QuakeIndex

Earthquake · reviewed by a seismologist

M 3.6md

Earthquake near Liborio Negron Torres, PR

No earthquake was likely felt in Liborio Negron Torres in the 24 hours to 3:23 pm AST (19:23 UTC). The last one was M 3.0, 17 km (11 mi) SE, at 3:45 am AST on 8 November 2026, estimated intensity II (weak) in town. Every earthquake near Liborio Negron Torres

This page: a magnitude 3.6 earthquake was recorded in Liborio Negron Torres, PR, at 1:41 pm AST on 13 May 2023 (17:41 UTC), 9.0 km deep. 4 people have reported feeling it to USGS.

USGS: 1 km ESE of Liborio Negron Torres, Puerto Rico

32 km (20 mi) W of Ponce, PR · 29 km (18 mi) SE of Mayagüez, PR

1:41 pm AST, May 13, 2023 · · 9.0 km deep · released about 3.4 tons of TNT

Every earthquake near Liborio Negron Torres Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Sabana Grande Municipio 6 kmYauco Municipio 9 kmGuánica Municipio 10 kmLajas Municipio 14 kmSan Germán Municipio 14 kmGuayanilla Municipio 14 kmMaricao Municipio 15 kmPeñuelas Municipio 21 kmLas Marías Municipio 22 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
1:41 pm AST on 13 May 2023 ()
Where
in Liborio Negron Torres, PR · earthquakes near Liborio Negron Torres
Magnitude
M 3.6 (md)
Depth
9.0 km below the surface
Felt
4 reports · strongest reported intensity IV
Nearest
Sabana Grande Municipio, 6 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1208 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

At this magnitude and depth, people at rest would likely notice it out to about 67 km (42 mi) from the epicentre. 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: Yauco 8 km, intensity III · San Germán 13 km, intensity III · Guayanilla 15 km, intensity III · Magas Arriba 17 km, intensity III · Tallaboa 23 km, intensity III · Tallaboa Alta 24 km, intensity III · Adjuntas 26 km, intensity III · Puerto Real 28 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 3.4 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.6 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 50,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 2,200× the energy of this one
  3. Magna, Utah 2020 M 5.7 1,600× the energy of this one
  4. This earthquake M 3.6 about 3.4 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 7.2× 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 18,000 times the energy of this one.

Before 2016, the USGS record lists 3 earthquakes of M5 or more within 50 km:

  1. 5.8 4 km E of Moca, Puerto Rico · 43 km NNW of this epicentre
  2. 5.2 19 km SW of Stella, Puerto Rico · 50 km WNW of this epicentre
  3. 5.1 21 km SW of Stella, Puerto Rico · 49 km WNW of this epicentre

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 18.0375, -66.9278. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Sabana Grande Municipio, PR 6 km (3 mi) NNW earthquakes near Sabana Grande Municipio
Yauco Municipio, PR 9 km (6 mi) NE earthquakes near Yauco Municipio
Guánica Municipio, PR 10 km (6 mi) S earthquakes near Guánica Municipio
Lajas Municipio, PR 14 km (8 mi) WSW earthquakes near Lajas Municipio
San Germán Municipio, PR 14 km (9 mi) NW earthquakes near San Germán Municipio
Guayanilla Municipio, PR 14 km (9 mi) ESE earthquakes near Guayanilla Municipio

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

Aftershocks so far

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

  1. 2.2 5 km WSW of Gu?nica, Puerto Rico
  2. 2.2 7 km SW of Tallaboa, Puerto Rico
  3. 2.1 5 km SSW of Indios, Puerto Rico
  4. 2.4 3 km WSW of Fuig, Puerto Rico
  5. 2.3 4 km WSW of Guánica, Puerto Rico
  6. 2.4 1 km NE of Indios, Puerto Rico
  7. 2.4 Puerto Rico region
  8. 2.4 4 km E of La Parguera, Puerto Rico
  9. 2.1 1 km ENE of Indios, Puerto Rico
  10. 2.4 1 km NW of Guayanilla, Puerto Rico
  11. 2.1 9 km SSE of Indios, Puerto Rico
  12. 1.8 1 km NW of Sabana Grande, Puerto Rico
  13. 2.0 1 km E of Indios, Puerto Rico
  14. 2.2 2 km SE of Indios, Puerto Rico
  15. 2.4 6 km SW of Guánica, 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.