QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9md

Earthquake near Guánica, PR

Yes: an earthquake was likely felt in Guánica in the last 24 hours. M 2.1, 7 km (4 mi) ENE of Guánica, at 4:14 pm AST on 11 November 2026 (20:14 UTC); the estimated shaking in Guánica was intensity II (weak). Every earthquake near Guánica

This page: a magnitude 1.9 earthquake was recorded in Guánica, PR, at 12:08 pm AST on 8 January 2021 (16:08 UTC), 12 km deep.

USGS: 1 km S of Guánica, Puerto Rico

30 km (19 mi) W of Ponce, PR

12:08 pm AST, Jan 8, 2021 · · 12 km deep · released about 18 lb of TNT

Every earthquake near Guánica Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Guánica Municipio 2 kmGuayanilla Municipio 13 kmLajas Municipio 14 kmSabana Grande Municipio 15 kmYauco Municipio 15 kmPeñuelas Municipio 20 kmSan Germán Municipio 22 kmMaricao Municipio 24 kmAdjuntas Municipio 29 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
12:08 pm AST on 8 January 2021 ()
Where
in Guánica, PR · earthquakes near Guánica
Magnitude
M 1.9 (md)
Depth
12 km below the surface
Felt
no reports yet
Nearest
Guánica Municipio, 2 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2055 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. 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: Maria Antonia, Fuig, Palomas, Lluveras, Indios, Liborio Negron Torres.

How big was it?

This earthquake released about 18 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 840,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 600,000× the energy of this one
  3. Around the size people start to feel M 3.0 53× the energy of this one
  4. This earthquake M 1.9 about 18 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 6,700,000 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 17.9566, -66.9051. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Guánica Municipio, PR 2 km (1 mi) WSW earthquakes near Guánica Municipio
Guayanilla Municipio, PR 13 km (8 mi) ENE earthquakes near Guayanilla Municipio
Lajas Municipio, PR 14 km (9 mi) W earthquakes near Lajas Municipio
Sabana Grande Municipio, PR 15 km (9 mi) NNW earthquakes near Sabana Grande Municipio
Yauco Municipio, PR 15 km (9 mi) NNE earthquakes near Yauco Municipio
Peñuelas Municipio, PR 20 km (13 mi) ENE earthquakes near Peñuelas 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. 1.6 3 km SE of Maria Antonia, Puerto Rico
  2. 1.7 2 km S of Guánica, Puerto Rico
  3. 2.0 6 km SSW of Indios, Puerto Rico
  4. 2.0 6 km SSE of Maria Antonia, Puerto Rico
  5. 2.2 1 km S of Sabana Grande, Puerto Rico
  6. 2.0 2 km NNW of Maria Antonia, Puerto Rico
  7. 1.6 3 km S of La Parguera, Puerto Rico
  8. 1.9 6 km SE of Maria Antonia, Puerto Rico
  9. 2.0 6 km SE of Maria Antonia, Puerto Rico
  10. 1.7 13 km S of La Parguera, Puerto Rico
  11. 1.7 11 km S of Guánica, Puerto Rico
  12. 1.9 7 km SSE of Maria Antonia, Puerto Rico
  13. 1.6 4 km SW of Guánica, Puerto Rico
  14. 1.8 2 km W of Guánica, Puerto Rico
  15. 2.1 7 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.