Strong mag. 6.9 earthquake - on Wednesday, 18 August 2021 at 10:10 (GMT) - information

Strong mag. 6.9 earthquake - Coral Sea, 74 km north of Santo, Luganville, Sanma Province, Vanuatu, on Wednesday, Aug 18, 2021 at 9:10 pm (GMT +11)

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Strong mag. 6.9 earthquake - Coral Sea, 74 km north of Santo, Luganville, Sanma Province, Vanuatu, on Wednesday, Aug 18, 2021 at 9:10 pm (GMT +11) Strong mag. 6.9 earthquake - Coral Sea, 74 km north of Santo, Luganville, Sanma Province, Vanuatu, on Wednesday, Aug 18, 2021 at 9:10 pm (GMT +11)

Strong magnitude 6.9 earthquake at 90 km depth

18 Aug 10:16 UTC: First to report: VolcanoDiscovery after 6 minutes.
18 Aug 10:17: Now using data updates from USGS
... [show all] ...
18 Aug 10:51: Magnitude recalculated from 6.8 to 6.9. Hypocenter depth recalculated from 91.0 to 89.5 km (from 57 to 56 mi). Epicenter location corrected by 4.3 km (2.7 mi) towards NNE.
Update Wed, 18 Aug 2021, 10:24
Very strong magnitude 7.1 quake hits 71 km northwest of Luganville, Vanuatu in the evening
7.1 quake 18 Aug 9:10 pm (GMT +11)
7.1 quake 18 Aug 9:10 pm (GMT +11)
An intermediate magnitude 7.1 earthquake was reported in the evening near Luganville, Sanma Province, Vanuatu.
According to the United States Geological Survey, the quake hit on Wednesday 18 August 2021 at 9:10 pm local time at an intermediate depth of 84 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 Geoscience Australia (GeoAu) which listed the quake at magnitude 6.7. Other agencies reporting the same quake include France's Réseau National de Surveillance Sismique (RéNaSS) at magnitude 6.4, Indonesia's Meteorology, Climatology, and Geophysical Agency at magnitude 6.8, the European-Mediterranean Seismological Centre (EMSC) at magnitude 6.8, and the German Research Centre for Geosciences (GFZ) at magnitude 6.7.
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 have been widely felt by almost everyone in the area of the epicenter. It might have caused light to moderate damage.
Moderate shaking probably occurred in Port-Olry (pop. 2,000) located 20 km from the epicenter, Luganville (pop. 13,400) 71 km away, Sola (pop. 1,200) 134 km away, Norsup (pop. 3,000) 137 km away, and Lakatoro (pop. 710) 141 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 data

Earthquake details

Date & timeAug 18, 2021 10:10:04 UTC -
Local time at epicenterWednesday, Aug 18, 2021 at 9:10 pm (GMT +11)
StatusConfirmed
Magnitude6.9
Depth89.5 km
Epicenter latitude / longitude14.8584°S / 167.1048°E (Coral Sea, Vanuatu)
Antipode14.858°N / 12.895°W
Shaking intensityModerate shaking
Felt21 reports
Primary data sourceUSGS (United States Geological Survey)
Nearest volcanoGaua (94 km / 58 mi)
Nearby towns and cities21 km (13 mi) N of Port-Olry (pop: 1,950) | Show on map | Quakes nearby
74 km (46 mi) N of Santo (Luganville) (pop: 13,400) | Show on map | Quakes nearby
119 km (74 mi) SSW of Sola (pop: 1,170) | Show on map | Quakes nearby
138 km (86 mi) NNW of Norsup (pop: 3,000) | Show on map | Quakes nearby
345 km (214 mi) NNW of Port Vila (pop: 35,900) | Show on map | Quakes nearby
92 km (57 mi) N of St. Bartholomew Island (pop: 4,270) | Show on map | Quakes nearby
163 km (101 mi) NNW of Malakula Island (pop: 22,900) | Show on map | Quakes nearby
Weather at epicenter at time of quakeBroken Clouds 26.2°C (79 F), humidity: 82%, wind: 4 m/s (8 kts) from SE
Estimated seismic energy released1.4 x 1015 joules (392 gigawatt hours, equivalent to 3.4 x 105 tons of TNT or 21.1 atomic bombs!) | 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
6.990 kmVanuatuUSGS
6.998 kmVanuatu IslandsGFZ
6.9100 kmVANUATUEMSC
6.682 kmVanuatu IslandsBMKG
6.5113 kmVanuatu: Near NouméaRENASS
6.994 kmVanuatu IslandsGeoAu
6.6111 kmVanuatu Islands [Sea: Vanuatu]INGV

User reports for this quake (29)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
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Port olry. North East of Santo / Moderate shaking (MMI V) / rattling, vibrating / 5-10 s : A rattling sound....then the shaking for about 10 to 15 seconds... objects fall... A water tank spill out some litre of water.... An old structure of ten metre high...its ceiling, parts of it crumble... | 20 users found this interesting.  
Mele Village, Efate (338.4 km SSE of epicenter) [Map] / Light shaking (MMI IV) / horizontal (sideways) swinging / 15-20 s : Earthquake was abit heavy but no damages. | 18 users found this interesting. (reported through our app)  
Looelooe,South East of Santo / Very strong shaking (MMI VII) / both vertical and horizontal swinging : I thought my house was gonna bend into half... | 15 users found this interesting.  
Luganville / Strong shaking (MMI VI) / complex rolling (tilting in multiple directions) / 30-60 s : Shaken ! Power went off | 10 users found this interesting.  
Port Vila, Efate (342.4 km SSE of epicenter) [Map] / Light shaking (MMI IV) / horizontal (sideways) swinging / 20-30 s : Light shaking for an extended period | 9 users found this interesting. (reported through our app)  
Luganville / Moderate shaking (MMI V) / rattling, vibrating / 15-20 s : Moderate shaking. It scared the dogs | 8 users found this interesting.  
Seven Hills (2659.1 km SW of epicenter) [Map] / not felt : Nothing felt | 5 users found this interesting. (reported through our app)  
Noumea New Caledonia (828.1 km S of epicenter) [Map] / Very weak shaking (MMI II) / 30-60 s : Very weak shaking, water moving inside the glass | 5 users found this interesting.  
Ipswich, (2045.3 km SW of epicenter) [Map] / not felt : Nothing felt. Located south of Ipswich, approx 50km east of Brisbane City. | 4 users found this interesting. (reported through our app)  
  • A little far away DYT
Port Vila, Shefa (337.8 km SSE of epicenter) [Map] / Weak shaking (MMI III) / horizontal (sideways) swinging / 5-10 s : Almost didn't notice it | One user found this interesting. (reported through our app)  
Blacktown, New South Wales (2659.1 km SW of epicenter) [Map] / not felt : Nothing felt | One user found this interesting. (reported through our app)  
Luganville town Vanuatu / Very weak shaking (MMI II) / 15-20 s : it was the longest shake i ever feel in my life | One user found this interesting.  
South Grafton, Clarence Valley (2207.4 km SW of epicenter) [Map] / not felt (reported through our app)
Port Vila, Shefa (338.7 km SSE of epicenter) [Map] / not felt (reported through our app)
Coral Sea (900.3 km SSW of epicenter) [Map] / Strong shaking (MMI VI) / vibration and rolling / 1-2 minutes
Luganville, Sanma (73 km S of epicenter) [Map] / Strong shaking (MMI VI) / horizontal (sideways) swinging / 15-20 s
port vila (347.2 km SSE of epicenter) [Map] / Weak shaking (MMI III) / horizontal (sideways) swinging / 15-20 s
Santo / Very strong shaking (MMI VII) / vertical swinging (up and down) / 30-60 s
Port Vila Vanuatu (346.9 km SSE of epicenter) [Map] / not felt
Malekula / Strong shaking (MMI VI) / complex rolling (tilting in multiple directions) / 30-60 s
Port Vila / Light shaking (MMI IV) / 10-15 s
Wollongong (2721 km SSW of epicenter) [Map] / not felt (reported through our app)
Barrier beach (69.9 km S of epicenter) [Map] / Strong shaking (MMI VI) / rattling, vibrating / 20-30 s
One Tree Point, bream bay, Whangarei, New Zealand (2444.1 km SSE of epicenter) [Map] / not felt (reported through our app)
Luganville / Moderate shaking (MMI V) / rattling, vibrating / 10-15 s
Motalava (139 km NNE of epicenter) [Map] / Light shaking (MMI IV) / both vertical and horizontal swinging / 20-30 s (reported through our app)
Luganville, Espiritu Santo, Vanuatu / Moderate shaking (MMI V) / 15-20 s
South Santo (84.5 km SSW of epicenter) [Map] / Strong shaking (MMI VI) / horizontal (sideways) swinging / 1-2 minutes
Luganvile, RedCorner / Moderate shaking (MMI V) / both vertical and horizontal swinging / 20-30 s
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Aftershocks

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Recorded aftershocks, latest first (33 quakes)

Date and timeMag
Depth
LocationDetails
Feb 11, 2022 23:47
25 weeks ago
4.9

10 km
Maewo Island, Penama Province, VanuatuMore
Jan 20, 2022 10:58
29 weeks ago
5.4

10 km
Coral Sea, VanuatuMore
Jan 3, 2022 00:05
31 weeks ago
4.4

105 km
Coral Sea, VanuatuMore
Dec 23, 2021 00:47
33 weeks ago
4.7

112 km
Coral Sea, 62 km N of Santo, Luganville, Sanma Province, VanuatuMore
Dec 21, 2021 01:34
33 weeks ago
5.0

159 km
Coral Sea, 86 km SE of Santo, Luganville, Sanma Province, VanuatuMore
Dec 12, 2021 13:02
34 weeks ago
4.5

220 km
Coral Sea, 51 km N of Sola, Torba, VanuatuMore
Dec 7, 2021 16:55
35 weeks ago
4.5

115 km
Coral Sea, 61 km W of Sola, Torba, VanuatuMore
Dec 5, 2021 14:22
35 weeks ago
4.5

197 km
Coral Sea, 34 km SW of Sola, Torba, VanuatuMore
Dec 3, 2021 02:25
36 weeks ago
4.2

133 km
Coral Sea, 69 km NE of Port-Olry, Sanma Province, VanuatuMore
Nov 20, 2021 10:57
37 weeks ago - felt
5.6

128 km
Coral Sea, 48 km E of Santo, Luganville, Sanma Province, VanuatuMore
Nov 14, 2021 20:23
38 weeks ago
5.2

10 km
Coral Sea, 77 km SW of Santo, Luganville, Sanma Province, VanuatuMore
Nov 13, 2021 18:25
38 weeks ago
4.2

165 km
Coral Sea, 77 km E of Santo, Luganville, Sanma Province, VanuatuMore
Nov 2, 2021 13:16
40 weeks ago
4.8

69 km
Coral Sea, 81 km E of Port-Olry, Sanma Province, VanuatuMore
Nov 1, 2021 06:50
40 weeks ago
5.0

10 km
Coral Sea, 39 km SW of Sola, Torba, VanuatuMore
Oct 31, 2021 15:35
40 weeks ago
4.5

39 km
Coral Sea, 43 km NE of Santo, Luganville, Sanma Province, VanuatuMore
Oct 18, 2021 07:26
42 weeks ago - felt
6.1

105 km
Coral Sea, VanuatuMore
Oct 17, 2021 15:57
42 weeks ago
4.9

10 km
Coral Sea, VanuatuMore
Oct 14, 2021 05:51
43 weeks ago
5.6

128 km
Coral Sea, VanuatuMore
Oct 13, 2021 22:25
43 weeks ago
4.5

198 km
Coral Sea, VanuatuMore
Oct 13, 2021 22:05
43 weeks ago
4.4

201 km
Coral Sea, VanuatuMore
Oct 2, 2021 01:41
44 weeks ago
4.3

121 km
Coral Sea, 67 km NE of Santo, Luganville, Sanma Province, VanuatuMore
Sep 30, 2021 12:07
45 weeks ago
5.1

172 km
Coral Sea, 44 km W of Sola, Torba, VanuatuMore
Sep 29, 2021 00:31
45 weeks ago
4.9

10 km
Coral Sea, 84 km SW of Santo, Luganville, Sanma Province, VanuatuMore
Sep 20, 2021 16:47
46 weeks ago
4.6

17 km
Coral Sea, 17 km NW of Port-Olry, Sanma Province, VanuatuMore
Sep 19, 2021 04:24
46 weeks ago
5.1

54 km
Coral Sea, 51 km N of Sola, Torba, VanuatuMore
Sep 17, 2021 10:48
47 weeks ago
4.8

10 km
Coral Sea, 56 km N of Sola, Torba, VanuatuMore
Sep 13, 2021 17:13
47 weeks ago
4.3

149 km
Coral Sea, 38 km NE of Santo, Luganville, Sanma Province, VanuatuMore
Sep 10, 2021 17:45
48 weeks ago
5.2

10 km
Coral Sea, 85 km S of Sola, Torba, VanuatuMore
Sep 6, 2021 06:22
48 weeks ago
4.8

41 km
Coral Sea, 83 km SW of Santo, Luganville, Sanma Province, VanuatuMore
Sep 5, 2021 12:52
48 weeks ago
5.1

42 km
Coral Sea, 90 km S of Sola, Torba, VanuatuMore
Aug 31, 2021 13:26
49 weeks ago
5.4

10 km
Coral Sea, 39 km N of Sola, Torba, VanuatuMore
Aug 30, 2021 23:24
49 weeks ago
4.9

40 km
Coral Sea, 30 km NE of Sola, Torba, VanuatuMore
Aug 30, 2021 21:03
49 weeks ago
5.0

62 km
25 km NE of Sola, Torba, VanuatuMore

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