Strong coastal earthquake near Iwaki, Honshu, Japan

Iwaki beaches Japan

FINAL UPDATE 11:35 PM UTC : After checking our many sources, we have the pleasure to conclude that NO damage or injuries have been reported for this earthquake.

UPDATE 4:35 PM UTC : Inhabitants of Iwaki town (10th largest city in Japan!) have felt this earthquake as a JMA 3 = approx. IV MMI = light shaking

UPDATE 4:15 PM UTC : JMA  (Japan) reported a magnitude of 5.3 at a depth of 50 km.  Earthquake-Report always gives as much data as possible as this often explains the way people are experiencing the earthquake.  The difference in depth at this magnitude explains 2 elements :
a) the earthquake is felt several hundreds of km from the epicenter  (the Felt radius increases with the bigger depth)
b) the shaking is usually less severe with a depth of 50 km (intermediate depth) than with a shallow depth of 28 km.

UPDATE 3:51 PM UTC : Japanese people are working very well together with their Meteorological Services. If they feel an earthquake, almost immediately thereafter a Felt report is filled in.
Click on the link to see all the Felt information collected from Japanese people after this earthquake.
You will notice that this earthquake was felt in about 50% of Honshu island (millions of people).

UPDATE 2:05 PM UTC : There is news from JMA - reporting an Intensity of 4 JMA, in 4 cities/towns.
Motooka, Ookuma, Niiyama, Futabachō Namie. There is a slight chance of damage in these cities/towns.

JMA 4 intensity explanation - Many people are frightened. Some people try to escape from danger. Most sleeping people awake. Hanging objects swing considerably and dishes in a cupboard rattle. Unstable ornaments fall occasionally. Electric wires swing considerably. People walking on a street and some people driving automobiles notice the tremor.
IV JMA can be compared with a VI MMI shaking = strong shaking

UPDATE 2:00 PM UTC : The epicenter area lies on the upper subduction zone. (can be clearly seen on the satellite map)

UPDATE 1:59 PM UTC : Iwaki is a city located in the southern part of the Hamadōri coastal region.
Iwaki is the 10th largest city in Japan (2010).
Its population is 344,570 (2010).
Iwaki is well-known as one of the most comfortable areas in Japan because it is situated in a temperate climate zone and has a moderate climate.
The city works as an industrial hub of Tōhoku region, and is rich in sightseeing resources.
About 7.6 millions sightseers visit the city a year. (Source Wikipedia)
Read also our  in-depth article on EARTHQUAKES and TOURISTS - Click here

UPDATE 1:45 PM UTC : Still NO news from JMA (Japan)

UPDATE 1:40 PM UTC : QuakeSOS, our iPhone application gets I AM SAFE messages out of Tokyo, which means that this earthquake has been felt until Tokyo, 210 km from the epicenter.

UPDATE 1:40 PM UTC : The in Japan installed seismograph shows a very strong but probably short shaking (good news. Click on this link to see the seismogram at Matsushiro.

UPDATE 1:35 PM UTC : EMSC reports a magnitude of 5.5 at a depth of 40 km
JMA (Japan) has NO rUPDATE 1:35 PM UTC :eport published yet. As soon as it is published, we will bring it to you.

A strong shallow seaquake struck at 10 PM in the evening just out of the Iwaki coast. Iwaki is a very big city with 357,309 inhabitants.
Japan is one of the best  earthquake-resistant organized countries in the world.
Even whit such an earthquake prepared population, a shock like tonight's shock is still experienced as a scaring event.

Most important Earthquake Data:
Magnitude : 5.4
UTC Time : Thursday, February 10, 2011 at 13:03:02 UTC
Local time at epicenter :  Thursday, February 10, 2011 at 10:03:02 PM at epicenter
Depth (Hypocenter) : 28.6 km
Send an "earthquake experience report" for this earthquake
Geo-location(s) :
34 km (21 miles) ENE (78°) from Iwaki, Honshu, Japan
98 km (61 miles) SE (133°) from Fukushima, Honshu, Japan

Links to important maps
USGS Did You Feel It Map
Google satellite map of the area showing the kind of terrain the earthquake took place

3-dimensional view of the earthquake area (USGS epicenter location)
USGS historic earthquakes map

USGS Seismic hazard map

LIVE SEISMOGRAM (nearest Seismograph station)

QuakeSOS+ is an iPhone application developed by Armand Vervaeck, the creator and main contributor to Earthquake Report. The Application simplifies immediate group communication to friends and family members (with your exact GPS location) and is constantly feeding the users with œEarthquake Report news. Together with your own family and friends, QuakeSOS+ will be your closest earthquake friend. Buying QuakeSOS+ will support the activities of SOS Earthquakes.

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