QuakeIndex

Earthquake · reviewed by a seismologist

M 2.9md

5 km SW of Adjuntas, Puerto Rico

· 17 km deep · released about 650 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Adjuntas Municipio 5 kmYauco Municipio 11 kmPeñuelas Municipio 13 kmGuayanilla Municipio 15 kmUtuado Municipio 17 kmMaricao Municipio 19 kmLares Municipio 19 kmSabana Grande Municipio 20 kmJayuya 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
Magnitude
M 2.9 (md)
Depth
17 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Adjuntas Municipio, 5 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1513 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 650 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 23,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 16,000× the energy of this one
  3. Around the size people start to feel M 3.0 1.5× the energy of this one
  4. This earthquake M 2.9 about 650 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.

Where

Epicentre 18.1338, -66.7645. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Adjuntas Municipio, PR 5 km (3 mi) S of here earthquakes near Adjuntas Municipio
Yauco Municipio, PR 11 km (7 mi) ENE of here earthquakes near Yauco Municipio
Peñuelas Municipio, PR 13 km (8 mi) NNW of here earthquakes near Peñuelas Municipio
Guayanilla Municipio, PR 15 km (9 mi) NNE of here earthquakes near Guayanilla Municipio
Utuado Municipio, PR 17 km (10 mi) SSW of here earthquakes near Utuado Municipio
Maricao Municipio, PR 19 km (12 mi) ESE of here earthquakes near Maricao Municipio

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

Aftershocks so far

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

  1. 2.0 10 km S of Guánica, Puerto Rico
  2. 2.1 Puerto Rico region
  3. 2.8 2 km WSW of Indios, Puerto Rico
  4. 2.2 Puerto Rico region
  5. 1.9 13 km S of Guánica, Puerto Rico
  6. 2.8 13 km S of Guánica, Puerto Rico
  7. 1.5 5 km SE of Maria Antonia, Puerto Rico
  8. 2.2 4 km SSW of Indios, Puerto Rico
  9. 2.3 6 km NNE of Lluveras, Puerto Rico
  10. 2.1 4 km S of Guánica, Puerto Rico
  11. 2.5 8 km SSE of Tallaboa, Puerto Rico
  12. 2.5 8 km SSE of Maria Antonia, Puerto Rico
  13. 3.1 4 km S of Guánica, Puerto Rico
  14. 2.3 1 km S of Yauco, Puerto Rico
  15. 1.9 0 km NNE of Palomas, 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 180,000 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.