Key Facts
• On November 9, 2025, at 5:03 PM, a magnitude 6.7 earthquake struck off Sanriku.
• Maximum seismic intensity recorded was 4; epicenter depth estimated at 10 km.
• Affected regions include Kanto, Tohoku, Chubu, and Hokkaido.
• Population in affected areas (intensity 1 or higher): approximately 31.44 million.
• 28.3% of the affected population (8.91 million) are aged 65 or older.
• Chiba Prefecture recorded intensity 2 in Urayasu and Minamiboso; intensity 1 in 13 other areas.
• Intensity 4 was observed in Morioka and Yahaba (Iwate) and Wakuya (Miyagi).
• Japan Meteorological Agency issued a tsunami advisory for coastal areas.
• Tokyo’s affected population: 8.84 million, with 22.6% aged 65 or older.
• Hokkaido’s affected population: 3.22 million, with 31.7% aged 65 or older.
Summary
A magnitude 6.7 earthquake struck off the coast of Sanriku, Japan, on November 9, 2025, at 5:03 PM. The quake, with a maximum seismic intensity of 4 and a depth of 10 km, impacted regions across Kanto, Tohoku, Chubu, and Hokkaido. Approximately 31.44 million people were in areas experiencing intensity 1 or higher, with 28.3% of them aged 65 or older. Chiba Prefecture recorded intensity 2 in Urayasu and Minamiboso, while intensity 4 was observed in parts of Iwate and Miyagi. The Japan Meteorological Agency issued a tsunami advisory, urging caution. Tokyo and Hokkaido were among the most affected areas, with populations of 8.84 million and 3.22 million, respectively. This event highlights the importance of disaster preparedness, especially for vulnerable populations.
