Editing Earthquake prediction (section)

===== Corralitos anomaly =====
Probably the most celebrated seismo-electromagnetic event ever, and one of the most frequently cited examples of a possible earthquake precursor, is the 1989 Corralitos anomaly.<ref>{{Harvnb|Hough|2010|pp=131–133}}; {{Harvnb|Thomas|Love|Johnston|2009}}.</ref> In the month prior to the [[1989 Loma Prieta earthquake]], measurements of the [[Earth's magnetic field]] at ultra-low frequencies by a [[magnetometer]] in [[Corralitos, California]], just 7&nbsp;km from the epicenter of the impending earthquake, started showing anomalous increases in amplitude. Just three hours before the quake, the measurements soared to about thirty times greater than normal, with amplitudes tapering off after the quake. Such amplitudes had not been seen in two years of operation, nor in a similar instrument located 54&nbsp;km away. To many people such apparent locality in time and space suggested an association with the earthquake.<ref>{{Harvnb|Fraser-Smith|Bernardi|McGill|Ladd|1990| p=1467}} called it "encouraging".</ref>

Additional magnetometers were subsequently deployed across northern and southern California, but after ten years and several large earthquakes, similar signals have not been observed. More recent studies have cast doubt on the connection, attributing the Corralitos signals to either unrelated magnetic disturbance<ref>{{Harvnb|Campbell|2009}}.</ref> or, even more simply, to sensor-system malfunction.<ref>{{Harvnb|Thomas|Love|Johnston|2009}}.</ref>