The 2001 "press release" concerning Freund early research,
'Restless Earth' May Give Advance Notice of Large Earthquakes
"When the rocks in the Earth's crust crackle and buckle under the onslaught of tectonic forces, the charges that are dormant in them are set free. They give rise to a dazzling array of phenomena, long known to mankind and even part of folklore in earthquake-prone regions around the globe," said Freund. "These phenomena range from anomalous electric and magnetic signals, to 'earthquake lights' that illuminate the mountain tops and strange animal behavior as well as ionospheric effects that impact how radio waves travel over long distances."
"It is both surprising and comforting that many seemingly disjointed or even inexplicable phenomena that point to impending earthquake activity seem to have just one cause -- the awaking and spreading of normally dormant charges in the rocks deep in the Earth," he said.
"It is much too early and, in fact, unwise to expect that earthquakes would soon become predictable beyond the statistical probability that is currently the state-of-the-art," Freund said. "But one day, we'll learn to read the signals that the restless Earth emits before the rocks rupture with deadly force."
PBS/Nova's report concerning Freund's recent findings
What Causes Eerie Earthquake Lights?
The skies above Earth are constantly crackling with electric activity, from aurorae that materialize at the poles to sprites that burst upwards from thunderclouds. For the most part, we know how these phenomena work. But another mysterious light source has puzzled scientists for centuries. It doesn’t appear when clouds clash or solar rays pelt the atmosphere, but when the ground rumbles underneath our feet.
During some earthquakes, people have reported glowing lights that happen just before or during the shaking. Scientists weren’t certain the phenomenon was real, let alone explainable. But now they might have an answer. In a new study published in Seismological Research Letters, scientists from Quebec’s Ministry of Natural Resources and NASA propose that grinding rock can cause stress in deep in the crust, which in some types of rock can break apart pairs of negatively-charged oxygen atoms.
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