Light mag. 4.6 earthquake - Naka-gun, 20 km northeast of Mito, Ibaraki, Japan, on Sunday, Sep 19, 2021 8:07 am (GMT +9) -

Light mag. 4.6 earthquake - Naka-gun, 20 km northeast of Mito, Ibaraki, Japan, on Sunday, Sep 19, 2021 8:07 am (GMT +9)

Light magnitude 4.6 earthquake at 55 km depth

18 Sep 23:18 UTC: First to report: NIED after 10 minutes.
Update Sat, 18 Sep 2021, 23:24
Moderate magnitude 4.6 earthquake 20 km northeast of Mito, Japan
4.6 quake 19 Sep 8:07 am (GMT +9)
4.6 quake 19 Sep 8:07 am (GMT +9)
A magnitude 4.6 earthquake near Mito, Mito-shi, Ibaraki, Japan, was reported only 16 minutes ago by Japan's National Research Institute for Earth Science and Disaster Resilience (NIED), considered the main national agency that monitors seismic activity in this part of the world. The earthquake occurred at a moderately shallow depth of 55 km beneath the epicenter in the morning on Sunday, September 19th, 2021, at 8:07 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 the European-Mediterranean Seismological Centre (EMSC) which listed the quake at magnitude 4.2.
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 Funaishikawa (pop. 35,300) located 4 km from the epicenter, Hitachi-Naka (pop. 156,800) 11 km away, Katsuta (pop. 156,000) 12 km away, Hitachi (pop. 186,300) 15 km away, Ōmiya (pop. 27,600) 19 km away, Mito (pop. 246,500) 20 km away, Okunoya (pop. 34,600) 27 km away, and Kitaibaraki (pop. 50,800) 37 km away.
Other towns or cities near the epicenter where the quake might have been felt as very weak shaking include Saitama (pop. 1,193,400) located 106 km from the epicenter.
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 or via our mobile app. This will help us provide more first-hand updates to anyone around the globe who wants to know more about this quake.
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Earthquake data

Date & time: Sep 18, 2021 23:07:49 UTC -
Local time at epicenter: Sunday, Sep 19, 2021 8:07 am (GMT +9)
Magnitude: 4.6
Depth: 55.0 km
Epicenter latitude / longitude: 36.472°N / 140.609°E (Naka-gun, Ibaraki, Japan)
Antipode: 36.472°S / 39.391°W
Nearest volcano: Takahara (88 km / 55 mi)
Nearby towns and cities:
4 km (2 mi) E of Funaishikawa (Naka-gun) (pop: 35,300) --> See nearby quakes!
11 km (7 mi) NE of Hitachi-Naka (pop: 156,800) --> See nearby quakes!
12 km (7 mi) NE of Katsuta (pop: 156,000) --> See nearby quakes!
15 km (9 mi) SSW of Hitachi (pop: 186,300) --> See nearby quakes!
19 km (12 mi) ESE of Ōmiya (Hitachiomiya) (pop: 27,600) --> See nearby quakes!
20 km (12 mi) NE of Mito (pop: 246,500) --> See nearby quakes!
27 km (17 mi) NE of Okunoya (Higashiibaraki District) (pop: 34,600) --> See nearby quakes!
37 km (23 mi) SSW of Kitaibaraki (pop: 50,800) --> See nearby quakes!
106 km (66 mi) NE of Saitama (pop: 1,193,400) --> See nearby quakes!
120 km (74 mi) NE of Tokyo (pop: 8,336,600) --> See nearby quakes!
Weather at epicenter at time of quake:
Overcast Clouds 23.2°C (74 F), humidity: 87%, wind: 7 m/s (14 kts) from NE
Primary data source: NIED (National Research Institute for Earth Science and Disaster Resilience)
Estimated released energy: 5 x 1011 joules (139 megawatt hours, equivalent to 120 tons of TNT) More info
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Data for the same earthquake reported by different agencies

Info: The more agencies report about the same quake and post similar data, the more confidence you can have in the data. It takes normally up to a few hours until earthquake parameters are calculated with near-optimum precision.
4.472 km4 Km SE of Ōmiya, JapanUSGS
4.675 kmNear East Coast of Honshu, JapanGFZ

User reports for this quake (1)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
Tokyo / Weak shaking (MMI III) / horizontal (sideways) swinging / 1-2 s
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