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Observations of earthquake lights (EQL), mostly white to bluish flashes or glows lasting several seconds associated with moderate to large earthquakes, have been reported infrequently by observers since ancient times. It wasn't until the phenomenon was captured in photographs, taken during the Matsushiro earthquake swarm in Japan between 1965 and 1967, that the seismological community acknowledged their occurrence. A satisfactory theory to explain EQL, however, has been elusive and is still not agreed upon. Proposed mechanisms include piezoelectricity, frictional heating, exoelectron emissions, sonoluminescence, phosphine gas emissions, and fluid injection (electrokinetics), but the most recent theory suggests that EQL are caused by separation of positive hole charge carriers that turn rocks momentarily into p-type semiconductors (first and second references below).
While EQL sightings are often given more exotic labels, they are a recognized geophysical phenomenon that may one day contribute to the possibility of forecasting earthquakes in the few locations where they occur.
Originally posted by manotick
In his paper with Darrell Harrington, they state that an "approach that has recently shown great promise is satellite imaging of strange non-meteorological cloud formations and their correlation with earthquakes."
Originally posted by Hx3_1963
reply to post by Moshpet
So what's yer system fer sortin' out what's ringin' now and what's real? The long drawn out wave forms are from ringin' while sharp concise ones are true?
Originally posted by geogeek
reply to post by pantangele
so IF these clouds are unique (& actually exist ?) , what is physics behind it ?? Electric field sweeping up dust particles ?, or collecting cloud forming (nucleation sites ) particles .. radon radiation tracks forming cloud nucleation sites ??? sounds far fetched to me ....
[edit on 14/1/09 by geogeek]
underground water percolates into the crevices. Its expansion, contraction, friction and chemistry further reduce the cohesion. Friction heats the water and eventually generates vapor at high temperature and high pressure. The vapor erupts from an impending hypocenter to the surface through the crevices, and rises up. It forms an “Earthquake Cloud” on encountering cold air, or dissipates part of a cloud to form a cloudless space, denoted Geothermal Eruption or “Geoeruption”. The both have two basic properties: sudden appearance with heat and pressure, and a fixed vapor source in the ground, by which they can be distinguished from weather phenomena. Afterward, the yield strength of the rock drops sharply. Once it drops sufficiently, the rock yields or an earthquake occurs.
An earthquake can be predicted by three reasons. First, the tail of a vapor precursor points toward an impending epicenter, so the epicenter can be predicted. Second, the bigger the mass of the vapor, the larger the magnitude, so the magnitude can be predicted by comparing the mass with formers, whose magnitudes are in an earthquake catalog. Third, a statistic among over 500 events shows 112 days as the longest duration from vapor eruptions to relevant subsequences and 30 days as the average, so the time can be predicted.