QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8md

8 km SSW of Lares, Puerto Rico

· 21 km deep · released about 430 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lares Municipio 7 kmMaricao Municipio 7 kmLas Marías Municipio 8 kmSan Sebastián Municipio 14 kmAdjuntas Municipio 16 kmYauco Municipio 16 kmSabana Grande Municipio 16 kmSan Germán Municipio 19 kmUtuado Municipio 22 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 2.8 (md)
Depth
21 km below the surface
Felt
3 reports · strongest reported intensity II
Nearest
Lares Municipio, 7 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 836 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 3 people have reported feeling it to USGS.

How big was it?

This earthquake released about 430 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 35,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 25,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.2× the energy of this one
  4. This earthquake M 2.8 about 430 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 18.2262, -66.9033. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lares Municipio, PR 7 km (4 mi) SSW of here earthquakes near Lares Municipio
Maricao Municipio, PR 7 km (4 mi) NNE of here earthquakes near Maricao Municipio
Las Marías Municipio, PR 8 km (5 mi) E of here earthquakes near Las Marías Municipio
San Sebastián Municipio, PR 14 km (8 mi) SSE of here earthquakes near San Sebastián Municipio
Adjuntas Municipio, PR 16 km (10 mi) WNW of here earthquakes near Adjuntas Municipio
Yauco Municipio, PR 16 km (10 mi) NNW of here earthquakes near Yauco Municipio

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

Aftershocks so far

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

  1. 2.9 17 km N of Arecibo, Puerto Rico
  2. 2.0 6 km SSE of Maria Antonia, Puerto Rico
  3. 1.7 9 km SSW of Guánica, Puerto Rico
  4. 1.6 3 km SSE of Palomas, Puerto Rico
  5. 2.3 6 km ESE of La Parguera, Puerto Rico
  6. 3.3 15 km SSW of Stella, Puerto Rico
  7. 3.8 9 km SW of Stella, Puerto Rico
  8. 2.3 5 km SE of Maricao, Puerto Rico
  9. 2.4 3 km E of Magas Arriba, Puerto Rico
  10. 2.6 7 km SE of Maria Antonia, Puerto Rico
  11. 1.9 11 km SSE of Maria Antonia, Puerto Rico
  12. 1.9 6 km WSW of Fuig, Puerto Rico
  13. 2.0 4 km NNW of Guayanilla, Puerto Rico
  14. 2.3 7 km SW of Guánica, Puerto Rico
  15. 2.4 4 km SSW of Indios, 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 280,000 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.