QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

Earthquake near Liborio Negron Torres, PR

No earthquake was likely felt in Liborio Negron Torres in the 24 hours to 12:54 pm AST (16:54 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 1.8 earthquake was recorded 2 km (1 mi) south-southeast of Liborio Negron Torres, PR, at 11:40 am AST on 18 September 2026 (15:40 UTC), 4.3 km deep.

USGS: 2 km SSE of Liborio Negron Torres, Puerto Rico

33 km (21 mi) W of Ponce, PR · 29 km (18 mi) SE of Mayagüez, PR

11:40 am AST, Sep 18, 2026 · · 4.3 km deep · released about 16 lb of TNT

Every earthquake near Liborio Negron Torres Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Sabana Grande Municipio 7 kmGuánica Municipio 9 kmYauco Municipio 11 kmLajas Municipio 12 kmSan Germán Municipio 14 kmGuayanilla Municipio 15 kmMaricao Municipio 16 kmPeñuelas Municipio 22 kmHormigueros Municipio 23 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
11:40 am AST on 18 September 2026 ()
Where
2 km (1 mi) south-southeast of Liborio Negron Torres, PR · earthquakes near Liborio Negron Torres
Magnitude
M 1.8 (md)
Depth
4.3 km below the surface
Felt
no reports yet
Nearest
Sabana Grande Municipio, 7 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 48 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

At this magnitude and depth, people at rest would likely notice it out to about 13 km (8 mi) from the epicentre. In Liborio Negron Torres, 2 km away, the estimate is intensity II (weak). 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 9 km, intensity II · San Germán 13 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 16 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 930,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 660,000× the energy of this one
  3. Around the size people start to feel M 3.0 59× the energy of this one
  4. This earthquake M 1.8 about 16 lb of TNT

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 7,400,000 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 · 44 km NNW of this epicentre
  2. 5.2 19 km SW of Stella, Puerto Rico · 49 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 18.0257, -66.9357. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Sabana Grande Municipio, PR 7 km (4 mi) N earthquakes near Sabana Grande Municipio
Guánica Municipio, PR 9 km (5 mi) S earthquakes near Guánica Municipio
Yauco Municipio, PR 11 km (7 mi) NE earthquakes near Yauco Municipio
Lajas Municipio, PR 12 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 15 km (9 mi) E earthquakes near Guayanilla 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. 2.0 7 km SSW of Guánica, Puerto Rico
  2. 1.8 3 km SW of Guánica, Puerto Rico
  3. 2.3 4 km WSW of Fuig, Puerto Rico
  4. 1.8 1 km NE of Boquerón, Puerto Rico
  5. 2.2 1 km WNW of Aguilita, Puerto Rico
  6. 1.5 0 km NNE of Maria Antonia, Puerto Rico
  7. 1.9 4 km SW of Guánica, Puerto Rico
  8. 2.3 0 km SW of Indios, Puerto Rico
  9. 1.7 4 km SW of Fuig, Puerto Rico
  10. 2.4 4 km WSW of Fuig, Puerto Rico
  11. 1.8 18 km S of Guánica, Puerto Rico
  12. 1.9 3 km WSW of Fuig, Puerto Rico
  13. 1.9 3 km SW of Guánica, Puerto Rico
  14. 3.0 4 km WSW of Guánica, Puerto Rico
  15. 2.7 4 km WSW of Fuig, 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.