Alerts

Moderate magnitude 4.0 earthquake reported 7 km southwest of Inzai, Japan

Published: 20 October 2026
Categories: Global Earthquake Activity

RSS feed source: Volcano Discovery.com--Global earthquake monitor

Wednesday, Oct 21, 2026 01:19 | 1 hour ago | By: EarthquakeMonitor

A magnitude 4.0 earthquake was reported in the morning near Inzai, Inzai-shi, Chiba, Japan.
According to the European-Mediterranean Seismological Centre (EMSC), the quake struck on Wednesday, October 21st, 2026, at 10:04 am local time at an intermediate depth of 70. km. 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 reports.
Our monitoring service identified a second report from Japan’s National Research Institute for Earth Science and Disaster Resilience (NIED), which listed the quake at magnitude 4.4. A third agency, the citizen-seismograph network 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. 9,733,300), 39 km away; and Yokohama (pop. 3,777,500), 58 km away.

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Reventador Volcanic Ash Advisory: ash plume to 16,000 ft (4,900 m) as of Oct 21, 00:00 UTC

Published: 20 October 2026
Categories: Global Volcano Activity

RSS feed source: Volcano Discovery.com--Global earthquake monitor

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Sangay Volcanic Ash Advisory: ash plume to 23,000 ft (7,000 m) as of Oct 20, 23:20 UTC

Published: 20 October 2026
Categories: Global Volcano Activity

RSS feed source: Volcano Discovery.com--Global earthquake monitor

Support Us – Help Us Enhance Our Services! We’re passionate about delivering the latest volcano and earthquake data from around the globe — just for you. However, maintaining our website and free apps requires significant time, effort, and resources.
Your support helps us expand our hardware and software capabilities and empowers our dedicated editorial team. Our mission is to provide uninterrupted, real-time updates whenever an earthquake strikes or a volcano erupts — and your donations make this possible. Every contribution, big or small, is deeply appreciated. If you find our information valuable and want to help us add new features, create compelling content, and improve our technology, please consider making a donation: Donate with PayPal: Planned Features: Improved multilingual support Tsunami alerts Faster responsiveness Thanks to your past donations, we have recently added:

Click this link to continue reading the article on the source website.