Seismologists on Sunday warned Japan to stay vigilant for the next "Big One" after a powerful 7.8-magnitude earthquake struck off the coast of the
quake-prone nation, injuring a dozen people...
Some experts warn recent quakes and volcano eruptions may be signs that areas near the country are entering an active phase of crustal changes.
"I can say Japan is in an active stage now," said Toshiyasu Nagao, head of Earthquake Prediction Research Centre at Tokai University.
"Considering the geographic location of Japan, we can say the current activities are rather normal and it was too quiet" before the 2011 jolt, Mr
Nagao told AFP news agency.
"We should be vigilant by knowing that it is no wonder that an earthquake sizeable enough to affect our society can occur anytime in the future," he
Hmm, this sound familiar? For anyone following our recent thread
on this quake,
JustMike and I were exploring that very possibility. Well now it looks like we aren't the only ones concerned about these quakes. But in our story, we
gave you pretty pictures and more analysis.
So now after more digging, I am going to add some new information. It turns out I pulled a slab depth profile of the 7.8. We do this to get a view of
other quakes that have happened near there to see if the new quake roughly matches the other depths of nearby previous quakes. Now initially, I stated
in that thread that from my memory, I didn't think that quake's depth looked right, or "at a typical depth" for its location. But then upon a cursory
glance at the slab profile, it seemed more like it was at roughly the right depth.
But now I have come across some previous info, which may prove my initial reaction correct. Or more correct than my second reaction. The point is,
that after analyzing the depths of previous quakes in that immediate spot, I am going back to my original reaction. This quake I am going to claim IS
anomalous, and does not fit the depth profile. The closest quake anywhere near that spot with a very deep hypocenter was about 400 km deep. All the
others in that immediate area were much more shallow (30- 200km deep) and conformed much better to the slab profile. This depth of some 677 km deep
for the 7.8 is indeed way too deep for its spot.
So now what exactly does that mean? Well, it could mean that they got the depth wrong on it. So watch for any change in depth on that quake, cause it
already came down from its original 690+ km depth to 677 km. Or it means that the quake originated from somewhere that isn't even supposed to be there
at that location, further adding confusion and making a mockery of these slab depth profiles. Now I saw this days ago. But I'd be willing to bet this
little anomaly might have something to do with why seismologists are now warning Japan to be on the lookout. Because that quake is out of place. They
probably checked and rechecked those arrival times and wave reflections, to verify the hypocenter (and epicenter) locations, and came up scratching
Remember how no one thought a 9.0 could ever EVER hit the spot that it did, primarily because they didn't have evidence of enough fault length to
support a 9.0. They thought a 7.5 would be tops in that spot.
So now they are getting another lesson in "Don't try and define that which you cannot." But I busted em trying to cover it up I think. Notice no
mention of this in the article. Ha.
Leave it up to ATS. We'll sort it out one way or the other. Now I could be wrong... But take a look for yourselves at previous quakes near that 7.8
and tell me what you see...
edit on Mon Jun 1st 2015 by TrueAmerican because: (no reason given)