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Strong mag. 6.4 earthquake - Solomon Sea, Solomon Islands, on Friday, Oct 15, 2021 at 1:45 pm (GMT +11) -

Strong mag. 6.4 earthquake - Solomon Sea, Solomon Islands, on Friday, Oct 15, 2021 at 1:45 pm (GMT +11) Strong mag. 6.4 earthquake - Solomon Sea, Solomon Islands, on Friday, Oct 15, 2021 at 1:45 pm (GMT +11)

Strong magnitude 6.4 earthquake at 44 km depth

15 Oct 02:52 UTC: First to report: GFZ after 8 minutes.
15 Oct 02:54: Magnitude recalculated from 6.4 to 6.3. Epicenter location corrected by 2.5 km (1.5 mi) towards NNW.
15 Oct 06:18: Magnitude recalculated from 6.3 to 6.4.
15 Oct 09:02: Hypocenter depth recalculated from 10.0 to 44.0 km (from 6.2 to 27 mi). Epicenter location corrected by 9 km (5.6 mi) towards S.

Earthquake details

Date & timeOct 15, 2021 02:45:01 UTC -
Local time at epicenterFriday, Oct 15, 2021 at 1:45 pm (GMT +11)
StatusConfirmed
Magnitude6.4
Depth44.0 km
Epicenter latitude / longitude8.92°S / 158.44°E (Solomon Sea, Solomon Islands)
Antipode8.92°N / 21.56°W
Shaking intensityModerate shaking
Felt11 reports
Primary data sourceGFZ (German Research Centre for Geosciences)
Nearest volcanounnamed (48 km / 30 mi)
Nearby towns and cities153 km (95 mi) SW of Buala (pop: 2,700) | Show on map | Quakes nearby
165 km (102 mi) WNW of Malango (pop: 10,500) | Show on map | Quakes nearby
175 km (109 mi) WNW of Honiara (pop: 56,300) | Show on map | Quakes nearby
189 km (117 mi) W of Tulagi (Florida Islands) (pop: 1,750) | Show on map | Quakes nearby
198 km (123 mi) ESE of Gizo (New Georgia Group) (pop: 6,150) | Show on map | Quakes nearby
249 km (155 mi) W of Auki (pop: 6,810) | Show on map | Quakes nearby
387 km (241 mi) SE of Buin (Papua New Guinea) (pop: 750) | Show on map | Quakes nearby
418 km (260 mi) WNW of Kirakira (Nakumwe) (pop: 1,120) | Show on map | Quakes nearby
436 km (271 mi) SE of Arawa (Papua New Guinea) (pop: 40,300) | Show on map | Quakes nearby
436 km (271 mi) SE of Panguna (Papua New Guinea) (pop: 2,920) | Show on map | Quakes nearby
Weather at epicenter at time of quakeFew Clouds 29.1°C (84 F), humidity: 70%, wind: 3 m/s (7 kts) from NNE
Estimated seismic energy released2.5 x 1014 joules (69.8 gigawatt hours, equivalent to 60036 tons of TNT or 3.8 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
6.444 kmSolomon IslandsGFZ
6.423 kmSolomon IslandsUSGS
6.420 kmSOLOMON ISLANDSEMSC
6.010 kmSolomon Islands: Near Port MoresbyRENASS
6.416 kmSolomon IslandsGeoAu
6.516 kmSolomon IslandsBMKG
6.316 kmSolomon Islands: Solomon Is. [Sea]INGV

Seismograms

Seismic station: Honiara, Solomon Islands (HNR/IU network) | Distance from quake: 175 km / 109 mi | Show on map | Station Info
Seismic station Honiara, Solomon Islands: 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 (13)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
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Chea ,Morovo Island , Morovo Lagoon Solomon iland / Very strong shaking (MMI VII) / single vertical bump / 2-5 s : Cannot understand something new in life, scared ,biggestfelt shaking I ever . some houses fell off posts . | 3 users found this interesting.  
Honiara (175.9 km ESE of epicenter) [Map] / Moderate shaking (MMI V) / horizontal (sideways) swinging / 30-60 s : Last almost a minute | 3 users found this interesting. (reported through our app)  
South Brisbane / Light shaking (MMI IV) / single vertical bump / 1-2 s : Mild-strong single amplitude wave. Like a rising swell passed under the 6 story building. Nothing shuddered but it set off alarms. | 2 users found this interesting. (reported through our app)  
Honiara (199.7 km ESE of epicenter) [Map] / Moderate shaking (MMI V) / horizontal (sideways) swinging / 1-2 minutes : Heard a residental house fell to the ground at a high school. | 3 users found this interesting.  
Honiara / Weak shaking (MMI III) / vibration and rolling / 20-30 s : Didn't feel feel compelled to leave the house and go outside of the house. | 2 users found this interesting.  
Honiara
Auki / not felt
Honiar / Very weak shaking (MMI II) / 20-30 s
Honiara / Weak shaking (MMI III) / single lateral shake / 30-60 s
Honiara / Moderate shaking (MMI V) / horizontal (sideways) swinging / 5-10 s (reported through our app)
HONIARA (177 km ESE of epicenter) [Map] / Strong shaking (MMI VI) / several minutes
Honiara, SI / Moderate shaking (MMI V) / horizontal (sideways) swinging / 20-30 s (reported through our app)
Gizo / Very weak shaking (MMI II) / single lateral shake / very short

Aftershocks

[More info]

Recorded aftershocks, latest first (2 quakes)

Date and timeMag
Depth
LocationDetails
Apr 1, 2022 16:01
35 weeks ago
4.4

98 km
Solomon Sea, 151 km NW of Honiara, Solomon IslandsMore
Oct 31, 2021 02:55
1 year 5 weeks ago
4.8

32 km
Solomon Sea, 172 km W of Honiara, Solomon IslandsMore

Earlier earthquakes in the same area

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