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Originally posted by katfish
reply to post by CLPrime
I feel absolutely hideous today with a very rare large headache, left side of my face hurting, ears full, feeling stupid. I have done nothing in the past 3-5 days to bring this on. This whole past week I have felt "off".
Noticing that the outside door is "off' by a bit, a window seal has popped, and there are cracks along the seams of drywall in our new addition.
Hens not laying and hunkering down.
Originally posted by justsaying
I didn't feel anything here in Memphis either. But I have to say it's pretty annoying that the USGS isn't reporting these small quakes that continue to occur.
Originally posted by pls8xx
Earthquakes relieve the strain that exists in rock strata. Each quake dissipates the kinetic energy that was stored in the rock. This morning my mind is on the total seismic energy being released on a week to week basis in Arkansas. Is it varying each week or remaining more or less the same? Is it increasing or decreasing?
On any given week a lot of small unreported quakes might add up to what a fewer larger quakes would look like on another week. So how would one go about assessing what the total energy dissipation has been? I think we would have a better idea of what is happening if we knew the answer to these questions.
If there is a lot of variation in each week, that would seem to be a random release of energy that built up over a long period. On the other hand, a steady release might indicate a more immediate result of constantly developing strain.
Q: Can you prevent large earthquakes by making lots of small ones, or by "lubricating" the fault with water or another material?
A: Seismologists have observed that for every magnitude 6 earthquake there are 10 of magnitude 5, 100 of magnitude 4, 1,000 of magnitude 3, and so forth as the events get smaller and smaller. This sounds like a lot of small earthquakes, but there are never enough small ones to eliminate the occasional large event. It would take 32 magnitude 5's, 1000 magnitude 4's, 32,000 magnitude 3's to equal the energy of one magnitude 6 event. So, even though we always record many more small events than large ones, there are never enough to eliminate the need for the occasional large earthquake.
As for "lubricating" faults with water or some other substance, injecting high pressure fluids deep into the ground is known to be able to trigger earthquakes to occur sooner than would have been the case without the injection. However this would be a dangerous pursuit in any populated area, as one might trigger a damaging earthquake.