Around the active fault that caused the series of Kumamoto earthquakes, the number of earthquakes is decreasing year by year, but it is higher than before the earthquake.
In addition, the Japan Meteorological Agency is calling for continued preparations for strong tremors, as it is said that the degree of urgency of a large earthquake is high on active faults in the vicinity.
The number of earthquakes is decreasing, but it is higher than before the Kumamoto earthquake.
In the series of Kumamoto earthquakes, there were a series of earthquakes in the area, such as two violent tremors with a seismic intensity of 7 in Mashiki Town.
According to the Japan Meteorological Agency, the earthquake occurred around the "Futagawa Fault Zone" and "Hinagu Fault Zone" running east and west in Kumamoto Prefecture, accompanied by shaking with a seismic intensity of 1 or more between the occurrence of the earthquake and last month. It means that a total of 4808 earthquakes were observed.
Looking at each year, the number of
earthquakes in 2016 was 4211, which was the highest.
▽ 245 in 2017 ▽
108 in 2018 ▽
111 in 2019 ▽
65 in 2020
▽ 64 in 2021 last year It means that it is on a downward trend.
However, the number of earthquakes that observed seismic intensity 1 in the five years before the Kumamoto earthquake was 49.2 times per year, which means that the current seismic activity is still more active than before the Kumamoto earthquake.
There are also active faults that have not moved in the vicinity
In addition, according to the government's Earthquake Research Committee, the "Hinagu Fault Zone" was displaced only in a part of the north side during the Kumamoto earthquake, and there is still a risk of a large earthquake in the rest.
The probability of an earthquake occurring within the next 30 years is approximately 0% to 6% in the northeastern "Hinagu section" and approximately 0% to 16% in the southwestern "Yatsushirokai section" of the Hinagu fault zone. %, And the degree of urgency of the occurrence of an earthquake is evaluated as the highest "S rank".
Japan Meteorological Agency "Continue to prepare for strong shaking"
Kazuki Miyaoka, Seismic Information Planning Officer of the Japan Meteorological Agency, said, "The seismic activity has calmed down a lot overall, but the seismic activity is still continuing mainly in the Futagawa-Hinagu fault zone. It happened 6 years ago. However, this does not mean that another big earthquake will occur in the surrounding area, so please do not relax and continue to prepare for strong shaking. "