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originally posted by: TheJesuit
I already know whats coming it isnt pretty were heading in to what history will call dark age period again.
originally posted by: TrueAmerican
Here is the last thirty days activity (above 4.5), including that 6.3 that just happened:
I drew a red circle where things seem to be converging. I'd say that spot is at high risk for a quake right about now or in the near future.
Although the stress was largely released during the 2011 rupture, thus leading to an increase in b-values immediately after the megathrust event, the stress levels (i.e., b-values) quickly recovered to pre-megaquake levels within just a few years. This suggests that the megathrust zone is likely ready for large earthquakes any time with a low but on average constant probability.
Read more at: phys.org...
The results show that mega-thrust earthquakes make the Earth expand and earthquakes along a normal fault make the Earth contract. We compare the volume changes computed for finite fault models and a point source of the 2011 Tohoku-Oki earthquake (Mw9.0). The big difference of the results indicates that the coseismic changes in the Earth's volume (or the mean radius) are strongly dependent on the earthquakes’ focal mechanism, especially the depth and the dip angle. Then we estimate the cumulative volume changes by historical earthquakes (Mw ≥ 7.0) since 1960, and obtain an Earth mean radius expanding rate about 0.011 mm yr−1.
Earthquakes are not isolated events, they occur in sequences. Most often, each sequence is dominated by an event with a larger magnitude than all others in the sequence (usually about one magnitude unit larger).
We call the large event the mainshock, and the events that follow are called aftershocks.
Occasionally, the mainshock is preceded by an event or events that we call a foreshock(s).
Sometimes, earthquakes occur in interesting sequences which we call doublets, triplets, multiplets, or swarms depending on how many similar-size events are in the sequence.