Abstract
Anomalies of the electric field potential gradient have been observed in the near-ground air before earthquakes in different regions of the world. Such anomalies are likely caused by radon air ionization. In this study, the impact of this precursor was estimated according to continuous observations of the electric field in Kamchatka in 1997–2002.
Highlights
Many authors have observed that changes in the electric field behavior are precursors of earthquakes
The anomalies before earthquakes had the clear form of a negative bay with a depth of up to 500 V/m and a length ranging from several minutes to ten hours
A seismic event was taken as a situation in which one or several EQs with class K > 11 and with epicenters in a region with the coordinates (45–55)◦ N, (155–165)◦ E, including the potential gradient (PG) recording site, occurred within 24 h after an anomaly
Summary
Many authors have observed that changes in the electric field behavior are precursors of earthquakes. In 1966, anomalies of the electric field before earthquakes were observed at Matsushiro observatory in Japan [1]. These anomalies were mainly negative, and the occurrence frequency was directly proportional to the seismic activity observed at this observatory. The anomalies before earthquakes had the clear form of a negative bay with a depth of up to 500 V/m and a length ranging from several minutes to ten hours.
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