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Old 02-18-2012, 09:24 AM
 
3,426 posts, read 2,879,644 times
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Timeline Vizualization Map of the Japan Earthquakes in 2011. Watch the video in its entirety. The graphical presentation of the ongoing seismic activity related to the March 11, 2011 Japan megathrust earthquake is simply jaw dropping. Note the foreshock that occurs about a day or two before the main temblor and the thousands of aftershocks that are going on even today. The entire megathrust segment ruptured down to a depth of 50 km:


PLANETARY TREMORS: Timeline Vizualization Map of the Japan Earthquakes in 2011! - YouTube
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Old 02-18-2012, 09:41 AM
 
Location: South Park, San Diego
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That's wild! Nice little consistent activity, then, WHAM! Things are all stirred up after that- great analysis tool.
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Old 02-18-2012, 09:56 AM
 
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Quote:
Originally Posted by T. Damon View Post
That's wild! Nice little consistent activity, then, WHAM! Things are all stirred up after that- great analysis tool.
I'm a geologist, and I've never seen seismic data presented in quite this way. It is very drammatic and informative. Did you notice the large foreshock before the big whammy (that's a scientific term, don'tcha know - lol)? It is probable that the large foreshock was not only a precursor but loaded the megathrust for the main rupture event. It is one of the most drammatic seismic events any geologist alive has likely ever witnessed, and really hits home how complete the rupture was. It let go from the surface all the way down to 50 km, and over the nearly the entire length and width of this segment of the megathrust zone. That's unimaginable.
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Old 02-18-2012, 01:06 PM
 
Location: South Park, San Diego
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I noted your original comments and was looking closely at the timeline to check out if I could notice the foreshocks and it was very obvious from this layperson. I would really like to be able to see this in a bigger screen, with more information (in English obviously) and with the ability to edit the speed to really take note in what's happening. Still, the graphic presentation icons with the size and depth indicators, coupled with the sound effects relating to the size and depth of the activity made it extremely compelling to watch.

I would imagine to a Geologist this is about as good as it gets for earthquake studies- hopefully some predictive behavior can be discerned from the analysis of this for those of us who live in earthquake country.
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