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On March 2, the Japan Meteorological Agency warned of more earthquakes in Chiba Prefecture, eastern Japan, after a series of tremors in recent days.
The agency said it had detected a tectonic plate movement called “slow slip” off the coast of the region. Specifically, the phenomenon is believed to be occurring off the coast of the Boso Peninsula, with unusual movements in the Earth’s crust detected around February 26.
Based on data collected up to February 28, the surface of the junction between the continental tectonic plate and the Philippine Sea tectonic plate has slipped by about 2 cm. Since February 26, the area off the eastern coast of Chiba Prefecture has recorded increased seismic activity, including a magnitude 4.9 earthquake on February 29 and a magnitude 5.2 earthquake on March 1.
Based on past data, the Japan Meteorological Agency advises people to be on guard against the risk of a strong earthquake, possibly measuring 5 on Japan's 7-level seismic scale.
Earthquakes occur when stress builds up on a fault or at the interface between tectonic plates. Rapid slippage on a fault usually causes an earthquake in seconds, while slow slippage occurs silently over days or even years and can lead to large earthquakes.
According to the Japan Geospatial Information Agency, slow slippage was recorded six times in the Boso Peninsula area between May 1996 and June 2018.
