QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8md

3 km WNW of Hormigueros, Puerto Rico

· 20 km deep · released about 490 lb of TNT

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10 km30 km60 km120 km N Hormigueros Municipio 5 kmSan Germán Municipio 14 kmAñasco Municipio 16 kmCabo Rojo Municipio 17 kmLas Marías Municipio 21 kmLajas Municipio 23 kmRincón Municipio 23 kmSabana Grande Municipio 23 kmMaricao 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
20 km below the surface
Felt
no reports yet
Nearest
Hormigueros Municipio, 5 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1929 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 490 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 31,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 22,000× the energy of this one
  3. Around the size people start to feel M 3.0 1.9× the energy of this one
  4. This earthquake M 2.8 about 490 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 18.1486, -67.1590. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Hormigueros Municipio, PR 5 km (3 mi) WNW of here earthquakes near Hormigueros Municipio
San Germán Municipio, PR 14 km (8 mi) WNW of here earthquakes near San Germán Municipio
Añasco Municipio, PR 16 km (10 mi) S of here earthquakes near Añasco Municipio
Cabo Rojo Municipio, PR 17 km (11 mi) N of here earthquakes near Cabo Rojo Municipio
Las Marías Municipio, PR 21 km (13 mi) WSW of here earthquakes near Las Marías Municipio
Lajas Municipio, PR 23 km (14 mi) NNW of here earthquakes near Lajas 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. 2.3 11 km S of Indios, Puerto Rico
  2. 1.8 4 km N of Yauco, Puerto Rico
  3. 2.6 3 km SSE of Magas Arriba, Puerto Rico
  4. 3.3 7 km WSW of La Parguera, Puerto Rico
  5. 2.8 7 km WSW of Fuig, Puerto Rico
  6. 2.1 7 km S of Indios, Puerto Rico
  7. 2.5 3 km SW of Indios, Puerto Rico
  8. 2.4 4 km SW of Guánica, Puerto Rico
  9. 2.9 4 km ESE of La Parguera, Puerto Rico
  10. 2.6 6 km SW of Liborio Negron Torres, Puerto Rico
  11. 2.4 6 km ESE of La Parguera, Puerto Rico
  12. 2.1 4 km SSE of Maria Antonia, Puerto Rico
  13. 3.4 5 km SE of La Parguera, Puerto Rico
  14. 2.3 6 km S of Indios, Puerto Rico
  15. 2.7 4 km SSE of La Parguera, 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 240,000 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.