QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7md

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 1.7 earthquake was recorded 17 km (11 mi) south of Guánica, PR, at 12:42 pm AST on 7 January 2021 (16:42 UTC), 16 km deep.

USGS: 17 km S of Guánica, Puerto Rico

38 km (24 mi) WSW of Ponce, PR

12:42 pm AST, Jan 7, 2021 · · 16 km deep · released about 11 lb of TNT

Every earthquake near Guánica Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Guánica Municipio 14 kmLajas Municipio 21 kmGuayanilla Municipio 25 kmSabana Grande Municipio 30 kmYauco Municipio 31 kmPeñuelas Municipio 31 kmCabo Rojo Municipio 33 kmSan Germán Municipio 34 kmPonce Municipio 40 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
12:42 pm AST on 7 January 2021 ()
Where
17 km (11 mi) south of Guánica, PR · earthquakes near Guánica
Magnitude
M 1.7 (md)
Depth
16 km below the surface
Felt
no reports yet
Nearest
Guánica Municipio, 14 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2067 days ago

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

At this magnitude and depth it was probably too small to be felt, even directly above it. In Guánica, 17 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: Maria Antonia, Fuig, La Parguera, Palomas, Indios, Lluveras.

How big was it?

This earthquake released about 11 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,400,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 970,000× the energy of this one
  3. Around the size people start to feel M 3.0 86× the energy of this one
  4. This earthquake M 1.7 about 11 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 11,000,000 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 17.8183, -66.9270. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Guánica Municipio, PR 14 km (9 mi) N earthquakes near Guánica Municipio
Lajas Municipio, PR 21 km (13 mi) NW earthquakes near Lajas Municipio
Guayanilla Municipio, PR 25 km (15 mi) NNE earthquakes near Guayanilla Municipio
Sabana Grande Municipio, PR 30 km (18 mi) N earthquakes near Sabana Grande Municipio
Yauco Municipio, PR 31 km (19 mi) NNE earthquakes near Yauco Municipio
Peñuelas Municipio, PR 31 km (19 mi) NE earthquakes near Peñuelas Municipio

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

Aftershocks so far

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

  1. 1.7 4 km SW of Liborio Negron Torres, Puerto Rico
  2. 1.5 1 km WSW of Guánica, Puerto Rico
  3. 2.2 4 km SSE of Guánica, Puerto Rico
  4. 1.9 7 km WSW of La Parguera, Puerto Rico
  5. 2.6 6 km WSW of Fuig, Puerto Rico
  6. 2.3 12 km SSE of Guánica, Puerto Rico
  7. 1.7 6 km ESE of La Parguera, Puerto Rico
  8. 1.7 4 km SE of Maria Antonia, Puerto Rico
  9. 1.6 5 km ESE of Maria Antonia, Puerto Rico
  10. 1.8 6 km SE of Maria Antonia, Puerto Rico
  11. 1.8 4 km WSW of Guánica, Puerto Rico
  12. 1.9 2 km SW of Guánica, Puerto Rico
  13. 1.8 5 km SSW of Indios, Puerto Rico
  14. 1.8 4 km SSE of Guánica, Puerto Rico
  15. 1.9 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.