On April 18, 2025, residents of Oita Prefecture experienced a series of earthquakes, with tremors recorded at a seismic intensity of 1 or higher a total of 10 times throughout the day. The seismic activity was concentrated in the central part of the prefecture, particularly around Beppu City, where the strongest quake was measured.
The most significant earthquake struck at approximately 8:57 AM, registering a maximum seismic intensity of 3 in Beppu. According to the Japan Meteorological Agency, this earthquake had an estimated magnitude of 3.7 and occurred at a depth of about 10 kilometers. Seismic intensity of 2 was recorded in Oita City and Yufu City, while intensity of 1 was felt in Saiki City and Kitsuki City.
Despite the frequency and strength of these tremors, officials reassured the public that there was no tsunami threat associated with any of the earthquakes. The Japan Meteorological Agency confirmed that the epicenters of these quakes were all located in shallow areas, approximately 10 kilometers deep, and were part of the central fault line system.
Seismologist Sato Takahama from the Oita Regional Meteorological Observatory stated, "The occurrence of these earthquakes does not indicate an increased likelihood of a Nankai Trough earthquake. Beppu has a history of similar seismic activity, so residents should not be overly concerned and can continue their daily routines as usual." This message aims to alleviate public anxiety amid ongoing seismic events.
In light of these recent earthquakes, authorities have emphasized the importance of earthquake preparedness. They recommend that households maintain emergency supplies, including food and water, and encourage the practice of a "rolling stock" system, where families replace consumed items to keep their emergency kits up to date.
Additionally, residents are advised to secure heavy furniture to prevent it from tipping over during a quake, and to apply anti-shatter film on glass windows to reduce the risk of injury from broken glass. It’s also crucial for families to discuss communication plans and designated meeting spots in case of an emergency.
As the seismic activity continues to be monitored, the public is urged to remain vigilant and to familiarize themselves with evacuation routes and potential hazards in their surroundings. This includes checking for unstable ground that could lead to landslides, particularly in areas prone to such events after heavy rain.
In summary, while the recent earthquakes in Oita Prefecture have raised awareness about seismic risks, experts encourage a balanced approach to safety, combining vigilance with normalcy in daily life. The community's resilience and preparedness will play a vital role in navigating future seismic events.
