QuakeIndex

Earthquake · reviewed by a seismologist

M 4.2mb

Earthquake near Tallaboa, PR

No earthquake was likely felt in Tallaboa in the 24 hours to 5:29 pm AST (21:29 UTC). The last one was M 2.1, 9 km (5 mi) WNW, at 4:39 pm AST on 9 November 2026, estimated intensity II (weak) in town. Every earthquake near Tallaboa

This page: a magnitude 4.2 earthquake was recorded 13 km (8 mi) south-southwest of Tallaboa, PR, at 12:47 pm AST on 31 May 2020 (16:47 UTC), 10 km deep. 10 people have reported feeling it to USGS.

USGS: 13 km SSW of Tallaboa, Puerto Rico

18 km (11 mi) SW of Ponce, PR

12:47 pm AST, May 31, 2020 · · 10 km deep · released about 30 tons of TNT

Every earthquake near Tallaboa Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Guayanilla Municipio 15 kmPeñuelas Municipio 16 kmPonce Municipio 20 kmGuánica Municipio 21 kmYauco Municipio 26 kmJuana Díaz Municipio 30 kmSabana Grande Municipio 32 kmLajas Municipio 34 kmAdjuntas Municipio 34 km
Distance rings around the epicentre, with the nearest towns at their true direction and later quakes as coloured dots. Not a shaking map — see the USGS ShakeMap for that.
When
12:47 pm AST on 31 May 2020 ()
Where
13 km (8 mi) south-southwest of Tallaboa, PR · earthquakes near Tallaboa
Magnitude
M 4.2 (mb)
Depth
10 km below the surface
Felt
10 reports · strongest reported intensity IV
Measured shaking
intensity III (ShakeMap)
USGS impact alert
green
Nearest
Guayanilla Municipio, 15 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2279 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon.

At this magnitude and depth, people at rest would likely notice it out to about 112 km (70 mi) from the epicentre. In Tallaboa, 13 km away, the estimate is intensity IV (light). Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.

Likely felt in: Tallaboa 13 km, intensity IV · Magas Arriba 16 km, intensity III · Guayanilla 16 km, intensity III · Ponce 19 km, intensity III · Tallaboa Alta 20 km, intensity III · Yauco 21 km, intensity III · Adjuntas 32 km, intensity III · Río Cañas Abajo 34 km, intensity III. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 30 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.2 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 5,600× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 250× the energy of this one
  3. Magna, Utah 2020 M 5.7 180× the energy of this one
  4. This earthquake M 4.2 about 30 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 63× more

Energy from the Gutenberg–Richter relation (log10E = 1.5M + 4.8), rounded to two figures; bar length is magnitude, which is already a logarithm of energy. Magnitudes of past earthquakes from the USGS catalogue.

For this area

The largest earthquake within 50 km since 2016 was M 6.4 on 2020-01-07 — about 2,000 times the energy of this one.

Before 2016, the USGS record since 1900 lists no earthquake of M5 or more within 50 km.

Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.

Where

Epicentre 17.8789, -66.7408. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Guayanilla Municipio, PR 15 km (10 mi) NNW earthquakes near Guayanilla Municipio
Peñuelas Municipio, PR 16 km (10 mi) N earthquakes near Peñuelas Municipio
Ponce Municipio, PR 20 km (12 mi) NE earthquakes near Ponce Municipio
Guánica Municipio, PR 21 km (13 mi) WNW earthquakes near Guánica Municipio
Yauco Municipio, PR 26 km (16 mi) NNW earthquakes near Yauco Municipio
Juana Díaz Municipio, PR 30 km (18 mi) ENE earthquakes near Juana Díaz Municipio

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

60 earthquakes have been recorded within 50 km since this one.

  1. 2.8 2 km SW of Indios, Puerto Rico
  2. 1.8 2 km SW of Indios, Puerto Rico
  3. 2.4 7 km S of Guánica, Puerto Rico
  4. 2.2 5 km SE of La Parguera, Puerto Rico
  5. 2.8 2 km NW of Indios, Puerto Rico
  6. 2.4 7 km ESE of La Parguera, Puerto Rico
  7. 2.2 2 km NNW of Tallaboa, Puerto Rico
  8. 2.4 6 km SSE of Maria Antonia, Puerto Rico
  9. 2.6 5 km WSW of Guánica, Puerto Rico
  10. 2.3 14 km S of Guánica, Puerto Rico
  11. 1.8 1 km WSW of Indios, Puerto Rico
  12. 2.4 4 km SE of La Parguera, Puerto Rico
  13. 2.1 9 km SSW of Tallaboa, Puerto Rico
  14. 3.3 4 km WSW of Guánica, Puerto Rico
  15. 2.8 3 km SSE of Maria Antonia, Puerto Rico

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of . QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.