Fri, 24 Oct 2025, 06:58 | BY: EARTHQUAKEMONITOR
A magnitude 4.0 earthquake near Inzai, Inzai-shi, Chiba, Japan, was reported only 10 minutes ago by the European-Mediterranean Seismological Centre (EMSC), considered one of the key international agencies that monitor seismic activity worldwide. The earthquake occurred at an intermediate depth of 70. km beneath the epicenter early afternoon on Friday, October 24th, 2025, at 3:47 pm local time. The exact magnitude, epicenter, and depth of the quake might be revised within the next few hours or minutes as seismologists review data and refine their calculations, or as other agencies issue their report.
A second report was later issued by Japan’s National Research Institute for Earth Science and Disaster Resilience (NIED), which listed it as a magnitude 4.3 earthquake. A third agency, the citizen-seismograph network of RaspberryShake, reported the same quake at magnitude 4.0.
Towns or cities near the epicenter where the quake might have been felt as very weak shaking include Shiroi (pop. 62,400) located 3 km from the epicenter, Inzai (pop. 105,500) 7 km away, Yachiyo (pop. 199,500) 8 km away, Kamagaya (pop. 109,900) 9 km away, Abiko (pop. 131,800) 11 km away, Kashiwa (pop. 433,400) 13 km away, Narashino (pop. 176,200) 14 km away, Chiba (pop. 979,800) 22 km away, Tokyo (pop. 8,336,600) 39 km away, and Yokohama (pop. 3,761,600) 58 km away.
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Earthquake data:
I felt this quake
Date & time: Oct 24, 2025 03:47 pm (GMT +9) local time (24 Oct 2025 06:47 GMT)
Magnitude: 4.0
Depth: 70.00 km
Epicenter latitude / longitude: 35.8°N / 140.1°E 
(Shiroi-shi, Chiba, Japan)
Primary data source: EMSC
AloJapan.com