Moderate mag. 3.9 earthquake - Caribbean Sea, 40 km west of Ponce, Segundo Barrio, Ponce, Puerto Rico, on 12 May 4:23 pm (GMT -4) -

Moderate mag. 3.9 earthquake - Caribbean Sea, 40 km west of Ponce, Segundo Barrio, Ponce, Puerto Rico, on 12 May 4:23 pm (GMT -4)

Moderate magnitude 3.9 earthquake at 10 km depth

12 May 20:26 UTC: First to report: VolcanoDiscovery after 4 minutes.
12 May 20:31: Now using data updates from EMSC
Date & time: May 12, 2021 20:23:00 UTC -
Local time at epicenter: 12 May 4:23 pm (GMT -4)
Magnitude: 3.9
Depth: 10.0 km
Epicenter latitude / longitude: 17.91°N / 66.99°W (Caribbean Sea, Puerto Rico)
Antipode: 17.91°S / 113.01°E
Nearby towns and cities:
9 km (6 mi) SE of La Parguera (pop: 1,140) --> See nearby quakes!
11 km (7 mi) SW of Guanica (pop: 9,220) --> See nearby quakes!
17 km (11 mi) SSE of Lajas (pop: 5,260) --> See nearby quakes!
19 km (12 mi) S of Sabana Grande (pop: 8,960) --> See nearby quakes!
20 km (12 mi) SSE of San German (San Germán) (pop: 12,100) --> See nearby quakes!
20 km (13 mi) SW of Yauco (pop: 20,300) --> See nearby quakes!
24 km (15 mi) WSW of Guayanilla (pop: 5,210) --> See nearby quakes!
26 km (16 mi) SE of Cabo Rojo (pop: 10,800) --> See nearby quakes!
29 km (18 mi) SSE of Hormigueros (pop: 11,900) --> See nearby quakes!
40 km (25 mi) WSW of Ponce (pop: 152,600) --> See nearby quakes!
81 km (50 mi) WSW of Aibonito (pop: 8,950) --> See nearby quakes!
104 km (64 mi) WSW of Bayamon (pop: 203,500) --> See nearby quakes!
109 km (68 mi) WSW of Cataño (Catano) (pop: 28,100) --> See nearby quakes!
112 km (70 mi) SW of San Juan (pop: 418,100) --> See nearby quakes!
64 km (40 mi) SW of Puerto Rico Island (pop: 3,474,200) --> See nearby quakes!
Weather at epicenter at time of quake:
Overcast Clouds 28.1°C (83 F), humidity: 78%, wind: 6 m/s (12 kts) from SSE
Primary data source: EMSC (European-Mediterranean Seismological Centre)
Estimated released energy: 4.5 x 1010 joules (12.4 megawatt hours, equivalent to 10.7 tons of TNT) More info
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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
3.910 kmNear Mayagüez, Mayagüez, Puerto RicoEMSC
3.89 km5 Km SE of La Parguera, Puerto RicoUSGS

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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Barrio Frailes. Yauco PR / Light shaking (MMI IV) / 2-5 s : I thought a heavy truck was coming down the hill on the road from above our house, but there was no truck. We were out on the concrete patio and could feel the vibration.  
Cabo Rojo, Puerto Rico (26.5 km NW of epicenter) [Map] / Moderate shaking (MMI V) / rattling, vibrating / 2-5 s (reported through our app)
Maria Antonia, Carenero Barrio, Guánica (12.7 km ENE of epicenter) [Map] / Very weak shaking (MMI II) / horizontal (sideways) swinging / 1-2 s
Lares Puerto Rico (35.6 km N of epicenter) [Map] / Light shaking (MMI IV) / single lateral shake / 2-5 s : Estaba en mi silla mecedora y lo sentí (reported through our app)  
Hormigueros (26.4 km NNW of epicenter) [Map] / Light shaking (MMI IV) / rattling, vibrating / 5-10 s : Light shaking.  
Puerto rico (42.2 km NNW of epicenter) [Map] / Very weak shaking (MMI II) : Very fqint but I felt something I hope that wasnt a fart  
San German / Weak shaking (MMI III) / rattling, vibrating / 1-2 s : Glad windows in the store  
San German / Weak shaking (MMI III) / rattling, vibrating / 1-2 s : Glad windows in the store  
Naples Fl / Weak shaking (MMI III) / rattling, vibrating / 5-10 s : Sitting at table. Felt whole house, and my gut vibrating.  
Mayagüez pr / Weak shaking (MMI III) / 1-2 s
Mayaguez / Very weak shaking (MMI II) / single vertical bump / very short
San German / not felt
mayaguez / Light shaking (MMI IV) / rattling, vibrating
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