More than 50 million people have felt today’s 6.2 magnitude aftershock in Honshu, Japan

Last update: September 15, 2011 at 9:49 pm by By

Earthquake overview : A very strong 6.2 magnitude aftershock struck on 17:00 (05:00 PM) local Japanese Time approx. 70 km out of the Honshu coast. A maximum moderate shaking was experienced, but tens of millions of people have felt this aftershock and are once again reminded at the destructive March earthquake and tsunami.
"I have Felt it" Reports –> see below + Let us know "how you have felt this earthquake"
To read the full story as it happened, we advise our readers to start at the lower part of the page (earthquake data).

Keep this page open or return regularly as we will be back with more details when they become available

Update : The main problem with people feeling an earthquake is that they never know whether is is close by or far away from them. A logical result of this, is that people will try to find information asap and start calling and txt'ing to each other which often result in congested lines.

Update : Earthquakes from this intensity do NOT cause any problems for the nuclear power plants .

Update : A max. 4 JMA intensity earthquake cannot be considered as dangerous. We trust on the Japanese way of handling dangerous earthquakes and based on our experience at least a 5+ is needed to create damage and eventually injuries (even most of the 5+ intensity earthquakes are not resulting in damage or injuries).  So, we do not expect any problems from this one.

Update :  Data from other seismological agencies :
JMA (local Japan agency) : 6.2 @ 10 km depth
USGS : 6.2 @ 10 km depth
EMSC : 6.0 @ 40 km depth
GFZ : 6.2 @ 26 km depth

Max. JMA intensity 4 (on a scale from 0 to 7).
JMA has reported a magnitude of 6.2 at a shallow depth of 10 km.
The earthquake occurred far enough out of the Japanese coast to be harmless.
There is NO tsunami warning or advisory in place for this earthquake
This is an aftershock of the massive destructive earthquake earlier this year.
I Have Felt It reports out of Tokyo report a "Light MMI IV" shaking.
USGS has calculated that 5,112,000 people will have experienced a moderate MMI V shaking. 46,430,000 a light shaking

  • "I Have Felt It" reports as received by Earthquake-Report.com

MMI values (if indicated) after the text (III: Weak shaking, IV Light shaking, V Moderate shaking, VI Strong shaking, VII Very Strong shaking)
Tokyo : Light shaking indicated
Tokyo, Narita Airport: I felt it at Narita airport. My feet shook from side to side but that`s it. I wasn`t even sure it was one at first!
Tokyo: mild shaking at approx 16.50 local time
Ikebukuro, Tokyo : Was in my 10th floor office. Very sudden acceleration. Walls creaked. Moved for about 30 seconds before settling to the recovery sway. Had us nervous but no real problems
Tsuchiura: Experienced light shaking at 5:27am and 5:33am local time lasting less than 30 seconds each time

EMSC Felt reports
Yokusuka (191 km from the epicenter): It was long, 15 to 20 seconds.
Taito (191 km from the epicenter) : first earthquake we have experienced. room on 6th floor of hotel felt like it was wobbling.

Most important Earthquake Data:
Magnitude : 6.2
UTC Time : Thursday, September 15, 2011 at 08:00:07 UTC
Local time at epicenter : Thursday, September 15, 2011 at 05:00:07 PM at epicenter
Depth (Hypocenter) : 10 km
Geo-location(s) :
74 km (46 miles) E (96°) from Mito, Honshu, Japan
94 km (58 miles) SSE (157°) from Iwaki, Honshu, Japan

Links to important maps
USGS Did You Feel It Map
Google satellite map showing the epicenter and the surrounding area.
Historic earthquakes map
Seismic hazard map
Shaking map
Focal mechanism report
Human impact map
GDACS earthquake report
 

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I did feel it – Ik heb het gevoeld – Το έκανα αισθάνεται – Yo lo siento – 我的确感到了 – 私はそれを感じていました- Ich habe es gefühlt – Bunu hissediyorum yaptı – لم أشعر أنه

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Tell us where in which location you felt the earthquake
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Your Email address might help us if we request for additional details about your experience. This field is NOT mandatory. It is up to you to give it or not.
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People :
Felt by persons at rest, on upper floors or favorably placed.
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People :
Felt indoors; hanging objects may swing, vibration similar to passing of light trucks, duration may be estimated, may not be recognized as an earthquake.
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People :
Generally noticed indoors but not outside. Light sleepers may be awakened. Vibration may be likened to the passing of heavy traffic, or to the jolt of a heavy object falling or striking the building.
Fittings :
Doors and windows rattle. Glassware and crockery rattle. Liquids in open vessels may be slightly disturbed. Standing motorcars may rock.
Structures :
Walls and frames of buildings, and partitions and suspended ceilings in commercial buildings, may be heard to creak.
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People :
Generally felt outside, and by almost everyone indoors. Most sleepers awakened. A few people alarmed.
Fittings :
Small unstable objects are displaced or upset. Some glassware and crockery may be broken. Hanging pictures knock against the wall. Open doors may swing. Cupboard doors secured by magnetic catches may open. Pendulum clocks stop, start, or change rate.
Structures :
Some large display windows cracked. A few earthenware toilet fixtures cracked.
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People Felt by all. People and animals alarmed. Many run outside. Difficulty experienced in walking steadily.
Fittings :
Objects fall from shelves. Pictures fall from walls. Some furniture moved on smooth floors, some unsecured free-standing fireplaces moved. Glassware and crockery broken. Very unstable furniture overturned. Small church and school bells ring. Appliances move on bench or table tops. Filing cabinets or "easy glide" drawers may open (or shut).
Structures :
Slight damage to buildings with low standard. Some stucco or cement plaster falls. Large display windows broken. Damage to a few weak domestic chimneys, some may fall.
Environment :
Trees and bushes shake, or are heard to rustle. Loose material may be dislodged from sloping ground, e.g. existing slides, talus slopes, shingle slides.
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People
General alarm. Difficulty experienced in standing. Noticed by motorcar drivers who may stop.
Fittings :
Large bells ring. Furniture moves on smooth floors, may move on carpeted floors. Substantial damage to fragile contents of buildings.
Structures :
Unreinforced stone and brick walls cracked. Low standard buildings cracked with some minor masonry falls. A few instances of damage to buildings of ordinary workmanship. Unbraced parapets, unbraced brick gables, and architectural ornaments fall. Roofing tiles, especially ridge tiles may be dislodged. Many unreinforced domestic chimneys damaged, often falling from roof-line. Water tanks Type I burst. A few instances of damage to brick veneers and plaster or cement-based linings. Unrestrained water cylinders (hot-water cylinders) may move and leak. Some common windows cracked. Suspended ceilings damaged.
Environment :
Water made turbid by stirred up mud. Small slides such as falls of sand and gravel banks, and small rock-falls from steep slopes and cuttings. Instances of settlement of unconsolidated or wet, or weak soils. Some fine cracks appear in sloping ground. A few instances of liquefaction (i.e. small water and sand ejections).
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People Alarm may approach panic. Steering of motorcars greatly affected. Structures : Low standard buildings heavily damaged, some collapse. ordinary workmanship buildings damaged, some with partial collapse. Reinforced masonry or concrete buildings damaged in some cases. A few instances of damage to buildings and bridges designed and built to resist earthquakes. Monuments and pre-1976 elevated tanks and factory stacks twisted or brought down. Some pre-1965 infill masonry panels damaged. A few post-1980 brick veneers damaged. Decayed timber piles of houses damaged. Houses not secured to foundations may move. Most unreinforced domestic chimneys damaged, some below roof-line, many brought down. Environment : Cracks appear on steep slopes and in wet ground. Small to moderate slides in roadside cuttings and unsupported excavations. Small water and sand ejections and localized lateral spreading adjacent to streams, canals, lakes, etc.
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Structures Many low standard buildings destroyed. Ordinary workmanship buildings heavily damaged, some collapse. Reinforced masonry or concrete buildings damaged, some with partial collapse. Buildings and bridges designed and built to resist earthquakes damaged in some cases, some with flexible frames seriously damaged. Damage or permanent distortion to some buildings and bridges, designed and built to normal use standards. Houses not secured to foundations shifted off. Brick veneers fall and expose frames. Environment : Cracking of ground conspicuous. Landsliding general on steep slopes. Liquefaction effects intensified and more widespread, with large lateral spreading and flow sliding adjacent to streams, canals, lakes, etc.
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