QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1md

0 km NNE of Guánica, Puerto Rico

· 9.7 km deep · released about 1,400 lb of TNT

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10 km30 km60 km120 km N Guánica Municipio 4 kmGuayanilla Municipio 12 kmSabana Grande Municipio 13 kmYauco Municipio 13 kmLajas Municipio 14 kmPeñuelas Municipio 20 kmSan Germán Municipio 20 kmMaricao Municipio 22 kmAdjuntas Municipio 28 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
9.7 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Guánica Municipio, 4 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 475 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 1,400 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 6.7 240,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 11,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 7,700× the energy of this one
  4. This earthquake M 3.1 about 1,400 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.5× 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 17.9773, -66.9065. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Guánica Municipio, PR 4 km (2 mi) NNE of here earthquakes near Guánica Municipio
Guayanilla Municipio, PR 12 km (7 mi) WSW of here earthquakes near Guayanilla Municipio
Sabana Grande Municipio, PR 13 km (8 mi) SSE of here earthquakes near Sabana Grande Municipio
Yauco Municipio, PR 13 km (8 mi) SSW of here earthquakes near Yauco Municipio
Lajas Municipio, PR 14 km (9 mi) E of here earthquakes near Lajas Municipio
Peñuelas Municipio, PR 20 km (12 mi) WSW 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. 2.2 0 km WSW of Indios, Puerto Rico
  2. 2.3 1 km SSE of Indios, Puerto Rico
  3. 2.7 1 km SE of Indios, Puerto Rico
  4. 2.0 1 km SW of Indios, Puerto Rico
  5. 2.0 6 km SSW of La Parguera, Puerto Rico
  6. 2.4 5 km SSW of Indios, Puerto Rico
  7. 2.2 4 km SW of Indios, Puerto Rico
  8. 2.1 2 km SW of Tallaboa, Puerto Rico
  9. 2.3 7 km SSE of Guánica, Puerto Rico
  10. 2.4 0 km SSW of Indios, Puerto Rico
  11. 2.0 3 km S of Indios, Puerto Rico
  12. 2.9 1 km SE of Indios, Puerto Rico
  13. 2.1 2 km SSE of Indios, Puerto Rico
  14. 2.9 5 km W of Maricao, Puerto Rico
  15. 2.3 7 km S of Magas Arriba, 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 86,000 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.