QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8md

3 km NNE of Hormigueros, Puerto Rico

· 32 km deep · released about 550 lb of TNT

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10 km30 km60 km120 km N Hormigueros Municipio 3 kmSan Germán Municipio 10 kmAñasco Municipio 14 kmLas Marías Municipio 16 kmMaricao Municipio 19 kmSabana Grande Municipio 20 kmCabo Rojo Municipio 20 kmLajas Municipio 22 kmSan Sebastián Municipio 24 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
32 km below the surface
Felt
no reports yet
Nearest
Hormigueros Municipio, 3 km S
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.

How big was it?

This earthquake released about 550 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 28,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 19,000× the energy of this one
  3. Around the size people start to feel M 3.0 1.7× the energy of this one
  4. This earthquake M 2.8 about 550 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 18.1650, -67.1118. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Hormigueros Municipio, PR 3 km (2 mi) N of here earthquakes near Hormigueros Municipio
San Germán Municipio, PR 10 km (6 mi) NW of here earthquakes near San Germán Municipio
Añasco Municipio, PR 14 km (9 mi) S of here earthquakes near Añasco Municipio
Las Marías Municipio, PR 16 km (10 mi) WSW of here earthquakes near Las Marías Municipio
Maricao Municipio, PR 19 km (12 mi) W of here earthquakes near Maricao Municipio
Sabana Grande Municipio, PR 20 km (12 mi) WNW of here earthquakes near Sabana Grande Municipio

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

Aftershocks so far

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

  1. 2.1 6 km SSE of Maria Antonia, Puerto Rico
  2. 3.0 0 km ESE of Magas Arriba, Puerto Rico
  3. 2.0 3 km S of La Parguera, Puerto Rico
  4. 3.0 3 km S of La Parguera, Puerto Rico
  5. 2.0 2 km S of La Parguera, Puerto Rico
  6. 1.9 2 km S of Guánica, Puerto Rico
  7. 1.9 6 km WSW of Fuig, Puerto Rico
  8. 2.3 7 km ESE of La Parguera, Puerto Rico
  9. 1.9 3 km SW of Guánica, Puerto Rico
  10. 2.6 10 km SSE of Maria Antonia, Puerto Rico
  11. 2.5 5 km SE of Maria Antonia, Puerto Rico
  12. 2.2 Puerto Rico region
  13. 2.4 Puerto Rico region
  14. 3.0 3 km SSW of Indios, Puerto Rico
  15. 2.5 4 km WSW of Guánica, 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 220,000 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.