grazie prof :)
--- Ven 11/3/11, Salvatore Barba <salvatore.ba...@ingv.it> ha scritto:
Da: Salvatore Barba <salvatore.ba...@ingv.it>
Oggetto: [IGL] Fwd: M 8.9 NEAR THE EAST COAST OF HONSHU, JAPAN March 11, 2011 05:46:23 --Version 1
A: indagine-geofisica-della-litosfera@googlegroups.com
Data: Venerdì 11 marzo 2011, 10:05
Salve a tutti,
vi inoltro delle informazioni (con i link per le news) sul terremoto
in Giappone.
buona giornata
Salvatore
----- Messaggio inoltrato da b...@usgs.gov -----
Data: Fri, 11 Mar 2011 01:17:34 -0700 (MST)
Da: b...@usgs.gov
Oggetto: M 8.9 NEAR THE EAST COAST OF HONSHU, JAPAN March 11, 2011 05:46:23 --Version 1
A: salvatore.ba...@ingv.it
Message Template
NEIC EVENT EXECUTIVE SUMMARY
MW 8.9 NEAR THE EAST COAST OF HONSHU, JAPAN
MARCH 11, 2011 05:46:23
/Version /1
38.322N 142.369E Depth 24km
LOCATION LAST UPDATED AT 03/11/2011 00:49:48 (Mountain Time)
EVENT COORDINATOR: Benz, Harley M.(b...@usgs.gov[1])
Nearest Cities
130 km (80 miles) E of Sendai, Honshu, Japan
178 km (110 miles) E of Yamagata, Honshu, Japan
178 km (110 miles) ENE of Fukushima, Honshu, Japan
373 km (231 miles) NE of TOKYO, Japan
Tectonic Summary
The March 11, 2011 earthquake (preliminary magnitude 8.9) near the
east coast of Honshu, Japan, occurred as a result of thrust faulting
on or near the subduction zone interface plate boundary between the
Pacific and North America plates. At the latitude of this earthquake,
the Pacific plate moves approximately westwards with respect to the
North America plate at a velocity of 83 mm/yr. The Pacific plate
thrusts underneath Japan at the Japan Trench, and dips to the west
beneath Eurasia. The location, depth, and focal mechanism of the March
11 earthquake are consistent with the event having occurred as thrust
faulting associated with subduction along this plate boundary. Note
that some authors divide this region into several microplates that
together define the relative motions between the larger Pacific, North
America and Eurasia plates; these include the Okhotsk and Amur
microplates that are respectively part of North America and Eurasia.
The March 11 earthquake was preceded by a series of large foreshocks
over the previous two days, beginning on March 9th with an M 7.2 event
approximately 40 km from the March 11 earthquake, and continuing with
a further 3 earthquakes greater than M 6 on the same day.
The Japan Trench subduction zone has hosted 9 events of magnitude 7
or greater since 1973. The largest of these was an M 7.8 earthquake
approximately 230 km to the north of the March 11 event, in December
1994, which caused 3 fatalities and almost 700 injuries. In June of
1978, an M 7.7 earthquake 75 km to the southwest caused 22 fatalities
and over 400 injuries. In December of 2008, a sequence of 4 moderate
earthquakes (M 5.3-5.8) occurred within 20 km of the March 11 event.
In the first 12 hours following the March 11 earthquake, the region
has experienced over a dozen aftershocks of M 5 or greater, the
largest being M 5.7.
TALKING POINTS
* Occurred on the interface between the North America and Pacific
plates
* This portion of the subduction zone has a history of M7 or larger
earthquakes
* Largest earthquake within 250 km was a M8.4 in 1933
* Preceded by a M7.2 and 3 M6+ foreshocks on March 9, 2011
* Tsunami warning for the Hawaiian Islands
Historical Seismicity
YRMNDAY HRMIN LAT LON DEP MAG DIST. M8.9
1978/06/12 08:14 38.22 142.01 53.3 7.7 33.26 km
2011/03/09 02:45 38.42 142.84 32.0 7.2 42.37 km
1915/11/01 07:24 38.30 142.90 35.0 7.5 46.39 km
1938/11/06 08:53 37.29 142.28 35.0 7.7 115.33 km
1938/11/05 10:50 37.11 142.08 35.0 7.8 137.34 km
1938/11/05 08:43 37.01 142.05 35.0 7.9 148.75 km
1960/03/20 17:07 39.87 143.44 2.1 7.8 195.25 km
1938/05/23 07:18 36.46 141.76 35.0 7.7 214.24 km
1933/03/02 17:31 39.22 144.62 35.0 8.4 219.54 km
1931/03/09 03:48 40.48 142.66 35.0 7.7 241.72 km
1901/08/09 18:33 40.60 142.30 35.0 7.5 253.36 km
1994/12/28 12:19 40.53 143.40 29.2 7.8 261.07 km
1964/06/16 04:01 38.43 139.23 13.1 7.5 274.23 km
1968/05/16 00:49 40.90 143.35 25.8 8.3 298.93 km
1968/05/16 10:39 41.59 142.79 11.8 7.8 365.43 km
1983/05/26 03:00 40.47 139.08 20.0 7.7 369.82 km
1923/09/02 02:46 34.90 140.20 35.0 7.6 426.87 km
1909/03/13 14:29 34.50 141.50 35.0 7.6 432.02 km
1923/09/01 02:58 35.41 139.08 35.0 7.9 436.51 km
1953/11/25 17:48 34.03 141.79 35.0 7.9 479.64 km
1972/02/29 09:23 33.38 140.88 58.8 7.5 565.93 km
1906/01/21 13:49 34.00 137.00 350.0 7.7 680.37 km
1927/03/07 09:27 35.80 134.92 9.6 7.6 717.26 km
1944/12/07 04:35 33.75 136.00 0.0 8.1 765.38 km
AFTERSHOCKS
M7.1 approximately 40 minutes after mainshock and 6 M6+ earthquakes
within the first hour and 40 minutes
STYLE OF FAULTING: Thrust
W PHASE MOMENT TENSOR
11/03/11 5:46:23
Epicenter: 38.321 142.369
MW 8.9
USGS/WPHASE CENTROID MOMENT TENSOR
11/03/11 05:46:23.00
Centroid: 37.321 141.769
Depth 24 No. of sta: 89
Moment Tensor; Scale 10**22 Nm
Mrr= 1.16 Mtt= 0.18
Mpp=-1.34 Mrt= 1.33
Mrp= 2.17 Mtp=-0.10
Principal axes:
T Val= 2.88 Plg=55 Azm=313
N = -0.08 11 205
P = -2.79 32 108
Best Double Couple:Mo=2.8*10**22
NP1:Strike=162 Dip=17 Slip= 45
NP2: 28 78 102
PAGER POPULATION EXPOSURE
Estimated Population Exposed to Earthquake Shaking
Intensity Population
I ---
II-III ---
IV ---
V ---
VI 2,472K
VII 7,986K
VIII 2,598K
IX 0
X 0
REPORTED DAMAGE
Reports of tsunamis across eastern Honshu.
Fires and landslides also reported along the coast.
Links to News Articles
http://www.msnbc.msn.com/id/42023385/ns/world_news-asiapacific/
http://www.bbc.co.uk/news/world-asia-pacific-12709598
http://www.cnn.com/2011/WORLD/asiapcf/03/11/japan.quake/index.html?hp...
http://www.reuters.com/article/2011/03/11/us-japan-quake-idUSTRE72A0S...
USGS EVENT LINK
http://earthquake.usgs.gov/earthquakes/eqinthenews/2011/usc0001xgp/[2]
Prompt Assessment of Earthquakes for Response
http://earthquake.usgs.gov/earthquakes/pager/events/us/c0001xgp/index...[3]
/IF THERE ARE ANY CHANGES, SUGGESTIONS, QUESTIONS, OR COMMENTS ABOUT
THIS PARTICULAR EMAIL, PLEASE CONTACT BELL...@USGS.GOV/
Link:
-----
[1] mailto:b...@usgs.gov
[2] http://earthquake.usgs.gov/earthquakes/eqinthenews/2011/usc0001xgp/
[3] http://earthquake.usgs.gov/earthquakes/pager/events/us/c0001xgp/index...
----- Fine messaggio inoltrato. -----
--Salvatore Barba
Istituto Nazionale di Geofisica e Vulcanologia
Via di Vigna Murata 605
I - 00143 Roma
Phone n. +39-0651860362
Mobile +39-3478449422
Skype sal.barba
Web http://www.salvatorebarba.com/
Geology is an exact science...
unfortunately 90% of the evidence has been subducted.
If a slide cannot be understood in 4 seconds, it is a bad slide (R.A. Day)
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