Decametric radiation at the time of the Hyogo‐ken Nanbu Earthquake near Kobe in 1995

Abstract

The Hyogo‐ken Nanbu earthquake (JMA Magnitude = 7.2) occurred on January 17, 1995, near Kobe in Hyogo‐ken prefecture, Japan. Unusual pulsed radio emissions at 22.2 MHz (wavelength = 13.5 m) were detected with a radio interferometer at Nishi‐harima Astronomical Observatory, located about 77 km from the epicenter, both before and after this earthquake. These data indicate that one of the most probable source regions was the central part of the Nojima fault, about 25 km from downtown Kobe, and the average pulsed power appeared to be about 0.2 W.