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Light mag. 4.7 earthquake - Ibaraki, 15 km north of Katori-shi, Chiba, Japan, on Friday, Sep 23, 2022 at 9:53 am (GMT +9) -

Light mag. 4.7 earthquake - Ibaraki, 15 km north of Katori-shi, Chiba, Japan, on Friday, Sep 23, 2022 at 9:53 am (GMT +9) Light mag. 4.7 earthquake - Ibaraki, 15 km north of Katori-shi, Chiba, Japan, on Friday, Sep 23, 2022 at 9:53 am (GMT +9)

Light magnitude 4.7 earthquake at 82 km depth

23 Sep 00:57 UTC: First to report: EMSC after 4 minutes.
23 Sep 00:58: Hypocenter depth recalculated from 44.0 to 80.0 km (from 27 to 50 mi). Epicenter location corrected by 7.3 km (4.5 mi) towards W.
... [show all] ...
23 Sep 01:13: Now using data updates from USGS
Update Fri, 23 Sep 2022, 01:12

Moderate magnitude 4.8 earthquake 8 km northeast of Inashiki, Japan

4.8 quake 23 Sep 9:53 am (GMT +9)
4.8 quake 23 Sep 9:53 am (GMT +9)
An intermediate magnitude 4.8 earthquake was reported in the morning near Inashiki, Inashiki-shi, Ibaraki, Japan.
According to the European-Mediterranean Seismological Centre (EMSC), the quake hit on Friday, September 23rd, 2022, at 9:53 am local time at an intermediate depth of 90 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 5.1. Other agencies reporting the same quake include the German Research Centre for Geosciences (GFZ) at magnitude 5.0, and the citizen-seismograph network of RaspberryShake at magnitude 5.0.
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 Inashiki (pop. 47,000) located 8 km from the epicenter, Ami (pop. 48,300) 14 km away, Naka (pop. 46,800) 18 km away, Ryūgasaki (pop. 85,800) 21 km away, Ushiku (pop. 80,000) 21 km away, Torite (pop. 80,700) 28 km away, and Tsukuba (pop. 175,600) 31 km away.
Other towns or cities near the epicenter where the quake might have been felt as very weak shaking include Mito (pop. 246,500) located 38 km from the epicenter, Tokyo (pop. 8,336,600) 71 km away, and Yokohama (pop. 3,574,400) 91 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 & timeSep 23, 2022 00:53:50 UTC -
Local time at epicenterFriday, Sep 23, 2022 at 9:53 am (GMT +9)
StatusConfirmed
Magnitude4.7
Depth82.1 km
Epicenter latitude / longitude36.039°N / 140.3126°E (Inashiki-gun, Ibaraki, Japan)
Antipode36.039°S / 39.687°W
Shaking intensityWeak shaking
Felt29 reports
Primary data sourceUSGS (United States Geological Survey)
Nearest volcanoTakahara (107 km / 66 mi)
Nearby towns and cities9 km (6 mi) N of Inashiki (pop: 47,000) | Show on map | Quakes nearby
10 km (6 mi) E of Ami (pop: 48,300) | Show on map | Quakes nearby
18 km (11 mi) ENE of Ushiku (pop: 80,000) | Show on map | Quakes nearby
19 km (12 mi) NE of Ryūgasaki (pop: 85,800) | Show on map | Quakes nearby
26 km (16 mi) SE of Tsukuba (pop: 175,600) | Show on map | Quakes nearby
37 km (23 mi) SSW of Mito (pop: 246,500) | Show on map | Quakes nearby
68 km (42 mi) NE of Tokyo (pop: 8,336,600) | Show on map | Quakes nearby
90 km (56 mi) NE of Yokohama (Kanagawa) (pop: 3,574,400) | Show on map | Quakes nearby
208 km (129 mi) E of Honshu Island (pop: 104,000,000) | Show on map | Quakes nearby
215 km (134 mi) NNE of Shikine-jima Island (pop: 600) | Show on map | Quakes nearby
276 km (171 mi) SE of Sado Island (pop: 55,200) | Show on map | Quakes nearby
Weather at epicenter at time of quakeLight Rain 24.9°C (77 F), humidity: 87%, wind: 1 m/s (3 kts) from NNW
Estimated seismic energy released7.1 x 1011 joules (197 megawatt hours, equivalent to 169 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.DepthLocationSource
4.782 kmNEAR EAST COAST OF HONSHU, JAPANUSGS
4.782 kmNear East Coast of Honshu, JapanRaspberryShake
4.883 kmNear East Coast of Honshu, JapanGFZ
5.188 kmJapan: Near TokyoRENASS
4.786 km9 Km N of Inashiki, JapanEMSC
4.710 kmNear East Coast Of Honshu, JapanIRIS
5.082 kmNear East Coast of Honshu, JapanGeoAu

Seismograms

Seismic station: Matsushiro, Japan (MAJO/IU network) | Distance from quake: 197 km / 123 mi | Show on map | Station Info
Seismic station Matsushiro, Japan: 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. Source: IRIS Buffer of Uniform Data (BUD) webtool
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User reports for this quake (30)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
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Tamagawagakuen (92.8 km SW of epicenter) [Map] / Light shaking (MMI IV) : I was on bed and clearly felt the shaking of my bed, glass doors vibrating And I felt it for some seconds like 10+ seconds  
Hiratsuka (120.4 km SW of epicenter) [Map] / Weak shaking (MMI III) / rattling, vibrating / 2-5 s : Laying in bed, noticed cabinets rattling, thought it was roommate, turns out it was an earthquake. 10/10 would experience again.  
masuo (37.7 km SW of epicenter) [Map] / Weak shaking (MMI III) / rattling, vibrating / 10-15 s
Urayasu, Tokyo (62.1 km SW of epicenter) [Map] / Light shaking (MMI IV) / 5-10 s
Tokyo (58.7 km SW of epicenter) [Map] / Weak shaking (MMI III) / 2-5 s
Yokosuka (101 km SW of epicenter) [Map] / Weak shaking (MMI III) / rattling, vibrating / 1-2 s
Tokyo, Meguro (70.2 km SW of epicenter) [Map] / Weak shaking (MMI III) / horizontal (sideways) swinging / 2-5 s : I was on the 6th floor. Walls moved left and right during ~5 seconds.  
Kokubunji, Tokyo (85.5 km WSW of epicenter) [Map] / Light shaking (MMI IV) / horizontal (sideways) swinging / 2-5 s
Shinagawa (70.8 km SW of epicenter) [Map] / Very weak shaking (MMI II) / horizontal (sideways) swinging / 20-30 s
Tokyo, Japan (70.5 km SW of epicenter) [Map] / Very weak shaking (MMI II) / horizontal (sideways) swinging / very short : My bed was shaking  
Tokyo (66.8 km SW of epicenter) [Map] / Light shaking (MMI IV)
Hachioji (95.2 km WSW of epicenter) [Map] / Weak shaking (MMI III) : I was sleeping and the earthquake started.  
Chuo-Ku (66 km SW of epicenter) [Map] / Very weak shaking (MMI II) / horizontal (sideways) swinging / 10-15 s : Windows rumble. Floor shook very lightly 6 floors up from the street.  
Tokyo, Shibuya (70 km SW of epicenter) [Map] / Weak shaking (MMI III) / both vertical and horizontal swinging / 2-5 s : At home  
Yamoto (100.4 km SW of epicenter) [Map] / Weak shaking (MMI III) / single lateral shake / 1-2 s : I slept building shaked  
Zama (102.5 km SW of epicenter) [Map] / Light shaking (MMI IV) / horizontal (sideways) swinging / 2-5 s (reported through our app)
Tokyo (74.1 km SW of epicenter) [Map] / Very weak shaking (MMI II) : sitting at desk and felt shaking side to side  
Urayasu, Tokyo (60 km SW of epicenter) [Map] / Very weak shaking (MMI II) : Very mild quake, felt on 2nd floor in Koto ku apartment  
Matsudo / Light shaking (MMI IV) / rattling, vibrating / 15-20 s
Yokosuka, Japan / Light shaking (MMI IV) / rattling, vibrating / 1-2 s
Tokyo, Shibuya / Weak shaking (MMI III) / horizontal (sideways) swinging / 10-15 s
Ikebukuro / not felt
Ueno / Weak shaking (MMI III) / rattling, vibrating / 2-5 s
Sanmu,Chiba / Light shaking (MMI IV) / horizontal (sideways) swinging / 2-5 s (reported through our app)
Ageo / Weak shaking (MMI III) / horizontal (sideways) swinging / 2-5 s
Narita airport / Very weak shaking (MMI II) / horizontal (sideways) swinging / 2-5 s : Weak. Side to side  
Camp zama / Weak shaking (MMI III) / rattling, vibrating / 10-15 s : Light shaking while sitting in bed  
Meguro, Tokyo / Weak shaking (MMI III) / single lateral shake / 1-2 s : It was just a quick jolt.  
Fussa / Weak shaking (MMI III) / 2-5 s
Unane setagaya ku / Light shaking (MMI IV) / both vertical and horizontal swinging / 5-10 s (reported through our app)
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