Key Facts
• On November 2, 2025, at 11:15 PM, an earthquake struck southern Ibaraki Prefecture.
• Magnitude estimated at 3.5, with a maximum seismic intensity of 2.
• Epicenter depth: approximately 40 kilometers.
• Affected population: 7.39 million people, including 26.9% aged 65 or older.
• No tsunami risk reported.
• Seismic intensity 2 observed in Kasama City, Ibaraki, and Tochigi City, Tochigi.
• Seismic intensity 1 recorded in parts of Chiba, Saitama, Tokyo, Ibaraki, Tochigi, and Gunma.
• Chiba Prefecture: Noda City and Kashiwa City experienced seismic intensity 1.
• Population breakdown by prefecture: Saitama (3.27M), Ibaraki (1.72M), Tochigi (1.21M), Chiba (0.59M), Tokyo (0.55M), Gunma (0.05M).
• Elderly population at higher risk: 1.99 million people (26.9% of affected population).
Summary
An earthquake of magnitude 3.5 struck southern Ibaraki Prefecture on November 2, 2025, at 11:15 PM. The quake, with a depth of 40 kilometers, caused a maximum seismic intensity of 2 in Kasama City, Ibaraki, and Tochigi City, Tochigi. Seismic intensity 1 was recorded in various areas across Chiba, Saitama, Tokyo, Ibaraki, Tochigi, and Gunma. The affected population is approximately 7.39 million, with 26.9% aged 65 or older, highlighting a significant risk for the elderly. No tsunami risk was reported. Local authorities encourage residents to remain vigilant and prioritize disaster preparedness.
