QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1md

10 km S of Guánica, Puerto Rico

· 13 km deep · released about 1,200 lb of TNT

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10 km30 km60 km120 km N Guánica Municipio 8 kmLajas Municipio 17 kmGuayanilla Municipio 19 kmSabana Grande Municipio 23 kmYauco Municipio 24 kmPeñuelas Municipio 26 kmSan Germán Municipio 28 kmCabo Rojo Municipio 30 kmMaricao Municipio 33 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
Magnitude
M 3.1 (md)
Depth
13 km below the surface
Felt
1 report · strongest reported intensity III
Nearest
Guánica Municipio, 8 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 853 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 1 person has reported feeling it to USGS.

How big was it?

This earthquake released about 1,200 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.1 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 290,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 13,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 9,100× the energy of this one
  4. This earthquake M 3.1 about 1,200 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.2× 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.

Where

Epicentre 17.8777, -66.9232. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Guánica Municipio, PR 8 km (5 mi) S of here earthquakes near Guánica Municipio
Lajas Municipio, PR 17 km (10 mi) SE of here earthquakes near Lajas Municipio
Guayanilla Municipio, PR 19 km (12 mi) SW of here earthquakes near Guayanilla Municipio
Sabana Grande Municipio, PR 23 km (14 mi) S of here earthquakes near Sabana Grande Municipio
Yauco Municipio, PR 24 km (15 mi) SSW of here earthquakes near Yauco Municipio
Peñuelas Municipio, PR 26 km (16 mi) SW of here 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. 1.6 4 km E of La Parguera, Puerto Rico
  2. 2.4 15 km SSE of Guánica, Puerto Rico
  3. 2.4 2 km NNW of Indios, Puerto Rico
  4. 2.3 6 km SSE of Maria Antonia, Puerto Rico
  5. 3.1 5 km WSW of Guánica, Puerto Rico
  6. 2.1 3 km NW of Fuig, Puerto Rico
  7. 2.5 1 km SW of Indios, Puerto Rico
  8. 2.2 6 km SW of La Parguera, Puerto Rico
  9. 2.0 2 km N of Indios, Puerto Rico
  10. 3.1 8 km SSW of La Playa, Puerto Rico
  11. 2.5 2 km SSW of Peñuelas, Puerto Rico
  12. 3.1 3 km WSW of Indios, Puerto Rico
  13. 3.0 8 km SSW of Guánica, Puerto Rico
  14. 3.0 6 km SSE of Maria Antonia, Puerto Rico
  15. 2.2 10 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.

For this area

The largest earthquake within 50 km in our catalogue was M 6.4 on 2020-01-07 — it released about 100,000 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.