Powerful quake just it Japan.

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doctorjj

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Just to put it in perspective... I am about 60 miles from Sparks (rough epicenter of the 5.6), I just had some shaking and dishes rattling. No damage. A 6.0-6.9 will be destructive out to 99miles.

Not sure if dennis said it in this thread or another, Richter is based off of Log base 10 and the power release represented by richter is exponetial not linear. for instance, a 5.0 is ~31 times more powerful than a 4.0, and a 6.0 is ~63 times more powerful than a 5.0.

Yes, thank you. I already am aware of that. While there is no set definition of a large or major earthquake, the most widely accepted definition would be anything 7.0 or greater will be defined as a major earthquake. So again, I, personally, wouldn't call a 6.8 quake "huge", but maybe that's just me.
 

WhiteyMacD

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Yes, thank you. I already am aware of that.
Good for you.

While there is no set definition of a large or major earthquake, the most widely accepted definition would be anything 7.0 or greater will be defined as a major earthquake. So again, I, personally, wouldn't call a 6.8 quake "huge", but maybe that's just me.
Relativity, my friend. Now Im not some super experienced person that travels from place to place to experience quakes, so the 5.6 I felt Saturday as my control... 6.something is gonna be huge.
 
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A 6.8. That's not huge.

What??? Have you ever been in a 6.8?? I have and it was many, many times worse then the one we had Saturday. In a heavily populated area a 6.8 could be devastating.

I was in SeaTac airport when the Nisqually quake hit on 2-28-2001. It made our little one on Saturday evening seem little a small fart after eating a bean burrito from Taco Time....

http://www.ce.washington.edu/~nisqually/index.html
 

dru

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sorry, the little mathematical/anal part of my brain feels the need to clarify a few things about earthquake strength. They are based on base 10 logs, but the richter numbers correspond to the amplitude of the earthquake "waves" So a 5.0 has an amplitude of 10x that of a 4.0 However, because of the way that amplitudes correspond to energy contained, a 5.0 will possess about 31.6x more energy than a 4.0

Also, and this is an interesting tidbit I picked up from wikipedia, but if you look at the richter numbers of earthquakes, and their relative frequency, there appears to be a log10 relationship in earthquake occurence. i.e. an earthquake of 4.x occurs about 10 times as often as an earthquake of 5.x

Okay, everyone please continue on
 

WhiteyMacD

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Just to put it in perspective... I am about 60 miles from Sparks (rough epicenter of the 5.6), I just had some shaking and dishes rattling. No damage. A 6.0-6.9 will be destructive out to 99miles.

Not sure if dennis said it in this thread or another, Richter is based off of Log base 10 and the power release represented by richter is exponetial not linear. for instance, a 5.0 is ~31 times more powerful than a 4.0, and a 6.0 is ~63 times more powerful than a 5.0.

sorry, the little mathematical/anal part of my brain feels the need to clarify a few things about earthquake strength. They are based on base 10 logs, but the richter numbers correspond to the amplitude of the earthquake "waves" So a 5.0 has an amplitude of 10x that of a 4.0 However, because of the way that amplitudes correspond to energy contained, a 5.0 will possess about 31.6x more energy than a 4.0

Also, and this is an interesting tidbit I picked up from wikipedia, but if you look at the richter numbers of earthquakes, and their relative frequency, there appears to be a log10 relationship in earthquake occurence. i.e. an earthquake of 4.x occurs about 10 times as often as an earthquake of 5.x

Okay, everyone please continue on

Go back to bed, dru.
 

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