‘Slow Slip’ Phenomenon Behind Intensifying Seismic Activities in Eastern Sea Off Chiba Pref. in Japan
14:35 JST, March 2, 2024
The “slow slip” phenomenon was observed in the sea off the eastern coast of Chiba Prefecture for the first time in about five years and eight months, the government’s Earthquake Research Committee said Friday.
In the past, an earthquake registering up to lower 5 on the Japanese seismic intensity scale occurred several months after the phenomenon, so the committee is calling on the public to stay alert.
The slow slip phenomenon is the slow shift of underground plates. It was observed in the area surrounding epicenters of the recent frequent earthquakes, where seismic activity has been intensifying since Feb. 26.
According to the committee, as of Wednesday, a slow slip of up to 2 centimeters has occurred at the boundary between the Philippine Sea plate and the Pacific plate.
From 1996 to 2018, the area saw six seismic activities involving slow slips, and each activity lasted from one week to several months.
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