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Light mag. 3.1 earthquake - Caribbean Sea, 16 km southeast of Guanica, Puerto Rico, on Thursday, Dec 24, 2020 at 3:51 am (GMT -4)

Light mag. 3.1 earthquake - Caribbean Sea, 16 km southeast of Guanica, Puerto Rico, on Thursday, Dec 24, 2020 at 3:51 am (GMT -4) Light mag. 3.1 earthquake - Caribbean Sea, 16 km southeast of Guanica, Puerto Rico, on Thursday, Dec 24, 2020 at 3:51 am (GMT -4)

Light magnitude 3.1 earthquake at 10 km depth

24 Dec 08:07 UTC: First to report: USGS after 17 minutes.
24 Dec 08:21: Magnitude recalculated from 3.9 to 3.6. Hypocenter depth recalculated from 10.0 to 11.0 km (from 6.2 to 6.8 mi). Epicenter location corrected by 4.5 km (2.8 mi) towards NNW.
24 Dec 09:28: Magnitude recalculated from 3.6 to 3.1. Hypocenter depth recalculated from 11.0 to 10.0 km (from 6.8 to 6.2 mi). Epicenter location corrected by 10.7 km (6.6 mi) towards S.

Earthquake details

Date & timeDec 24, 2020 07:51:11 UTC
Local time at epicenterThursday, Dec 24, 2020 at 3:51 am (GMT -4)
Depth10.0 km
Epicenter latitude / longitude17.8404°N / 66.8493°W (Caribbean Sea, Puerto Rico)
Antipode17.84°S / 113.151°E
Shaking intensityWeak shaking
Felt2 reports
Primary data sourceUSGS (United States Geological Survey)
Nearby towns and cities16 km (10 mi) SSE of Guanica (pop: 9,220) | Show on map | Quakes nearby
21 km (13 mi) SSW of Guayanilla (pop: 5,210) | Show on map | Quakes nearby
22 km (13 mi) S of Yauco (pop: 20,300) | Show on map | Quakes nearby
28 km (17 mi) SSW of Penuelas (Peñuelas) (pop: 6,850) | Show on map | Quakes nearby
29 km (18 mi) SSE of Sabana Grande (pop: 8,960) | Show on map | Quakes nearby
30 km (19 mi) SW of Ponce (pop: 152,600) | Show on map | Quakes nearby
96 km (60 mi) SW of Bayamon (pop: 203,500) | Show on map | Quakes nearby
97 km (60 mi) SW of Guaynabo (pop: 81,400) | Show on map | Quakes nearby
102 km (63 mi) SW of Cataño (Catano) (pop: 28,100) | Show on map | Quakes nearby
105 km (65 mi) SW of San Juan (pop: 418,100) | Show on map | Quakes nearby
59 km (36 mi) SW of Puerto Rico Island (pop: 3,474,200) | Show on map | Quakes nearby
Weather at epicenter at time of quakeClear Sky 23.5°C (74 F), humidity: 83%, wind: 2 m/s (4 kts) from ENE
Estimated seismic energy released2.8 x 109 joules (783 kilowatt hours, equivalent to 0.674 tons of TNT) | 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.
3.110 km10 Km S of Indios, Puerto RicoUSGS


Seismic station: Obispado, Ponce (OBIP/PR network) | Distance from quake: 34 km / 21 mi | Show on map | Station Info
Seismic station Obispado, Ponce: 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 (2)

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.
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Utuado in the mountains (46.9 km NNE of epicenter) [Map] / Light shaking (MMI IV) : Was sleeping but I felt it and woke up this has been the 3d one I felt this morning (reported through our app)  
Guanica / Very weak shaking (MMI II) / horizontal (sideways) swinging / 2-5 s : Was laying in bed and woke up to very gentle shaking  

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