minutes after the radio burst. The quake also occurred at 37 degrees from the CMT epicenter of the
Kunlun Mts. great quake of Nov. 14 and may be a FFA from that earthquake. "The FFA forecast from that event had stated:
The most likely events of Mw>=6 in the next 10 days appear to be: ...Off East Coast of Honshu, or Southern Kuriles" It may also be of some interest that this earthquake occurred at the
edge of the s-wave shadow zone (106-107 degrees distant) from the strong
Ms 6.4 earthquake in Chiapas, Mexico on Nov. 28 and is at the same distance
from the current location of TD Olga off the northern coast of Cuba today. IMMEDIATE EFFECTS: Several apparent FFA have already occurred from this event including
a Ml 4.1 in eastern Turkey (Distance = 72 degrees) and a series of micro-
earthquakes at volcanic centers. Following is a description of some
of these effects noted in earthquake catalogs and on on-line seismograms: VOLCANIC MICROEARTHQUAKES: MT. HOOD, OREGON: A series of small earthquakes is occurring at Mt. Hood, OR, this morning. Some
of these
are apparently being triggered by surface waves from the Honshu earthquake this
morning. PNSN has thus far located 3 of 7 quakes in the area with the following
morning. PNSN has thus far located 3 of 7 quakes in the area with the following
parameters: O: 02DEC2001 14:33:25 45.3N 121.7W ML=1.8 PNSN SSW of Mount Hood, OR
O: 02DEC2001 14:10:05 45.3N 121.7W ML=2.4 PNSN SSW of Mount Hood, OR
O: 02DEC2001 13:34:17 45.3N 121.7W ML=1.0 PNSN SSW of Mount Hood, OR Mount Hood is located at 68 degrees from the Honshu earthquake
this morning. The LR wave would have arrived at this location at about
13:33 UT, and was accompanied by another event of Ml<1. A minute later
the first event above is listed at Mount Hood.
A very small earthquake also appears to have occurred as the LQ wave
arrived at 13:28.8. As the LQ wave arrived from the the long path
(360-68 degrees) at 15:01 a further disturbance is noted on the seismogram
for Mt. Hood. The other two events and later ones, not yet located
cannot be directly related to surface waves from Honshu. The Mt. Hood Seismogram can be seen at:
http://www.geophys.washington.edu/SEIS/PNSN/WEBICORDER/TDH_EHZ_UW.2001120212.ht
ml Mt Hood is not the only volcanic area in the U.S. which is shaking
to the beat of the Honshu quake this morning. Yellowstone is also
experiencing a series of tremors, apparently related to this strong
earthquake. Yellowstone is located at 74 degrees from the Honshu
quake, near an area where FFA are expected. YELLOWSTONE: Earthquakes have thus far been located in the Yellowstone area (MBMG)
at:
14:21:33 UT
15:04:45 UT
15:29:41 UT
16:17:02 UT
16:25:43 UT
and more Ignore the event of Md 3.9 recorded by the automatic system at 13:12:17
(#230) this is a bogus event from the arrival of the P-wave from Honshu. Without going into details, these do not appear to be surface wave
arrivals and represent a true strong increase in seismicity at Yellowstone
following the Honshu earthquake.
For parameter details see:
http://www.seis.utah.edu/helicorder/heli/yellowstone/Uuss.YDC_EHZ_WY.2001120200.
gif
For Seismogram see:
http://mbmgquake.mtech.edu/earthworm/cgi-bin/getlist?ClickEffect=4&StationClickE
ffect=4&MapName=Montana&LastDaysOnly=0&Start_Date=2001/09/06&Start_Time=02:45:45
&Lat=47.00&Lon=-110.00&LonWidth=14.00&LatHeight=9.00&&MaxZ=100.00&MinZ=0.00&MaxM
ag=10.00&MinMag=0.00&Start_Date=2001/09/06&Start_Time=02:45:45&Finish_Date=2050/
12/31&Finish_Time=23:59:59
MAMMOTH LAKES Similarly a series of small events also appears to be occurring in the
Mammoth Lakes region following the Honshu quake. These appear to begin
about 2 hours after the Honshu earthquake. This set of smaller events
was followed by the largest earthquake in more than a year in the
Mammoth Lakes area and by a strong aftershock sequence as follows: O: 02DEC2001 21:42:39 37.5N 118.8W ML=1.9 NCSN WSW of Toms Place, CA
O: 02DEC2001 21:41:10 37.5N 118.8W ML=1.2 NCSN WSW of Toms Place, CA
O: 02DEC2001 21:39:38 37.5N 118.8W ML=2.0 NCSN WSW of Toms Place, CA
O: 02DEC2001 21:39:05 37.5N 118.8W ML=1.6 NCSN WSW of Toms Place, CA
O: 02DEC2001 21:30:21 37.5N 118.8W ML=1.5 NCSN WSW of Toms Place, CA
O: 02DEC2001 21:26:49 37.6N 118.8W ML=3.4 NCSN WSW of Toms Place, CA For a seismogram see: http://quake.usgs.gov/cgi-bin/heliLV.pl?3&MDR_VHZ_NC_00&latest OTHER AREAS WHERE SEISMOGRAMS SHOW UNUSUAL ACTIVITY FOLLOWING HONSHU: NEW ZEALAND: Also check out the Cannon Point seismogram from New Zealand - the series of
earthquakes follows by several hours the Honshu earthquake after a very quiet
evening. Could these be at Ruapehu volcano? http://www.gns.cri.nz/news/earthquakes/latest_drum.html MT. BAKER, WASHINGTON: http://www.geophys.washington.edu/SEIS/PNSN/WEBICORDER/MBW_EHZ_UW.2001120212.htm
l THE GEYSERS, CALIFORNIA http://quake.usgs.gov/cgi-bin/helicorder.pl?3&GGP&latest GLOBAL A moderately strong (Mb 5.7) earthquake also occurred in the Santa
Cruz Islands this morning. Other event listed since the last report
with Mb>=4 have occurred in the Fox Islands (Aleutians, Alaska) (Mb 4.5);
off the Coast of Central America (Ml 4.0) and a series of three events
in eastern Turkey near Van and Hakkary (Ml 4.5, 4.2). U.S./CANADA The largest event listed since last report in the U.S./Canada region
was a Mb 4.5 in the Fox Islands, Alaska. One other Ml 3.1 was also
reported from the southern Alaska area today.
In the California/Nevada area the largest earthquake of the day occurred
as a Ml 3.4 near Tom's Place (Mammoth Lakes) following a swarm of micro-
earthquakes apparently associated with the Honshu quake this morning.
This is the largest earthquake in the Mammoth Lakes region in more than
a year - since Nov. 13, 2000 when a Ml 3.6 occurred. The largest regional
earthquakes this year have occurred north of the Mammoth Lakes area
with Ml 3.7 on May 26 and Feb. 17, 2001.
In addition two other earthquake of Ml>-2.5 have been reported -
a Ml 2.8 near Calexico, southern California and a Ml 2.7 at the Geysers,
northern California. Ml 2.1 also occurred near Coso Junction this
morning and near San Fernando (Ml 2.0) this afternoon.
As noted in the Summary section above, a number of volcanic
zones became active with microearthquake swarms following the Honshu
quake this morning. These areas included Mt Hood, OR where earthquakes
of Ml 2.4 and 1.8 were recorded shortly after the Honshu event, a
swarm in the Yellowstone N.P area. A Ml 2.7 had occurred east of
Yellowstone yesterday (Dec 1, 2001), but did not appear to be
related to the swarm at the Park this morning. Mt Baker WA, the Geysers CA
and Mammoth Lakes also appear to have been activated by the Honshu
surface waves.
No other events of Ml>=3 have been listed in the rest of the U.S. or
Canada, however since many observatories are closed for the weekend,
many events will not be parameterized until tomorrow (Monday Dec 3). NEW ZEALAND IGNS did not report any events today. The on-line seismogram was
quiet until the Honshu earthquake occurred this morning.
Following the arrival of surface waves from that event, the
seismogram showed a strong increase in activity with at least
3 regional events in the red (red on the seismogram indicates
an event which probably has Ml>3.5). The Kermadec Islands
did not show additional listed activity today. 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 quiet today. There was one solar flare
of M-class observed with the following parameters: Flare # START MAX END CLASS 8730 1409 1500 1548 M1.3 Because of the gradual onset of this flare, no seismic activity could
be directly associated with it. For general space weather conditions see:
http://sec.noaa.gov/today.html
For Solar flare data see:
http://sec.noaa.gov/ftpdir/indices/events/20011202events.txt TROPICAL STORMS OLGA Tropical Storm Olga bounced off of Hispaniola today making
a 120 degree turn straight north this morning. She is now hanging
over the Gulf stream waters and energizing off the coast of Florida.
Olga is expected to stall temporarily (2-3 days) north of Haiti before
regaining a path to the southeast. This is one of the most erratic paths I
have ever seen for a tropical storm, so with past advisories in mind, this
storm could have more surprises in store. For more on TD Olga's path see: http://www.wunderground.com/auto/HurricaneSite/tropical/tracking/at200117.html BESSI-BAKO Tropical Cyclone Bessi-Bako continues in the South Indian Ocean and
is moving slowly to the south-southwest. This storm is not expected to
impact regional seismicity significantly. For more details see:
http://www.wunderground.com/auto/HurricaneSite/tropical/sp200101.public.html
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. December 03 is the ninteenth day after the beginning of 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 Arctic MB>=4.0 30 1.9 0.05
India MB>=4.0 68 2.9 0.02
Hindu Kush MB>=4.0 14 2.0 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
Mammoth lakes MB>=3.0 -18 -2.1 0.05
EARTHQUAKE LISTINGS
GLOBAL
SOUTH PACIFIC ISLANDS
O: 02DEC2001 02:47:55 12.7S 166.6E MB=5.7 NEIS SANTA CRUZ ISLANDS
O: 02DEC2001 02:47:49 12.5S 166.8E Ms=5.1 GSSC SANTA CRUZ ISLANDS ASIA O: 02DEC2001 13:02 39.4N 141.3E Mj=6.3 NIED SOUTHERN_IWATE_PREF, JAPAN
O: 02DEC2001 13:01:53 39.5N 141.0E MB=6.5 NEIS EASTERN HONSHU, JAPAN
For more details see Summary Section above and the FFA forecast, mailed
separately. O: 01DEC2001 05:09:00 04.8S 101.7E Mb=5.4 ASC NW of Barhau So. Sumatera CENTRAL/SOUTH AMERICA O: 01DEC2001 23:54:48 12.8N 88.9W MC=4.0 SIS COAST OF CENTRAL AMERICA
O: 02DEC2001 01:57:26 12.7N 87.8W MC=3.9 SIS COAST OF CENTRAL AMERICA O: 01DEC2001 15:35:01 17.5N 95.1W ML=4.2 SSN VERACRUZ-OAXACA , MEXICO EUROPE/AFRICA/MIDDLE EAST O: 2DEC2001 17:05:22 37.7N 43.9E ML=4.2 KAN HAKKARY,TURKEY
Note: This event is probably an FFA from the Honshu earthquake earlier
in the day. It occurs at 72 degrees from that event at a distance and
in a region identified as as an area where strong FFA effects were expected: "71-73 degrees: ... Eastern Turkey" O: 2DEC2001 4:11:45 38.6N 43.3E ML=4.5 KAN VAN,TURKEY
O: 2DEC2001 2:46:46 38.6N 43.4E ML=3.2 KAN VAN,TURKEY
O: 02DEC2001 04:11:56 39.0N 43.6E Ms=3.6 GSSC TURKEY O: 01DEC2001 16:39:26 45.1N 11.5E Ml=3.9 MIX NORTHERN ITALY U.S/CANADA CALIFORNIA/NEVADA
O: 02DEC2001 21:42:39 37.5N 118.8W ML=1.9 NCSN WSW of Toms Place, CA
O: 02DEC2001 21:41:10 37.5N 118.8W ML=1.2 NCSN WSW of Toms Place, CA
O: 02DEC2001 21:39:38 37.5N 118.8W ML=2.0 NCSN WSW of Toms Place, CA
O: 02DEC2001 21:39:05 37.5N 118.8W ML=1.6 NCSN WSW of Toms Place, CA
O: 02DEC2001 21:30:21 37.5N 118.8W ML=1.5 NCSN WSW of Toms Place, CA
O: 02DEC2001 21:26:49 37.6N 118.8W ML=3.4 NCSN WSW of Toms Place, CA
Note: This is the largest earthquake in the immediate Mammoth Lakes region
since November, 2000. O: 2DEC2001 5:07:35 32.3N 115.2W ML=2.8 SCSN SSE of Calexico, CA O: 02DEC2001 21:49:06 34.3N 118.4W ML=2.0 SCSN NW of San Fernando, CA O: 02DEC2001 20:02:56 38.8N 122.8W ML=2.7 NCSN N of The Geysers, CA O: 02DEC2001 10:37:53 36.0N 117.9W ML=2.1 SCSN SE of Coso Junction, CA PACIFIC NORTHWEST/CANADA O: 02DEC2001 14:33:25 45.3N 121.7W ML=1.8 PNSN SSW of Mount Hood, OR
O: 02DEC2001 14:10:05 45.3N 121.7W ML=2.4 PNSN SSW of Mount Hood, OR
O: 02DEC2001 13:34:17 45.3N 121.7W ML=1.0 PNSN SSW of Mount Hood, OR
Note: Mount Hood is located at 68 degrees from the Honshu earthquake
this morning. The LR wave would have arrived at this location at about
13:33 UT, and was accompanied by another event of Ml<1. A minute later
the first event above is listed at Mount Hood.
A very small earthquake also appears to have occurred as the LQ wave
arrived at 13:28.8. As the LQ wave arrived from the the long path
(360-68 degrees) at 15:01 a further disturbance is noted on the seismogram
for Mt. Hood. The other two events and later ones, not yet located
cannot be directly related to surface waves from Honshu. The Mt. Hood Seismogram can be seen at:
http://www.geophys.washington.edu/SEIS/PNSN/WEBICORDER/TDH_EHZ_UW.2001120212.htm
l ROCKY MOUNTAIN AREA O: 01DEC2001 16:16:12 44.7N 110.0W ML=2.7 UUSN ENE of Fishing Bridge, WY O: 29NOV2001 21:30:52 38.5N 112.5W ML=2.0 UUSN W of Sevier, UT O: 02DEC2001 18:01:05 46.7N 112.4W MD=1.6 MBMG MONTANA
O: 01DEC2001 22:39:30 46.3N 112.1W MD=1.0 MBMG MONTANA O: 02DEC2001 18:11:05 44.7N 111.0W MD=0.2 MBMG YELLOWSTONE, WY
O: 02DEC2001 17:54:31 44.7N 111.0W MD=0.0 MBMG YELLOWSTONE, WY
O: 02DEC2001 16:25:43 44.7N 111.0W MD=0.5 MBMG YELLOWSTONE, WY
O: 02DEC2001 16:17:02 44.7N 111.0W MD=0.1 MBMG YELLOWSTONE, WY
O: 02DEC2001 15:29:41 44.7N 111.0W MD=0.3 MBMG YELLOWSTONE, WY
O: 02DEC2001 15:04:45 44.7N 111.0W MD=0.3 MBMG YELLOWSTONE, WY
O: 02DEC2001 14:21:33 44.7N 111.0W MD=0.2 MBMG YELLOWSTONE, WY
O: 02DEC2001 11:25:23 44.8N 111.0W MD=0.2 MBMG YELLOWSTONE, WY
O: 02DEC2001 06:01:19 44.7N 111.4W MD=0.2 MBMG HEBGEN LAKE MT
O: 01DEC2001 17:04:37 44.7N 111.0W MD=0.0 MBMG YELLOWSTONE, WY ALASKA O: 02DEC2001 08:55:45 58.3N 156.0W ML=3.1 AEIC ESE of Dillingham, Alaska O: 02DEC2001 00:11:38 53.0N 166.8W MB=4.5 NEIS FOX ISLANDS, ALEUTIAN ISLANDS
|
