Light mag. 4.9 earthquake - Japan Sea, 45 km northeast of Maizuru, Kyoto, Japan, on Tuesday, Aug 24, 2021 at 7:20 pm (GMT +9) -
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Light magnitude 4.9 earthquake at 364 km depth
24 Aug 10:28 UTC: First to report: NIED after 8 minutes.
Update Tue, 24 Aug 2021, 10:33
Moderate 4.9 quake hits near Maizuru, Maizuru-shi, Kyoto, Japan4.9 quake 24 Aug 7:20 pm (GMT +9)
An earthquake of magnitude 4.9 occurred early evening on Tuesday 24 August 2021 at 7:20 pm local time near Maizuru, Maizuru-shi, Kyoto, 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 great depth of 364.4 km. The strength of the earthquake may have been tempered by its relative great depth below the surface, which makes it feel weaker in absolute terms. 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.
According to preliminary calculations, we do not expect that the quake was felt by many people and did not cause any damage. In Obama (pop. 32,900, 40 km away), Maizuru (pop. 92,500, 45 km away), Miyazu (pop. 21,600, 45 km away), Tsuruga (pop. 68,500, 50 km away), Takefu (pop. 75,800, 57 km away), Sabae (pop. 66,300, 60 km away), Kyoto (pop. 1,459,600, 91 km away), and Ōtsu (pop. 298,200, 96 km away), the quake was probably not felt.
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.
According to preliminary data, the quake was located at a great depth of 364.4 km. The strength of the earthquake may have been tempered by its relative great depth below the surface, which makes it feel weaker in absolute terms. 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.
According to preliminary calculations, we do not expect that the quake was felt by many people and did not cause any damage. In Obama (pop. 32,900, 40 km away), Maizuru (pop. 92,500, 45 km away), Miyazu (pop. 21,600, 45 km away), Tsuruga (pop. 68,500, 50 km away), Takefu (pop. 75,800, 57 km away), Sabae (pop. 66,300, 60 km away), Kyoto (pop. 1,459,600, 91 km away), and Ōtsu (pop. 298,200, 96 km away), the quake was probably not felt.
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.
Earthquake data
Earthquake details
| Date & time | Aug 24, 2021 10:20:19 UTC - |
| Local time at epicenter | Tuesday, Aug 24, 2021 at 7:20 pm (GMT +9) |
| Status | Confirmed |
| Magnitude | 4.9 |
| Depth | 364.4 km |
| Epicenter latitude / longitude | 35.818°N / 135.544°E  (Japan Sea, Japan) |
| Antipode | 35.818°S / 44.456°W |
| Shaking intensity | Very weak shaking |
| Felt | 0 reports |
| Primary data source | NIED (National Research Institute for Earth Science and Disaster Resilience) |
| Nearest volcano | Haku-san (117 km / 73 mi) |
| Nearby towns and cities | 40 km (25 mi) NNW of Obama (pop: 32,900) | Show on map | Quakes nearby 45 km (28 mi) NNE of Maizuru (pop: 92,500) | Show on map | Quakes nearby 45 km (28 mi) NE of Miyazu (pop: 21,600) | Show on map | Quakes nearby 50 km (31 mi) WNW of Tsuruga (pop: 68,500) | Show on map | Quakes nearby 57 km (35 mi) W of Takefu (pop: 75,800) | Show on map | Quakes nearby 60 km (37 mi) WSW of Sabae (pop: 66,300) | Show on map | Quakes nearby 91 km (56 mi) NNW of Kyoto (pop: 1,459,600) | Show on map | Quakes nearby 96 km (59 mi) NNW of Ōtsu (pop: 298,200) | Show on map | Quakes nearby 125 km (78 mi) N of Osaka (pop: 2,592,400) | Show on map | Quakes nearby 375 km (233 mi) W of Tokyo (pop: 8,336,600) | Show on map | Quakes nearby 172 km (107 mi) NNE of Awaji Island (pop: 129,000) | Show on map | Quakes nearby 222 km (138 mi) W of Honshu Island (pop: 104,000,000) | Show on map | Quakes nearby 296 km (184 mi) NE of Shikoku Island (pop: 4,142,000) | Show on map | Quakes nearby |
| Weather at epicenter at time of quake | Overcast Clouds  26°C (79 F), humidity: 86%, wind: 8 m/s (16 kts) from SSE |
| Estimated seismic energy released | 1.4 x 1012 joules (392 megawatt hours, equivalent to 338 tons of TNT) | about seismic energy |
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 |
| 4.9 | 364 km | Japan: W PART OF WAKASA BAY | NIED |
| 4.3 | 357 km | Western Honshu, Japan | GFZ |
| 4.2 | 358 km | WESTERN HONSHU, JAPAN | EMSC |
| 4.2 | 358 km | Western Honshu, Japan | USGS |
User reports for this quake
User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
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