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Mag. 4.6 earthquake - Sulu Sea, 96 km northwest of Sipalay, Philippines, on Tuesday, Aug 29, 2023 09:17 pm (GMT +8) -

Mag. 4.6 earthquake - Sulu Sea, 96 km northwest of Sipalay, Philippines, on Tuesday, Aug 29, 2023 09:17 pm (GMT +8) Mag. 4.6 earthquake - Sulu Sea, 96 km northwest of Sipalay, Philippines, on Tuesday, Aug 29, 2023 09:17 pm (GMT +8)

Moderate magnitude 4.6 earthquake at 29 km depth

29 Aug 13:20 UTC: First to report: VolcanoDiscovery after 4 minutes.
29 Aug 13:35: Now using data updates from PHIVOLCS
29 Aug 14:35: Magnitude recalculated from 4.5 to 4.6. Hypocenter depth recalculated from 36.0 to 44.0 km (from 22 to 27 mi). Epicenter location corrected by 9 km (5.6 mi) towards WNW.
30 Aug 05:55: Hypocenter depth recalculated from 44.0 to 29.0 km (from 27 to 18 mi). Epicenter location corrected by 1.6 km (1 mi) towards SE.
Update Tue, 29 Aug 2023, 13:39

Moderate earthquake of magnitude 4.5 just reported 95 km southwest of Iloilo City, Philippines

4.5 quake 29 Aug 9:17 pm (GMT +8)
4.5 quake 29 Aug 9:17 pm (GMT +8)
An earthquake of magnitude 4.5 occurred only 22 minutes ago 95 km southwest of Iloilo City, Philippines, the Philippine Institute of Volcanology and Seismology (PHIVOLCS) reported.
The quake hit at a moderately shallow depth of 36 km beneath the epicenter near Iloilo City, Iloilo, Western Visayas, Philippines, in the evening on Tuesday, August 29th, 2023, at 9:17 pm local time. 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.
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 Magdalena (pop. 2,400) located 24 km from the epicenter, Tobias Fornier (pop. 2,900) 30 km away, San Joaquin (pop. 4,900) 50 km away, and Antique (pop. 4,800) 50 km away.
Other towns or cities near the epicenter where the quake might have been felt as very weak shaking include Sibalom (pop. 7,300) located 60 km from the epicenter, Miagao (pop. 8,900) 62 km away, Sipalay (pop. 24,000) 89 km away, and Iloilo City (pop. 387,700) 95 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 & timeAug 29, 2023 13:17:00 UTC -
Local time at epicenterTuesday, Aug 29, 2023 09:17 pm (GMT +8)
Depth29.0 km
Epicenter latitude / longitude10.3°N / 121.73°E Sulu Sea, Western Visayas, Philippines
Antipode10.3°S / 58.27°W
Shaking intensityWeak shaking
Felt7 reports
Primary data sourcePHIVOLCS (Philippine Institute of Volcanology and Seismology)
Nearest volcanoCanlaon (154 km / 96 mi)
Weather at epicenter at time of quakeLight Rain 28.6°C (84 F), humidity: 76%, wind: 6 m/s (12 kts) from SW
Estimated seismic energy released5 x 1011 joules (139 megawatt hours, equivalent to 120 tons of TNT) | about seismic energy
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Nearby places

Distance Place Max. shaking intensity(*) Region Country
30 km (19 mi)
ENE of epicenter
(pop: 2,420)
Province of Antique, Western Visayas
34 km (21 mi)
NE of epicenter
Tobias Fornier
(pop: 2,890)
Province of Antique, Western Visayas
63 km (39 mi)
NNE of epicenter
(pop: 7,300)
Province of Antique, Western Visayas
67 km (42 mi)
NE of epicenter
(pop: 8,880)
Province of Iloilo, Western Visayas
82 km (51 mi)
ENE of epicenter
(pop: 12,700)
Province of Iloilo, Western Visayas
96 km (59 mi)
SE of epicenter
(pop: 24,000)
Province of Negros Occidental, Western Visayas
101 km (63 mi)
ENE of epicenter
Iloilo City
(pop: 387,700)
Province of Iloilo, Western Visayas
486 km (302 mi)
N of epicenter
(pop: 1,600,000)
Not felt
Capital District, National Capital Region
(*) Shaking intensity according to the Modified Mercalli Intensity Scale (MMI) and estimated using seismic models.

Compare Quake Data

Data for the same earthquake as reported by different agencies

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 Time GMT Epicenter Agency
4.6 29 km (18 mi) 2023-08-29 13:17:00 Philippines: 026 Km S 58° W of Anini-y (Antique) PHIVOLCS (Philippine Institute of Volcanology and Seismology)


Seismic station: Davao, Philippines (DAV/IU network) | Distance from quake: 555 km / 345 mi | Show on map | Station Info
Seismic station Davao, Philippines: 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: 0.2-5.0 Hz. Source: IRIS Buffer of Uniform Data (BUD) webtool
Show more

User-reports for this quake (7)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
Leave a comment if you find a particular report interesting or want to add to it.
Flag as inappropriate.
Mark as helpful or interesting.
Send your own user report!
Miagao (66.7 km NE of epicenter) [Map] / Weak shaking (MMI III) (reported through our app)
Leon Iloilo (58.6 km NE of epicenter) [Map] / Light shaking (MMI IV) / 2-5 s
Bacolod city Philippines (141.9 km ENE of epicenter) [Map] / Weak shaking (MMI III) / horizontal (sideways) swinging / 2-5 s : Was very short. Happened twice  
Miagao, Iloilo (67.5 km NE of epicenter) [Map] / Very weak shaking (MMI II) / 5-10 s : Subtle quake approximately 2.0 magnitude  
Inabasan, Hamtic, Antique (57 km NNE of epicenter) [Map] / Very weak shaking (MMI II)
Catmon,Sibalom,Antique (62.6 km NNE of epicenter) [Map] / Very weak shaking (MMI II) / single lateral shake / 5-10 s : I WAS SITTING DOWN AND FELT THE WEAK SHAKING TWO TIMES.  
San Jose antique (54.3 km NNE of epicenter) [Map] / Weak shaking (MMI III) : I'm lying in bed and I felt it's shaking  

Earlier earthquakes in the same area

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