Gravitational pull 'has role in quakes'
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Re: Gravitational pull 'has role in quakes'
#2Without gravity, there would not be very many earthquakes.
Re: Gravitational pull 'has role in quakes'
#3I looked up the San Francisco 1989 earthquake and it was 2 days past a full moon. I tried to look up tide data, which is out there, but I'm on my phone and didn't want to bother with ftp or CSV stuff, heh. Probably just a coincidence but was interesting to me at least.
Re: Gravitational pull 'has role in quakes'
#4Without gravity, there would not be very many earthquakes.
Or planets lol.
Re: Gravitational pull 'has role in quakes'
#5For those reading the article (it was free to read for me at home), it looks like their central point is shown in Figure 2a. Mind the vertical axis as you look across Figure 2.
The statistics are thankfully low for strong earthquakes, but another century or so will provide an ample test of their hypothesis.
Re: Gravitational pull 'has role in quakes'
#6Queue the fracking-causes-quakes deniers! I can hear the floor speeches already.
Re: Gravitational pull 'has role in quakes'
#7Quote: "When the tug of gravity is strongest, they added, "the probability of a tiny rock failure expanding to a gigantic rupture increases"."
The article's author clearly didn't understand the original paper. It's not gravitational force that was being examined, but its first derivative -- changes in gravitational force from one location to another and/or one time to another, i.e. tidal stresses.
In fact, any change in gravitational force -- either an increase or a decrease -- could produce the effects being examined. So it's not the strength of the gravitational force, but the fact that it changes over time, and from one location to another.
Consider Jupiter's moon Io as a classic example. If Io were in a circular orbit, it would be a cold, dead world. But Io's orbit is elliptical, which causes perpetual changes in tidal force (the first derivative of gravitational force) across Io's diameter. The result is a very highly seismically and volcanically active body.
Re: Gravitational pull 'has role in quakes'
#8I looked up the San Francisco 1989 earthquake and it was 2 days past a full moon. I tried to look up tide data, which is out there, but I'm on my phone and didn't want to bother with ftp or CSV stuff, heh. Probably just a coincidence but was interesting to me at least.
Roughly half of all earthquakes are within one week of a full moon.
Re: Gravitational pull 'has role in quakes'
#9I looked up the San Francisco 1989 earthquake and it was 2 days past a full moon. I tried to look up tide data, which is out there, but I'm on my phone and didn't want to bother with ftp or CSV stuff, heh. Probably just a coincidence but was interesting to me at least.
Roughly half of all earthquakes are within one week of a full moon.
For those surprised by this (like me), consider that roughly half of your life is within one week of a full moon. A lunar cycle is 29-30 days, and two weeks (one before and one after) is roughly half of that cycle.
Re: Gravitational pull 'has role in quakes'
#10I looked up the San Francisco 1989 earthquake and it was 2 days past a full moon. I tried to look up tide data, which is out there, but I'm on my phone and didn't want to bother with ftp or CSV stuff, heh. Probably just a coincidence but was interesting to me at least.
Roughly half of all earthquakes are within one week of a full moon.
I dont believe the phase of the moon as anything to do with the earthquakes, more the orbital position...