QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6md

Earthquake near Liborio Negron Torres, PR

No earthquake was likely felt in Liborio Negron Torres in the 24 hours to 6:10 am AST (10:10 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 1.6 earthquake was recorded 6 km (4 mi) west-southwest of Liborio Negron Torres, PR, at 3:27 pm AST on 1 October 2019 (19:27 UTC), 9.0 km deep.

USGS: 6 km WSW of Liborio Negron Torres, Puerto Rico

40 km (25 mi) W of Ponce, PR · 26 km (16 mi) SE of Mayagüez, PR

3:27 pm AST, Oct 1, 2019 · · 9.0 km deep · released about 8.7 lb of TNT

Every earthquake near Liborio Negron Torres Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lajas Municipio 6 kmSabana Grande Municipio 9 kmSan Germán Municipio 11 kmGuánica Municipio 11 kmYauco Municipio 17 kmHormigueros Municipio 18 kmMaricao Municipio 19 kmCabo Rojo Municipio 20 kmGuayanilla Municipio 21 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
3:27 pm AST on 1 October 2019 ()
Where
6 km (4 mi) west-southwest of Liborio Negron Torres, PR · earthquakes near Liborio Negron Torres
Magnitude
M 1.6 (md)
Depth
9.0 km below the surface
Felt
no reports yet
Nearest
Lajas Municipio, 6 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2597 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 7 km (4 mi) from the epicentre. In Liborio Negron Torres, 6 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.

Earthquakes near other towns within 30 km: La Parguera, Lajas, Sabana Grande, San Germán, Palmarejo, Fuig.

How big was it?

This earthquake released about 8.7 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.6 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,700,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,200,000× the energy of this one
  3. Around the size people start to feel M 3.0 110× the energy of this one
  4. This earthquake M 1.6 about 8.7 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 4.3 on 2019-09-05 — about 9,800 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 N of this epicentre
  2. 5.2 19 km SW of Stella, Puerto Rico · 44 km WNW of this epicentre
  3. 5.1 21 km SW of Stella, Puerto Rico · 43 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 18.0176, -66.9971. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Lajas Municipio, PR 6 km (4 mi) SW earthquakes near Lajas Municipio
Sabana Grande Municipio, PR 9 km (6 mi) NE earthquakes near Sabana Grande Municipio
San Germán Municipio, PR 11 km (7 mi) NNW earthquakes near San Germán Municipio
Guánica Municipio, PR 11 km (7 mi) SE earthquakes near Guánica Municipio
Yauco Municipio, PR 17 km (10 mi) ENE earthquakes near Yauco Municipio
Hormigueros Municipio, PR 18 km (11 mi) NW earthquakes near Hormigueros Municipio

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

Aftershocks so far

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

  1. 1.6 10 km NW of Coto Laurel, Puerto Rico
  2. 2.2 13 km SSE of Ponce, Puerto Rico
  3. 1.6 11 km ESE of Maricao, Puerto Rico
  4. 1.9 15 km SSW of Potala Pastillo, Puerto Rico
  5. 2.0 8 km S of La Parguera, Puerto Rico
  6. 2.2 12 km SSE of Ponce, Puerto Rico
  7. 2.1 12 km SSW of Potala Pastillo, Puerto Rico
  8. 2.0 15 km S of Tallaboa, Puerto Rico
  9. 2.1 12 km SSE of Ponce, Puerto Rico
  10. 2.2 12 km SSE of Ponce, Puerto Rico
  11. 1.6 0 km NW of Cabo Rojo, Puerto Rico
  12. 1.7 3 km WNW of Pole Ojea, Puerto Rico
  13. 1.8 12 km SSE of Ponce, Puerto Rico
  14. 1.7 1 km S of Liborio Negron Torres, Puerto Rico
  15. 1.9 4 km WNW 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.