In the early hours of the 11th, there was a magnitude 5.4 earthquake with an epicenter in the northern part of the Soya region of Hokkaido, and tremors with a seismic intensity of upper 5 were observed in Nakagawa Town.
In Nakagawa-cho, an earthquake with a seismic intensity of 5-lower occurred just before this earthquake, and there have been a series of earthquakes since then. I am calling.
According to the Japan Meteorological Agency, an earthquake with a magnitude of 5.4 occurred at around 0:53 am on the 11th, with an epicenter in the northern part of the Soya region of Hokkaido.
There was no tsunami from this earthquake.
A seismic intensity 5-upper tremor was observed in Nakagawa-cho, Hokkaido, a seismic intensity 4-strike was observed in Enbetsu-cho, Toyotomi-cho, Horonobe-cho, and Sarufutsu-mura, and seismic intensity 3-1 tremors were observed in various parts of northern Hokkaido.
An earthquake with a magnitude of 5.2 occurred in the northern part of the Soya region at around 0:35 a.m., about 20 minutes before this earthquake, and a seismic intensity of lower 5 was observed in Nakagawa-cho.
In northern Hokkaido, there were earthquakes before and after the magnitude 5.4 earthquake, and there were 15 earthquakes with a seismic intensity of 1 or more by 4:30 a.m., including earthquakes with a seismic intensity of 5 upper and 5 lower. is climbing.
According to the Japan Meteorological Agency, earthquakes with a seismic intensity of 5-upper and 5-lower all have epicenter depths as shallow as 4 kilometers, and seismic activity tends to increase when a relatively large-scale earthquake occurs in such a place.
Also, in Nakagawa-cho, the ground was loosened due to record heavy rain on August 8 due to the influence of the front.
The Japan Meteorological Agency has warned of earthquakes with a seismic intensity of about 5 upper for about a week, and is calling for vigilance against landslide disasters caused by future rain and earthquakes in Nakagawa Town.
Warning standards lowered in Nakagawa-cho
In Nakagawa-cho, Hokkaido, where tremors with a seismic intensity of upper 5 were observed in this earthquake, the Japan Meteorological Agency said that the strong tremors loosened the ground and the risk of landslide disasters due to rain is higher than usual. In addition, the standard for landslide warning information jointly announced by the prefecture and the Meteorological Observatory has been lowered to 80% of the normal level.
For the time being, the Japan Meteorological Agency and the Ministry of Land, Infrastructure, Transport and Tourism have decided to operate according to this standard. In such cases, we want you to ensure safety by evacuating early.
The road surface is raised and closed to traffic
On Route 541 in Utanai, Nakagawa-cho, where tremors with a seismic intensity of upper 5 were observed, the road surface was uplifted and the side of the road collapsed.
The Asahikawa Construction Management Department in Hokkaido has closed the area around the site from 3:00 am and is investigating the detailed situation.