G - Physics – 01 – V
Patent
G - Physics
01
V
324/12
G01V 1/00 (2006.01) G01V 3/08 (2006.01)
Patent
CA 1196688
A b s t r a c t The device monitors the electrical field present in the earth, by means of at least two electrode buried in the earth. The electrodes are connected through a shielded lead to a filter FL followed by a differential amplifier (DA), a triggering circuit and an alarm organ. The circuitry of the device is dimensioned so as to detect preferentially pulses of less than a second duration and an intensity of 5 to 50 mV/m between the electrodes, and/or pulses with 1 to 30 minutes duration and an intensity of 40 to 400 µV/m between the electrodes. These two kinds of pulses occur generally a few minutes, and several hours before an earthquake, respectively, so that the time of the latter can be predicted with sufficient accuracy From an empirically determined relation between the strength of the pulse at a measuring site and the parameters of the earthquake (as epicentral distance, magnitude etc.) it is possible to predict the epicenter and the magnitude of the impending earthquake from measurements at more than three stations.
405514
Alexopoulos Cesar D.
Nomikos Konstantinos D.
Varotsos Panagiotis A.
Alexopoulos Cesar D.
Fetherstonhaugh & Co.
Nomikos Konstantinos D.
Varotsos Panagiotis A.
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