6,757 aftershocks felt in Japan from March 11 until Dec 31

TOKYO —

The Meteorological Agency said Thursday that 6,757 aftershocks were felt in Japan after the March 11 disaster through Dec 31.

Of those, there were 14 with a magnitude over 5, 30 with a magnitude of 5, 174 with a magnitude of 4, 707 (magnitude 3), 1,904 (magnitude 2) and 3,928 (magnitude 1), the agency said on its website.

For the whole year, the agency said there were 9,723 earthquakes and aftershocks, seven times the number in 2010.

An agency official said that although the number of aftershocks has been decreasing, it will be many years before seismic activity returns to pre-March 11 levels.

Japan Today

  • 1

    Samantha Zoe Aso

    Yep! What a year for rocking and rolling. Hoping this year is calmer for all.

  • 3

    Badge213

    When does an aftershock stoping being an aftershock and an Earthquake of it's own?

  • 2

    zichi

    Must be some sort of record. It will take decades to decrease.

  • 0

    daisan

    to get an idea check this site, doesn't seem to show the 1s and 2s though

    http://www.japanquakemap.com/

  • 1

    Blair Herron

    @daisan, thanks for the link. The time starts March 11, 1:00 a.m. The major one is at 14:46 (=2:46 p.m.) It shows some foreshocks, too.

  • 1

    Farmboy

    http://www.jma.go.jp/en/quake/quake_local_index.html

    Fukushima and Ibaraki in particular have been having non-stop quakes, with quite a few 4-5 magnitude quakes recently. The shindo rating isn't so high, but many have been felt over a wide area, like the last one, in Ibaraki.

  • 1

    MaboDofuIsSpicy

    There was another 5 this morning at 5:55 am. My phone was making a racket on the train.

  • 0

    Samantha Zoe Aso

    @MaboDofulsSpicy. Wow! I thought I was out and about early this morning!

    After New Year's Day, I am all edgy again! Just keep telling myself that all these shakes are a good thing because hopefully, it's pressure being released! Not that I know what I am talking about....

  • 1

    paulinusa

    I would have put the under/over at 10,000.

  • -3

    Elbuda Mexicano

    Geez! Not like anybody is really counting all of these after shocks, right??

  • -3

    Elbuda Mexicano

    Thank god I was born in Mexico plenty of quakes Went to university in California some more quakes now living here on the J islands so none of this phases me one bit just s bit of sea Sickness?? Land lover that I am. As long as Fukushima does not implode then explode I'm cool!!

  • 1

    MaboDofuIsSpicy

    I was late Samantha Zoe. I usually get up at 4:20 to catch a 5:12 train to get to work.

    That phone app for the iPhone is good. But it jammed up the other day during that 6.8M

  • 2

    Darren Brannan

    That's insane. My hometown in Aus had Australia's biggest quake, then another, so nowhere is 'safe' as such. I read that even England has become seismic because of Aussie companies 'fracking' for gas there.. But still I look forward to being away from the worry of a big tremblor. Can't imagine what a frantic year people have had in the north. I hope the Japanese isles get some respite this yr.

  • 2

    Ken Watanabe

    Boy, that's a lot. Plus one they had on the New Year's Day.

  • 0

    Samantha Zoe Aso

    MaboDofulsSpicy. Yeah! Mine did too! Normally gives me quite a few seconds to react. Nothing this time.

    To a quieter year on the shaky front.

  • 0

    Foxie

    I usually really like statistics but not this one. In other words, there have been 26.6 earthquakes per day on average, that is 1 every hour.

  • 0

    serendipitous

    "Magnitude" refers to the open-ended Richter Scale not the "Japanese Intensity Scale" (which goes up to a maximum of 7), right?

  • 0

    Jannetto

    @Badge213 - darn, someone just told me this today, I wasn't paying attention... it was a Kiwi talking about their quakes and shocks- she may have said it takes about a year for shocks to not be shocks but to be proper quakes- but that seems a bit random...

  • 0

    Blair Herron

    "Japanese Intensity Scale" (which goes up to a maximum of 7), right?

    Yes. Shindo has 10 levels, from 0 to 7.

    0, 1, 2, 3, 4, 5weak, 5strong, 6weak, 6strong, and 7.

    http://en.wikipedia.org/wiki/Japan_Meteorological_Agency_seismic_intensity_scale

    Kurihara-shi, Miyagi was the only city to report the maximum value of shindo 7, on March 11. The city was not damaged by tsunami. There are no casualties, 6 severe injury, 544 minor injury (population of 75,916 people).

    http://www.kuriharacity.jp/kuriharacity/contents/emergency/saigai/110311_jisin.html

  • 2

    MasterBape

    The aftershocks are normal and the number is high due to the size of the March quake as the fault line steadies itself after rupturing. Still, after all that happened on that day it really made people aware of how much damage and how scary a big quake can be after experiencing it firsthand. All the aftershocks really made people edgy.

  • 0

    Ranger_Miffy2

    I know I remain "edgy" when things still keep launching themselves into space during a shaker...

  • 0

    Serrano

    6,757, eh? I felt only around 1,000 of them.

  • 0

    Arthur Dumbolov

    Few Earthquakes in Russia, most powerful was 9.5 in Sakha, people was evacuated for all night, no buildings were crashed. They were not built for regions with earthquakes, but they standed.

  • 0

    Blair Herron

    I was at an evacuation center terrified with all those constant aftershocks. An only lady next to me said, "After a big earthquake like this, we're gonna have to have about 100 aftershocks. After that, things will be calm." She was quite wrong. Sometime in the future when we have this mega earthquake again, I'm gonna have to tell people, "After a big earthquake like this, we're gonna have to have more than 6,000 aftershocks. After that, things still will be unstable..."

  • 0

    miyazawa3

    Yes we know that ..

    The people of the beginning new clearly that the earth is shaking and the reason for that. but now, most of us do not know the reason...because we believe the science and the technology too far, to come out with reports, tested in the laboratorys.,

    rather than divinity ,

  • 0

    Son_of_Laertes

    They were not all felt. They were detected by machines.

    Of those that were felt, most had people wondering if someone bumped their desk or if there was a sudden gust of wind against their building.

  • 0

    xrc

    Yes, I've been feeling the ground moving every day & night since Jan. 1st. Am I a dog? I've become very sensitive....even today I asked my wife while we were sitting under the kotasu table if she felt movement.
    Actually, the ground is always moving but as most said, we don't normally feel it. I know the bumps of the street if the cars or trucks pass by or the wind (since I live in a old house)...but it is/was the ground beneath moving. I did manage to capture the March 11th on video cam here as it happened. And on a few other occasions as well. Had my camera on the kotatsu on Jan. 1st but was charging my battery. Still had time to go into the kitchen and run upstairs and film the monitors swaying back and forth...

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