Reported quake or seismic-like event: 5.5 km northwest of Ha Noi, Hanoi, Vietnam, Wednesday, Aug 4, 2021 at 6:21 pm (GMT +7)

4 Aug 11:20 UTC: First to report: VolcanoDiscovery after 30 seconds.

Earthquake details

Date & time	Aug 4, 2021 11:21:57 UTC
Local time at epicenter	Wednesday, Aug 4, 2021 at 6:21 pm (GMT +7)
Status	highly uncertain
Magnitude	unknown
Depth	10.0 km
Epicenter latitude / longitude	21.06477°N / 105.81036°E (Hanoi, Vietnam)
Antipode	21.065°S / 74.19°W
Shaking intensity	Very weak shaking
Felt	4 reports
Primary data source	VolcanoDiscovery (User-reported shaking)
Nearest volcano	###NEARESTVOLCANO2###
Nearby towns and cities	6 km (3 mi) NW of Ha Noi (pop: 8,053,700) \| Show on map \| Quakes nearby 11 km (7 mi) NNE of Hà Đông (pop: 50,900) \| Show on map \| Quakes nearby 33 km (20 mi) ESE of Sơn Tây (pop: 40,600) \| Show on map \| Quakes nearby 39 km (24 mi) WSW of Cung Kiệm (Bắc Ninh) (pop: 80,000) \| Show on map \| Quakes nearby 88 km (55 mi) NW of Thai Bình (Thái Bình) (pop: 53,100) \| Show on map \| Quakes nearby 91 km (57 mi) NNW of Ninh Binh (Ninh Bình) (pop: 36,900) \| Show on map \| Quakes nearby 93 km (58 mi) WNW of Haiphong (pop: 602,700) \| Show on map \| Quakes nearby 100 km (62 mi) W of Thành Phố Uông Bi (Tỉnh Quảng Ninh) (pop: 63,800) \| Show on map \| Quakes nearby 110 km (68 mi) N of Bỉm Sơn (Tỉnh Thanh Hoa) (pop: 53,800) \| Show on map \| Quakes nearby 118 km (74 mi) SE of Yên Bai (Yên Bái) (pop: 96,500) \| Show on map \| Quakes nearby
Weather at epicenter at time of quake
Estimated seismic energy released	2 x 10⁹ joules (554 kilowatt hours, equivalent to 0.477 tons of TNT) \| about seismic energy

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Seismograms

Seismic station: Son La Vietnam (SLV/RM network) | Distance from quake: 199 km / 124 mi | Show on map | Station Info

Seismic station Son La Vietnam: 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: 0.5-10.0 Hz. Source: IRIS Buffer of Uniform Data (BUD) webtool

User reports for this quake (4)

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

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Translate

Hanoi Vietnam (2.7 km N of epicenter) [Map] / Very weak shaking (MMI II) / horizontal (sideways) swinging / 5-10 s : Very weak swinging

Tay ho Hanoi / Very weak shaking (MMI II) / horizontal (sideways) swinging / 30-60 s

Hanoi / Very weak shaking (MMI II) / horizontal (sideways) swinging / 20-30 s

Hanoi (2.7 km S of epicenter) [Map] / Very weak shaking (MMI II) / horizontal (sideways) swinging / very short

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