Relevance to earthquake crustal movements in the Noto region Also the involvement of "fluids"

In the Noto region of Ishikawa prefecture, seismic activity has been active since around December 2020.

Crustal movements that have been observed since the same period have been pointed out to be related.

The mechanism continues to be debated among experts, but experts pointing out the involvement of "fluids" point out that seismic activity can last for at least months or half a year.

Around Suzu City Locally uplifted about 4 cm

Around Suzu City, uplift of the ground has been observed by about 4 cm since around December 2020.

According to Takuya Nishimura, an associate professor at the Kyoto University Disaster Prevention Research Institute, who continues to analyze crustal movements on the Noto Peninsula, such uplift may be caused by underground magmatic activity in areas with active volcanoes, but Noto. It is rare to be observed in areas without active volcanoes, such as the peninsula.

Did "some fluid" flow into the depth of a dozen kilometers underground?

Associate Professor Nishimura analyzes that "some kind of fluid" has flowed into the depth of about a dozen kilometers underground due to the amount of crustal movement.

It is possible that seismic activity has been activated by the fluid shifting the surrounding rock mass or by making the fluid become so-called "lubricating oil" and making the rock mass slippery.

Where did the "fluid" come from?

So where did the fluid come from?

Associate Professor Nishimura said that it is possible that the separated water rose over a long period of time from the plate that sank hundreds of kilometers underground from the Noto Peninsula from the Pacific Ocean side, without knowing the details. ..

“Need to be prepared for the possibility of seismic activity continuing for several months to half a year”

In addition, since the crustal movement is still gradual, it is thought that the fluid is moving underground, and it is necessary to be cautious about seismic activity in the future.

Associate Professor Nishimura said, "Given that the crustal movement has not subsided, seismic activity may continue for at least several months or half a year. Suzu City is close to the epicenter and the Earthquake Early Warning is not in time, so furniture I want you to continue taking measures such as preventing the fall of the earthquake and resting in a safe place even if you fall. "