1. How to read the graph
-Vertical axis : Received signal strength (detection output potential mV)
-Horizontal axis : Time (JST)
-EQ : Occured Time of Noto Peninsula Earthquake (2024/1/1 16 : 10)
2. Transmitting broadcast station
-Kushiro : NHK-1 585kHz 10kW
-Sapporo : NHK-1 567kHz 100kW
-Akita : NHK-11503kHz 10kW
-Sendai : NHK-1 891kHz 20kW
-Niigata : NHK-1 837kHz 10kW
-Osaka : NHK-1 666kHz 100kW
-Matsue : NHK-1 1296kHz 10kW
-Hiroshima : NHK-1 1071kHz 20kW
-Fukuoka : NHK-1 612kHz 100kW
-Soul : KBS Soul Radio 972kHz 1500kW
-Pusan : KBS Pusan Radio 891kHz 250kW
-Chejudo : KBS Chejudo Radio 621kHz 10kW
3. Receiving point
-Near Hashimoto Station, Midori Ward, Sagamihara City, Kanagawa Prefecture
4. Anomary Condition
-At most of the paths listed below, the electric field was received at a level higher than that received at night,
synchronized approximately 6 hours before the earthquake (9:49-11:10) even though it was daytime.
-It is thought that AM broadcast waves were reflected by a layer that suddenly appeared below the ionospheric E layer
(altitude 90km to 130km).
-It was observed that the layer that suddenly appeared about 1.5 hours after the earthquake had completely disappeared.
-A similar anomaly was observed 2 to 4 days before M4.6 in northern Wakayama Prefecture on March 15, 2021. Click here for details
5. Anomaly Data
- Kushiro Hokkaido
- Sapporo Hokkaido
- Akita
- Sendai Miyagi Pref.
- Niigata
- Osaka
- Matsu Shimane Pref.
- Hiroshima
- Fukuoka
- Soul Korea
- Pusan Korea
- Chejudo Korea
