QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

2 km SSE of Hormigueros, Puerto Rico

· 18 km deep · released about 40 lb of TNT

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10 km30 km60 km120 km N Hormigueros Municipio 1 kmSan Germán Municipio 9 kmCabo Rojo Municipio 16 kmLajas Municipio 18 kmAñasco Municipio 18 kmSabana Grande Municipio 19 kmLas Marías Municipio 19 kmMaricao Municipio 20 kmRincón Municipio 28 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 2.1 (md)
Depth
18 km below the surface
Felt
no reports yet
Nearest
Hormigueros Municipio, 1 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2864 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

How big was it?

This earthquake released about 40 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 380,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 270,000× the energy of this one
  3. Around the size people start to feel M 3.0 24× the energy of this one
  4. This earthquake M 2.1 about 40 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 18.1235, -67.1185. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Hormigueros Municipio, PR 1 km (1 mi) S of here earthquakes near Hormigueros Municipio
San Germán Municipio, PR 9 km (5 mi) WNW of here earthquakes near San Germán Municipio
Cabo Rojo Municipio, PR 16 km (10 mi) NNE of here earthquakes near Cabo Rojo Municipio
Lajas Municipio, PR 18 km (11 mi) NNW of here earthquakes near Lajas Municipio
Añasco Municipio, PR 18 km (11 mi) S of here earthquakes near Añasco Municipio
Sabana Grande Municipio, PR 19 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

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

  1. 2.0 7 km WSW of Las Marías, Puerto Rico
  2. 1.9 12 km SSE of Lares, Puerto Rico
  3. 1.7 9 km SSW of Guánica, Puerto Rico
  4. 1.9 4 km NNW of Sabana Grande, Puerto Rico
  5. 2.0 11 km WNW of Puerto Real, Puerto Rico
  6. 2.7 36 km W of Puerto Real, Puerto Rico
  7. 1.8 0 km SE of Fuig, Puerto Rico
  8. 2.6 7 km S of Guánica, Puerto Rico
  9. 2.5 7 km S of Guánica, Puerto Rico
  10. 1.9 3 km ESE of Espino, Puerto Rico
  11. 1.8 5 km S of Adjuntas, Puerto Rico
  12. 1.6 12 km SSW of Guánica, Puerto Rico
  13. 1.8 7 km NE of Sabana Grande, Puerto Rico
  14. 2.2 21 km S of La Parguera, Puerto Rico
  15. 2.5 13 km WNW of San Antonio, 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 4.3 on 2017-10-14 — it released about 2,100 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.