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Appl. Phys. Lett. 99, 204101 (2011); doi:10.1063/1.3660763 (3 pages)
Ozone generation by rock fracture: Earthquake early warning?
Raúl A. Baragiola, Catherine A. Dukes, and Dawn Hedges
Engineering Physics, University of Virginia, Charlottesville, Virginia 22904, USA
(Received 10 August 2011; accepted 26 October 2011; published online 14 November 2011)
We report the production of up to 10 ppm ozone during crushing and grinding of typical terrestrial crust rocks in air, O2 and CO2 at atmospheric pressure, but not in helium or nitrogen. Ozone is formed by exoelectrons emitted by high electric fields, resulting from charge separation during fracture. The results suggest that ground level ozone produced by rock fracture, besides its potential health hazard, can be used for early warning in earthquakes and other catastrophes, such as landslides or land shifts in excavation tunnels and underground mines.
. Bit worrying with that series of quakes off the NZ coast, though. Does this tend to happen fairly regularly? I mean, a gradual increase in magnitudes of the events like that? Anyone have some historical data to hand?
Typhoons lower pressure on the land but not on the ocean bottom because pressure decrease on the ocean surface is accompanied by a change in sea level such that pressure at depth remains constant; tide-gauge data confirm the increase in sea level. Thus, lower pressure on land both lowers the normal force across the fault and increases the shear stress on a reverse fault, resulting in a slight increase in the likelihood of rupture.
Originally posted by muzzy
crikey .............. check this out
theres more than we have posted
but not for deep, under the ocean bottom faults.
Originally posted by TrueAmerican
Originally posted by muzzy
crikey .............. check this out
theres more than we have posted
Yes, that became pretty clear when I saw the URZ webicorder. I posted it a page or two back. A lot more than just the three. You got yourself a swarm going down. Just be thankful it's not a swarm of killer bees.