QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8md

2 km SSW of Adjuntas, Puerto Rico

· 20 km deep · released about 400 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Adjuntas Municipio 5 kmPeñuelas Municipio 13 kmUtuado Municipio 14 kmYauco Municipio 15 kmJayuya Municipio 17 kmGuayanilla Municipio 17 kmPonce Municipio 20 kmLares Municipio 21 kmMaricao 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
20 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Adjuntas Municipio, 5 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 983 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 400 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 38,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 27,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.4× the energy of this one
  4. This earthquake M 2.8 about 400 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 18.1437, -66.7268. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Adjuntas Municipio, PR 5 km (3 mi) SE of here earthquakes near Adjuntas Municipio
Peñuelas Municipio, PR 13 km (8 mi) N of here earthquakes near Peñuelas Municipio
Utuado Municipio, PR 14 km (9 mi) S of here earthquakes near Utuado Municipio
Yauco Municipio, PR 15 km (9 mi) ENE of here earthquakes near Yauco Municipio
Jayuya Municipio, PR 17 km (10 mi) WSW of here earthquakes near Jayuya Municipio
Guayanilla Municipio, PR 17 km (11 mi) NNE of here earthquakes near Guayanilla 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. 2.6 2 km SSW of Las Marías, Puerto Rico
  2. 2.8 0 km E of Palomas, Puerto Rico
  3. 2.3 2 km SW of Indios, Puerto Rico
  4. 2.4 5 km E of La Parguera, Puerto Rico
  5. 2.8 8 km SE of La Parguera, Puerto Rico
  6. 2.6 3 km WSW of La Parguera, Puerto Rico
  7. 2.4 8 km SW of La Parguera, Puerto Rico
  8. 2.0 3 km S of Guánica, Puerto Rico
  9. 2.4 2 km SW of Indios, Puerto Rico
  10. 2.6 2 km SSW of Guánica, Puerto Rico
  11. 2.1 7 km WSW of Guánica, Puerto Rico
  12. 2.5 Puerto Rico region
  13. 2.0 7 km SSE of Guánica, Puerto Rico
  14. 2.5 Puerto Rico region
  15. 1.8 7 km ESE of Pole Ojea, 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 300,000 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.