Today was my second offical attempt to ride my first “Century Ride”. The goal: 100 miles (161 km). I ended up taking a detour from my route, got a flat on the way home and ende up with around 97.5 miles (157 km). Still, it was a fantastic ride. I love the summery green mountains in Japan.
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Magnitude 8.9 - NEAR THE EAST COAST OF HONSHU, JAPAN
2011 March 11 05:46:23 UTC
Earthquake Details
- This is a computer-generated message — this event has not yet been reviewed by a seismologist.
Magnitude 8.9 Date-Time
- Friday, March 11, 2011 at 05:46:23 UTC
- Friday, March 11, 2011 at 02:46:23 PM at epicenter
- Time of Earthquake in other Time Zones
Location 38.322°N, 142.369°E Depth 24.4 km (15.2 miles) set by location program Region NEAR THE EAST COAST OF HONSHU, JAPAN Distances 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, JapanLocation Uncertainty horizontal /- 13.5 km (8.4 miles); depth fixed by location program Parameters NST=350, Nph=351, Dmin=416.3 km, Rmss=1.46 sec, Gp= 29°,
M-type=”moment” magnitude from initial P wave (tsuboi method) (Mi/Mwp), Version=ASource
- USGS NEIC (WDCS-D)
Event ID usc0001xgp
- Did you feel it? Report shaking and damage at your location. You can also view a map displaying accumulated data from your report and others.
Earthquake Summary
Tectonic Summary
The 03/11/2011 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 260 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 35 km to the southwest caused 22 fatalities and over 400 injuries.
Earthquake Information for Asia
Earthquake Information for Japan
Seismicity of the Earth 1900 to 2007, Japan and Vicinity Map
Earthquake Maps
Scientific & Technical Information
Tsunami Information
The earthquake locations and magnitudes cited in NOAA tsunami statements and bulletins are preliminary and are superseded by USGS locations and magnitudes computed using more extensive data sets.
NOAA Tsunami Bulletins for this Earthquake
- Tsunami warning/watch/advisory for US west coast, British Columbia, and Alaska
- Tsunami warning/watch/advisory for US west coast, British Columbia, and Alaska
- Tsunami warning/watch/advisory for US west coast, British Columbia, and Alaska
General Tsunami Information
- Preliminary Earthquake Report
- U.S. Geological Survey, National Earthquake Information Center:
World Data Center for Seismology, Denver
Once in a lifetime. well at least I hope it is only once in a lifetime.
Just had another aftershock.. as I was posting…
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