Moderate mag. 4.2 earthquake - Tallaboa Poniente Barrio, Peñuelas, 12 km west of Ponce, Puerto Rico, on 31 May 1:18 am (GMT -4) -

Moderate mag. 4.2 earthquake - Tallaboa Poniente Barrio, Peñuelas, 12 km west of Ponce, Puerto Rico, on 31 May 1:18 am (GMT -4)

Moderate magnitude 4.2 earthquake at 15 km depth

31 May 05:22 UTC: First to report: VolcanoDiscovery after 3 minutes.
31 May 05:39: Now using data updates from USGS
31 May 06:52: Hypocenter depth recalculated from 19.4 to 15.0 km (from 12.1 to 9.3 mi). Epicenter location corrected by 1.1 km (0.7 mi) towards NNW.
Update Mon, 31 May 2021, 05:45
Moderate earthquake of magnitude 4.2 just reported 12 km west of Ponce, Puerto Rico
4.2 quake 31 May 1:18 am (GMT -4)
4.2 quake 31 May 1:18 am (GMT -4)
An earthquake of magnitude 4.2 occurred only 26 minutes ago 12 km west of Ponce, Puerto Rico, the United States Geological Survey reported.
The quake hit at a shallow depth of 19.4 km beneath the epicenter near Ponce, Segundo Barrio, Puerto Rico, early morning on Monday 31 May 2021 at 1:18 am 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.
A second report was later issued by the European-Mediterranean Seismological Centre (EMSC), which listed it as a magnitude 4.2 earthquake as well.
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 Tallaboa (pop. 1,200) located 3 km from the epicenter, Guayanilla (pop. 5,200) 6 km away, Peñuelas (pop. 6,800) 6 km away, Ponce (pop. 152,600) 12 km away, Yauco (pop. 20,300) 12 km away, Adjuntas (pop. 5,100) 18 km away, Guanica (pop. 9,200) 18 km away, Sabana Grande (pop. 9,000) 25 km away, Juana Diaz (pop. 9,400) 25 km away, Jayuya (pop. 3,600) 28 km away, Utuado (pop. 9,800) 29 km away, and Villalba (pop. 4,600) 29 km away.
Other towns or cities near the epicenter where the quake might have been felt as very weak shaking include Bayamon (pop. 203,500) located 75 km from the epicenter, and Puerto Rico (pop. 418,100) 84 km away.
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Earthquake data

Date & time: May 31, 2021 05:18:39 UTC -
Local time at epicenter: 31 May 1:18 am (GMT -4)
Magnitude: 4.2
Depth: 15.0 km
Epicenter latitude / longitude: 18.0155°N / 66.741°W (Tallaboa Poniente Barrio, Peñuelas, Puerto Rico)
Antipode: 18.016°S / 113.259°E
Nearby towns and cities:
3 km (2 mi) E of Magas Arriba (Guayanilla) (pop: 1,060) --> See nearby quakes!
5 km (3 mi) SSW of Penuelas (Peñuelas) (pop: 6,850) --> See nearby quakes!
5 km (3 mi) E of Guayanilla (pop: 5,210) --> See nearby quakes!
12 km (7 mi) E of Yauco (pop: 20,300) --> See nearby quakes!
12 km (8 mi) W of Ponce (pop: 152,600) --> See nearby quakes!
16 km (10 mi) S of Adjuntas (pop: 5,080) --> See nearby quakes!
18 km (11 mi) ENE of Guanica (Guánica) (pop: 9,220) --> See nearby quakes!
24 km (15 mi) ESE of Sabana Grande (pop: 8,960) --> See nearby quakes!
25 km (16 mi) W of Juana Diaz (Juana Díaz) (pop: 9,430) --> See nearby quakes!
28 km (17 mi) SW of Jayuya (pop: 3,590) --> See nearby quakes!
28 km (17 mi) S of Utuado (pop: 9,840) --> See nearby quakes!
29 km (18 mi) WSW of Villalba (pop: 4,560) --> See nearby quakes!
75 km (47 mi) SW of Bayamon (Bayamón) (pop: 203,500) --> See nearby quakes!
84 km (52 mi) SW of San Juan (pop: 418,100) --> See nearby quakes!
Weather at epicenter at time of quake:
Clear Sky 24°C (75 F), humidity: 80%, wind: 2 m/s (4 kts) from NNE
Primary data source: USGS (United States Geological Survey)
Estimated released energy: 1.3 x 1011 joules (35 megawatt hours, equivalent to 30.1 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
4.215 kmNear Arecibo, Arecibo, Puerto RicoUSGS
4.215 kmPUERTO RICOEMSC

User reports for this quake (21)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
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Bo marueño Ponce / Very weak shaking (MMI II) : Un ruido fuerte. como un trueno | One user found this interesting.  
Sherry. In the mountains utuado (24.6 km NNE of epicenter) [Map] / Moderate shaking (MMI V) : Shook my house real good | One user found this interesting. (reported through our app)  
Ponce / Weak shaking (MMI III) / horizontal (sideways) swinging / 5-10 s : I felt my bed shaking lightly and a soft vibration. The lamp (hanging) swings a little bit | One user found this interesting.  
Adjuntas (14.5 km N of epicenter) [Map] / Light shaking (MMI IV) / rattling, vibrating / 2-5 s
Coamo Puerto Rico (38.5 km E of epicenter) [Map] / Light shaking (MMI IV) / rattling, vibrating / 5-10 s
Ciales, Ciales Barrio-Pueblo (44.9 km NE of epicenter) [Map] / Weak shaking (MMI III) / vertical swinging (up and down) / 1-2 s : abrupt up and down movements  
Adjuntas PR (16.5 km N of epicenter) [Map] / Weak shaking (MMI III) / rattling, vibrating
Boqueron, Cabo Rojo (40.8 km W of epicenter) [Map] / Very weak shaking (MMI II) / 2-5 s
Añasco, PR / Light shaking (MMI IV) / horizontal (sideways) swinging / 5-10 s : House shook  
Ponce / Light shaking (MMI IV) / single lateral shake / 5-10 s
adjuntas (11 km N of epicenter) [Map] / Light shaking (MMI IV) / very short : un movimiento en mi habitación  
Frailes Yauco PR / Weak shaking (MMI III) / rattling, vibrating : I was sleeping and the shaking of the bed woke me up.  
Magueyes (22 km NE of epicenter) [Map] / Weak shaking (MMI III) / 2-5 s (reported through our app)
Adjuntas / Light shaking (MMI IV) / vibration and rolling / 2-5 s
Coamo Puerto Rico / Light shaking (MMI IV) / 5-10 s
Adjuntas / Weak shaking (MMI III) / rattling, vibrating / 2-5 s
Adjuntas / Weak shaking (MMI III) / rattling, vibrating / 2-5 s
Penuelas PR / Very weak shaking (MMI II) / single lateral shake / 2-5 s
Naranjito (54.5 km NNE of epicenter) [Map] / Very weak shaking (MMI II) / rattling, vibrating / 5-10 s
Ponce / Light shaking (MMI IV) / rattling, vibrating / 2-5 s
00674 (53.8 km NNE of epicenter) [Map] / Very weak shaking (MMI II) / 2-5 s
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