Moderate magnitude 5.2 earthquake at 30 km depth
3 Aug 20:44 UTC: First to report: VolcanoDiscovery after 1 minute.
3 Aug 20:53: Now using data updates from GFZ
3 Aug 20:55: Epicenter location corrected by 5.4 km (3.3 mi) towards W.
3 Aug 21:04: Magnitude recalculated from 5.5 to 5.2. Hypocenter depth recalculated from 10.0 to 30.0 km (from 6.2 to 18.6 mi). Epicenter location corrected by 12 km (7.3 mi) towards W.
Update Tue, 3 Aug 2021, 21:00Significant magnitude 5.5 quake hits 119 km northeast of Hasaki, Japan early morning
5.5 quake 4 Aug 5:43 am (GMT +9)
A magnitude 5.5 earthquake near Hasaki, Chōshi-shi, Chiba, Japan, was reported only 17 minutes ago by the German Research Centre for Geosciences (GFZ), considered one of the key international agencies that monitor seismic activity worldwide. The earthquake occurred at a shallow depth of 10 km beneath the epicenter early morning on Wednesday 4 August 2021 at 5:43 am 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.
Our monitoring service identified a second report from France's Réseau National de Surveillance Sismique (RéNaSS) which listed the quake at magnitude 5.6. A third agency, the European-Mediterranean Seismological Centre (EMSC), reported the same quake at magnitude 5.5.
Based on the preliminary seismic data, the quake should not have caused any significant damage, but was probably felt by many people as light vibration in the area of the epicenter.
Weak shaking might have been felt in Hasaki (pop. 39,200) located 119 km from the epicenter, Kashima-shi (pop. 65,800) 125 km away, Hitachi (pop. 186,300) 126 km away, Katsuta (pop. 156,000) 131 km away, Hitachi-Naka (pop. 156,800) 131 km away, and Iwaki (pop. 357,300) 132 km away.
VolcanoDiscovery will automatically update magnitude and depth if these change and follow up if other significant news about the quake become available. If you're in the area, please send us your experience through our reporting mechanism, either online
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