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Moderate mag. 4.8 earthquake - North Pacific Ocean, 93 km northeast of Iwaki, Fukushima, Japan, on Wednesday, Jan 25, 2023 at 10:00 am (GMT +9) -

Moderate magnitude 4.8 earthquake at 46 km depth

25 Jan 01:07 UTC: First to report: NIED after 6 minutes.
25 Jan 01:48: Now using data updates from USGS
25 Jan 23:28: Magnitude recalculated from 5.2 to 4.8. Hypocenter depth recalculated from 39.6 to 45.6 km (from 25 to 28 mi). Epicenter location corrected by 2.1 km (1.3 mi) towards WSW.

Update Wed, 25 Jan 2023, 01:21

Magnitude 5.4 earthquake strikes near Iwaki, Iwaki-shi, Fukushima, Japan

5.4 quake 25 Jan 10:00 am (GMT +9)

An earthquake of magnitude 5.4 occurred in the morning on Wednesday, January 25th, 2023, at 10:00 am local time near Iwaki, Iwaki-shi, Fukushima, Japan, as reported by Japan's National Research Institute for Earth Science and Disaster Resilience (NIED).
According to preliminary data, the quake was located at a moderately shallow depth of 50 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 report.
Our monitoring service identified a second report from France's Réseau National de Surveillance Sismique (RéNaSS) which listed the quake at magnitude 5.3. Other agencies reporting the same quake include the European-Mediterranean Seismological Centre (EMSC) at magnitude 5.1, the citizen-seismograph network of RaspberryShake at magnitude 5.2, and the German Research Centre for Geosciences (GFZ) at magnitude 5.2.
Generally quakes of this magnitude are recorded by more than one agency and the results can vary, with subsequent reports that come in after the first one often showing more accuracy.
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 Namie (pop. 21,900) located 59 km from the epicenter, Watari (pop. 36,300) 88 km away, Iwaki (pop. 357,300) 89 km away, Kakuda (pop. 33,200) 90 km away, Iwanuma (pop. 42,400) 92 km away, Funehikimachi-funehiki (pop. 23,500) 96 km away, Ōkawara (pop. 23,300) 98 km away, and Ishinomaki (pop. 117,200) 100 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 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 details

Date & time	Jan 25, 2023 01:00:48 UTC -
Local time at epicenter	Wednesday, Jan 25, 2023 at 10:00 am (GMT +9)
Status	Confirmed
Magnitude	4.8
Depth	45.6 km
Epicenter latitude / longitude	37.5881°N / 141.6819°E (North Pacific Ocean, Japan)
Antipode	37.588°S / 38.318°W
Shaking intensity	Weak shaking
Felt	2 reports
Primary data source	USGS (United States Geological Survey)
Nearest volcano	Adatara (123 km / 76 mi)
Nearby towns and cities	61 km (38 mi) ENE of Namie (Futaba-gun) (pop: 21,900) \| Show on map \| Quakes nearby 88 km (55 mi) ESE of Watari (pop: 36,300) \| Show on map \| Quakes nearby 92 km (57 mi) SE of Iwanuma (pop: 42,400) \| Show on map \| Quakes nearby 93 km (58 mi) NE of Iwaki (pop: 357,300) \| Show on map \| Quakes nearby 98 km (61 mi) SSE of Ishinomaki (pop: 117,200) \| Show on map \| Quakes nearby 99 km (62 mi) SE of Schiogama (pop: 59,500) \| Show on map \| Quakes nearby 260 km (161 mi) NE of Saitama (pop: 1,193,400) \| Show on map \| Quakes nearby 276 km (171 mi) NE of Tokyo (pop: 8,336,600) \| Show on map \| Quakes nearby 82 km (51 mi) SSE of Tashiro Jima Island (pop: 100) \| Show on map \| Quakes nearby 372 km (231 mi) ENE of Honshu Island (pop: 104,000,000) \| Show on map \| Quakes nearby
Weather at epicenter at time of quake	Overcast Clouds -1.3°C (30 F), humidity: 68%, wind: 18 m/s (36 kts) from WNW
Estimated seismic energy released	1 x 10¹² joules (278 megawatt hours, equivalent to 239 tons of TNT) \| about seismic energy

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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.

Mag.	Depth	Location	Source
4.8	46 km	61 Km E of Namie, Japan	USGS
5.1	57 km	Near East Coast of Honshu, Japan	GFZ
4.8	46 km	Near East Coast of Honshu, Japan	RaspberryShake
5.2	60 km	NEAR EAST COAST OF HONSHU, JAPAN	EMSC
5.1	10 km	Japan: Near Sendai	RENASS
5.4	50 km	63 Km E of Namie, Japan	NIED
5.2	10 km	Near East Coast Of Honshu, Japan	IRIS
5.3	57 km	Near East Coast of Honshu, Japan	GeoAu

Most recent quakes Top 20 past 24 hrs Quakes in Japan

Seismograms

Seismic station: Miyagi Marumori (JMM/JP network) | Distance from quake: 84 km / 52 mi | Show on map | Station Info

Seismic station Miyagi Marumori: vertical movement plot around time of quake (source: IRIS/BUD)

Seismogram (vertical component) around time of quake. Thin dotted red line indicates time of quake. Seismic waves arrive some time later, depending on distance. Bandpass filter applied: 0.2-10.0 Hz. Source: IRIS Buffer of Uniform Data (BUD) webtool

User reports for this quake (2)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.

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Sendai, Miyagi (109.1 km NW of epicenter) [Map] / Light shaking (MMI IV) / rattling, vibrating / 10-15 s (reported through our app)

Sendai / Very weak shaking (MMI II) / rattling, vibrating / 5-10 s

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