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After a fairly strong jolt yesterday, got woken by a stronger one this morning at 6:30 and had a few more since then, the strongest just 10 minutes ago at 5 chaku.

 

It's all feeling a bit shaky right now.

 

shifty

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Niigata ones M4.5 - M4.7, but what really counts is the movement on the ground, the strongest @ shindo 5 this morning.

 

Earthquakes in Japan since Wednesday.

 

å¹³æˆï¼’2年1ï¼æœˆï¼ï¼“日1ï¼æ™‚ï¼ï¼”分  3日ï¼ï¼™æ™‚59分頃 新潟県上越地方 M2.7 震度1

å¹³æˆï¼’2年1ï¼æœˆï¼ï¼“æ—¥ï¼ï¼™æ™‚31分  3日ï¼ï¼™æ™‚26分頃 新潟県上越地方 M4.7 震度5弱

å¹³æˆï¼’2年1ï¼æœˆï¼ï¼“æ—¥ï¼ï¼˜æ™‚ï¼’ï¼åˆ†  3日ï¼ï¼˜æ™‚15分頃 宮城県北部 ï¼­ï¼“ï¼Žï¼ éœ‡åº¦ï¼‘

å¹³æˆï¼’2年1ï¼æœˆï¼ï¼“æ—¥ï¼ï¼—時ï¼ï¼‘分  3日ï¼ï¼–時57分頃 新潟県上越地方 M3.3 震度3

å¹³æˆï¼’2年1ï¼æœˆï¼ï¼“æ—¥ï¼ï¼–時57分  3日ï¼ï¼–時52分頃 新潟県上越地方 M4.4 震度4

å¹³æˆï¼’2年1ï¼æœˆï¼ï¼“æ—¥ï¼ï¼–時42分  3日ï¼ï¼–時37分頃 新潟県上越地方 M4.5 震度4

å¹³æˆï¼’2年1ï¼æœˆï¼ï¼’日19時32分  2日19時26分頃 ç¦å³¶çœŒä¸­é€šã‚Š M2.4 震度1

å¹³æˆï¼’2年1ï¼æœˆï¼ï¼’日18時15分  2日18時11分頃 奄美大島北æ±æ²– M3.7 震度1

å¹³æˆï¼’2年1ï¼æœˆï¼ï¼’日16時36分  2日16時31分頃 ç¦å³¶çœŒä¸­é€šã‚Š M2.9 震度1

å¹³æˆï¼’2年1ï¼æœˆï¼ï¼’日16時22分  2日16時17分頃 北海é“æ±æ–¹æ²– M4.7 震度1

å¹³æˆï¼’2年1ï¼æœˆï¼ï¼’日12時4ï¼åˆ†  2日12時35分頃 新潟県上越地方 M4.3 震度4

å¹³æˆï¼’2年1ï¼æœˆï¼ï¼’æ—¥ï¼ï¼—時34分  2日ï¼ï¼—時3ï¼åˆ†é ƒ 滋賀県å—部 ï¼­ï¼“ï¼Žï¼ éœ‡åº¦ï¼‘

å¹³æˆï¼’2年1ï¼æœˆï¼ï¼‘日21時54分  1日21時5ï¼åˆ†é ƒ ç¦å³¶çœŒä¸­é€šã‚Š M2.4 震度1

å¹³æˆï¼’2年1ï¼æœˆï¼ï¼‘日2ï¼æ™‚33分  1日2ï¼æ™‚28分頃 秋田県内陸å—部 M3.8 震度2

å¹³æˆï¼’2年1ï¼æœˆï¼ï¼‘日19時33分  1日19時29分頃 ç¦å³¶çœŒä¸­é€šã‚Š M2.5 震度1

å¹³æˆï¼’2年1ï¼æœˆï¼ï¼‘日19時3ï¼åˆ†  1日19時26分頃 ç¦å³¶çœŒä¸­é€šã‚Š M2.6 震度1

å¹³æˆï¼’2年1ï¼æœˆï¼ï¼‘日19時ï¼ï¼˜åˆ†  1日19時ï¼ï¼“分頃 ç¦å³¶çœŒä¸­é€šã‚Š M2.7 震度1

å¹³æˆï¼’2年1ï¼æœˆï¼ï¼‘日18時57分  1日18時52分頃 ç¦å³¶çœŒä¸­é€šã‚Š M4.2 震度2

å¹³æˆï¼’2年1ï¼æœˆï¼ï¼‘日15時25分  1日15時2ï¼åˆ†é ƒ ç¦å³¶çœŒä¸­é€šã‚Š M2.9 震度1

å¹³æˆï¼’2年1ï¼æœˆï¼ï¼‘日12時29分  1日12時24分頃 日高地方æ±éƒ¨ M3.6 震度1

å¹³æˆï¼’2年1ï¼æœˆï¼ï¼‘日11時1ï¼åˆ†  1日11時ï¼ï¼•åˆ†é ƒ ç¦å³¶çœŒä¸­é€šã‚Š M2.3 震度1

å¹³æˆï¼’2年1ï¼æœˆï¼ï¼‘日1ï¼æ™‚44分  1日1ï¼æ™‚38分頃 ç¦å³¶çœŒä¸­é€šã‚Š M2.3 震度1

å¹³æˆï¼’2年1ï¼æœˆï¼ï¼‘æ—¥ï¼ï¼˜æ™‚35分  1日ï¼ï¼˜æ™‚3ï¼åˆ†é ƒ ç¦å³¶çœŒä¸­é€šã‚Š ï¼­ï¼“ï¼Žï¼ éœ‡åº¦ï¼‘

å¹³æˆï¼’2年1ï¼æœˆï¼ï¼‘æ—¥ï¼ï¼˜æ™‚28分  1日ï¼ï¼˜æ™‚24分頃 ç¦å³¶çœŒä¸­é€šã‚Š M4.3 震度3

å¹³æˆï¼’2年1ï¼æœˆï¼ï¼‘æ—¥ï¼ï¼–時48分  1日ï¼ï¼–時43分頃 ç¦å³¶çœŒä¸­é€šã‚Š M2.8 震度1

å¹³æˆï¼’2年1ï¼æœˆï¼ï¼‘æ—¥ï¼ï¼•æ™‚35分  1日ï¼ï¼•æ™‚3ï¼åˆ†é ƒ ç¦å³¶çœŒä¸­é€šã‚Š M2.7 震度1

å¹³æˆï¼’2年1ï¼æœˆï¼ï¼‘æ—¥ï¼ï¼“時26分  1日ï¼ï¼“時21分頃 ç¦å³¶çœŒä¸­é€šã‚Š M2.5 震度1

å¹³æˆï¼’2年1ï¼æœˆï¼ï¼‘æ—¥ï¼ï¼“時25分  1日ï¼ï¼“時2ï¼åˆ†é ƒ ç¦å³¶çœŒä¸­é€šã‚Š M2.8 震度1

å¹³æˆï¼’2年1ï¼æœˆï¼ï¼‘æ—¥ï¼ï¼“時15分  1日ï¼ï¼“時1ï¼åˆ†é ƒ 大阪府å—部 M2.9 震度1

å¹³æˆï¼’ï¼’å¹´ï¼ï¼™æœˆï¼“ï¼æ—¥ï¼’2時ï¼ï¼åˆ† 3ï¼æ—¥ï¼’1時47分頃 ç¦å³¶çœŒæ²– M4.7 震度3

å¹³æˆï¼’ï¼’å¹´ï¼ï¼™æœˆï¼“ï¼æ—¥ï¼’1時52分 3ï¼æ—¥ï¼’1時47分頃 ç¦å³¶çœŒæ²– M4.7 震度3

å¹³æˆï¼’ï¼’å¹´ï¼ï¼™æœˆï¼“ï¼æ—¥ï¼’ï¼æ™‚ï¼ï¼™åˆ† 3ï¼æ—¥ï¼’ï¼æ™‚ï¼ï¼•åˆ†é ƒ ç¦å³¶çœŒä¸­é€šã‚Š M3.8 震度3

å¹³æˆï¼’ï¼’å¹´ï¼ï¼™æœˆï¼“ï¼æ—¥ï¼‘9時49分 3ï¼æ—¥ï¼‘9時44分頃 å®®å¤å³¶è¿‘æµ· M3.7 震度1

å¹³æˆï¼’ï¼’å¹´ï¼ï¼™æœˆï¼“ï¼æ—¥ï¼‘4時29分 3ï¼æ—¥ï¼‘4時24分頃 è‹«å°ç‰§æ²– M3.3 震度1

å¹³æˆï¼’ï¼’å¹´ï¼ï¼™æœˆï¼“ï¼æ—¥ï¼‘4時12分 3ï¼æ—¥ï¼‘4時ï¼ï¼˜åˆ†é ƒ 岡山県å—部 ï¼­ï¼“ï¼Žï¼ éœ‡åº¦ï¼’

å¹³æˆï¼’ï¼’å¹´ï¼ï¼™æœˆï¼“ï¼æ—¥ï¼‘3時4ï¼åˆ† 3ï¼æ—¥ï¼‘3時35分頃 和歌山県北部 M2.8 震度2

å¹³æˆï¼’ï¼’å¹´ï¼ï¼™æœˆï¼“ï¼æ—¥ï¼‘2時39分 3ï¼æ—¥ï¼‘2時34分頃 トカラ列島近海 M1.8 震度1

å¹³æˆï¼’ï¼’å¹´ï¼ï¼™æœˆï¼“ï¼æ—¥ï¼‘ï¼æ™‚22分 3ï¼æ—¥ï¼‘ï¼æ™‚18分頃 ç¦å³¶çœŒä¸­é€šã‚Š M3.1 震度1

å¹³æˆï¼’ï¼’å¹´ï¼ï¼™æœˆï¼“ï¼æ—¥ï¼ï¼™æ™‚31分 3ï¼æ—¥ï¼ï¼™æ™‚24分頃 硫黄島近海 M5.5 震度1

å¹³æˆï¼’ï¼’å¹´ï¼ï¼™æœˆï¼“ï¼æ—¥ï¼ï¼—時48分 3ï¼æ—¥ï¼ï¼—時43分頃 ç¦å³¶çœŒä¸­é€šã‚Š M2.6 震度1

å¹³æˆï¼’ï¼’å¹´ï¼ï¼™æœˆï¼“ï¼æ—¥ï¼ï¼–時58分 3ï¼æ—¥ï¼ï¼–時53分頃 ç¦å³¶çœŒä¸­é€šã‚Š M3.3 震度1

å¹³æˆï¼’ï¼’å¹´ï¼ï¼™æœˆï¼“ï¼æ—¥ï¼ï¼“時44分 3ï¼æ—¥ï¼ï¼“時39分頃 ç¦å³¶çœŒä¸­é€šã‚Š ï¼­ï¼“ï¼Žï¼ éœ‡åº¦ï¼‘

å¹³æˆï¼’ï¼’å¹´ï¼ï¼™æœˆï¼“ï¼æ—¥ï¼ï¼’時23分 3ï¼æ—¥ï¼ï¼’時18分頃 ç¦å³¶çœŒä¸­é€šã‚Š M2.8 震度1

å¹³æˆï¼’ï¼’å¹´ï¼ï¼™æœˆï¼“ï¼æ—¥ï¼ï¼‘時27分 3ï¼æ—¥ï¼ï¼‘時23分頃 ç¦å³¶çœŒä¸­é€šã‚Š M4.5 震度3

å¹³æˆï¼’ï¼’å¹´ï¼ï¼™æœˆï¼“ï¼æ—¥ï¼ï¼æ™‚48分 3ï¼æ—¥ï¼ï¼æ™‚43分頃 ç¦å³¶çœŒä¸­é€šã‚Š ï¼­ï¼“ï¼Žï¼ éœ‡åº¦ï¼‘

å¹³æˆï¼’ï¼’å¹´ï¼ï¼™æœˆï¼’9日23時51分 29日23時46分頃 ç¦å³¶çœŒä¸­é€šã‚Š M2.7 震度1

å¹³æˆï¼’ï¼’å¹´ï¼ï¼™æœˆï¼’9日22時55分 29日22時48分頃 ç¦å³¶çœŒä¸­é€šã‚Š M2.4 震度1

å¹³æˆï¼’ï¼’å¹´ï¼ï¼™æœˆï¼’9日2ï¼æ™‚32分 29日2ï¼æ™‚27分頃 ç¦å³¶çœŒä¸­é€šã‚Š M2.7 震度1

å¹³æˆï¼’ï¼’å¹´ï¼ï¼™æœˆï¼’9日19時45分 29日19時4ï¼åˆ†é ƒ ç¦å³¶çœŒä¸­é€šã‚Š M2.7 震度1

å¹³æˆï¼’ï¼’å¹´ï¼ï¼™æœˆï¼’9日19時35分 29日19時3ï¼åˆ†é ƒ ç¦å³¶çœŒä¸­é€šã‚Š M2.7 震度1

å¹³æˆï¼’ï¼’å¹´ï¼ï¼™æœˆï¼’9日19時22分 29日19時18分頃 ç¦å³¶çœŒä¸­é€šã‚Š M2.9 震度1

å¹³æˆï¼’ï¼’å¹´ï¼ï¼™æœˆï¼’9日19時22分 29日19時16分頃 ç¦å³¶çœŒä¸­é€šã‚Š M2.7 震度1

å¹³æˆï¼’ï¼’å¹´ï¼ï¼™æœˆï¼’9日19時17分 29日19時12分頃 ç¦å³¶çœŒä¸­é€šã‚Š M2.3 震度1

å¹³æˆï¼’ï¼’å¹´ï¼ï¼™æœˆï¼’9日19時ï¼ï¼™åˆ† 29日19時ï¼ï¼”分頃 ç¦å³¶çœŒä¸­é€šã‚Š M3.1 震度1

å¹³æˆï¼’ï¼’å¹´ï¼ï¼™æœˆï¼’9日18時49分 29日18時44分頃 ç¦å³¶çœŒä¸­é€šã‚Š ï¼­ï¼“ï¼Žï¼ éœ‡åº¦ï¼‘

å¹³æˆï¼’ï¼’å¹´ï¼ï¼™æœˆï¼’9日18時27分 29日18時22分頃 ç¦å³¶çœŒä¸­é€šã‚Š M3.3 震度1

å¹³æˆï¼’ï¼’å¹´ï¼ï¼™æœˆï¼’9日17時56分 29日17時51分頃 ç¦å³¶çœŒä¸­é€šã‚Š M3.7 震度2

å¹³æˆï¼’ï¼’å¹´ï¼ï¼™æœˆï¼’9日17時52分 29日17時47分頃 ç¦å³¶çœŒä¸­é€šã‚Š M2.3 震度1

å¹³æˆï¼’ï¼’å¹´ï¼ï¼™æœˆï¼’9日17時42分 29日17時37分頃 ç¦å³¶çœŒä¸­é€šã‚Š M2.8 震度1

å¹³æˆï¼’ï¼’å¹´ï¼ï¼™æœˆï¼’9日17時3ï¼åˆ† 29日17時25分頃 ç¦å³¶çœŒä¸­é€šã‚Š M3.2 震度2

å¹³æˆï¼’ï¼’å¹´ï¼ï¼™æœˆï¼’9日17時21分 29日17時16分頃 ç¦å³¶çœŒä¸­é€šã‚Š M3.2 震度1

å¹³æˆï¼’ï¼’å¹´ï¼ï¼™æœˆï¼’9日17時18分 29日17時12分頃 ç¦å³¶çœŒä¸­é€šã‚Š M3.3 震度1

å¹³æˆï¼’ï¼’å¹´ï¼ï¼™æœˆï¼’9日17時15分 29日17時ï¼ï¼™åˆ†é ƒ ç¦å³¶çœŒä¸­é€šã‚Š M3.3 震度2

å¹³æˆï¼’ï¼’å¹´ï¼ï¼™æœˆï¼’9日17時12分 29日17時ï¼ï¼–分頃 ç¦å³¶çœŒä¸­é€šã‚Š M3.7 震度2

å¹³æˆï¼’ï¼’å¹´ï¼ï¼™æœˆï¼’9日17時1ï¼åˆ† 29日17時ï¼ï¼åˆ†é ƒ ç¦å³¶çœŒä¸­é€šã‚Š M5.8 震度4

å¹³æˆï¼’ï¼’å¹´ï¼ï¼™æœˆï¼’9日17時ï¼ï¼”分 29日17時ï¼ï¼åˆ†é ƒ ç¦å³¶çœŒä¸­é€šã‚Š M5.8 震度4

å¹³æˆï¼’ï¼’å¹´ï¼ï¼™æœˆï¼’9日12時ï¼ï¼–分 29日12時ï¼ï¼’分頃 ç¦å³¶çœŒä¸­é€šã‚Š M4.9 震度3

å¹³æˆï¼’ï¼’å¹´ï¼ï¼™æœˆï¼’9日ï¼ï¼“時46分 29日ï¼ï¼“時35分頃 岩手県沿岸北部  M4.1 震度3

å¹³æˆï¼’ï¼’å¹´ï¼ï¼™æœˆï¼’9日ï¼ï¼“時4ï¼åˆ† 29日ï¼ï¼“時35分頃 岩手県沿岸北部  M4.1 震度3

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Depends on how far down it is doesn't it?

If it's 100km under the earth it will be very different than if it is just 10km.

 

That's why the most important and useful number is the "shindo" number that they get in Japan. It's basically a number that shows how powerful the shaking was on ground in different areas of town.

 

Here's what this mornings looked like

 

20101003093126391-030926.png

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Is the shindo number an idea of what magnitude it feels like, rather than the magnitude it was?

 

All of ours recently have been really shallow - the first one was about 20km, and you could hear the roar of the quake traveling through the shingle on it's way towards you. Yuck.

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Nope, shindo is based on the visible reactions from the initial earthquake and ground acceleration of various levels, while magnitude is based on a logarithmic scale of power i.e. mg2 is 10x more powerful than mg1, like a mg3 is 100x more powerful than mg1 etc.

 

So you can have a shallow earthquake, say 10kms, with mag 4, that produces shindo 5. Different results and outcomes on each scale. If your gas doesn't work after an earthquake, you know it was serious as most gas devices in Japan shut off on 5 or above.

 

Likewise, you could have a shindo 3, that was magnitude 7 but if it was deep, and the waves dissipated quick enought, it wouldn't cause much surface shaking.

 

Well that's what I was told from one of my 2nd university students who studies seismology.

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I have a cool Kawaguchi t-shirt, can't remember exactly what it says but something along the lines of Shindo 7 center of the quake (in Japanese). Kawaguchi is famous for being the only place to get a shindo 7 reading, if I remember correctly, for the Chuetsu 5 years ago

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Head a rumour once, that if the Tokaido Express Shinakansen was running a full speed, and the big one happened the kanto area, the shinkansen would be thrown off it's tracks.

 

Dunno if it's true or not...

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Originally Posted By: RobBright
Nope, shindo is based on the visible reactions from the initial earthquake and ground acceleration of various levels,


From Wikipedia:

Quote:
The Japan Meteorological Agency seismic intensity scale is a measure used in Japan and Taiwan to indicate the strength of earthquakes. It is measured in units of shindo (震度?, seismic intensity, lit. "degree of shaking". Unlike the Richter magnitude scale (which measures the total magnitude of the earthquake, and represents the size of the earthquake with a single number) the JMA scale describes the degree of shaking at a point on the Earth's surface
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Originally Posted By: Tubby Beaver
Originally Posted By: RobBright
Nope, shindo is based on the visible reactions from the initial earthquake and ground acceleration of various levels,


From Wikipedia:

Quote:
The Japan Meteorological Agency seismic intensity scale is a measure used in Japan and Taiwan to indicate the strength of earthquakes. It is measured in units of shindo (震度?, seismic intensity, lit. "degree of shaking". Unlike the Richter magnitude scale (which measures the total magnitude of the earthquake, and represents the size of the earthquake with a single number) the JMA scale describes the degree of shaking at a point on the Earth's surface


So my student quoted wikipedia? wakaranai
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