QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

4 km ESE of Las Marías, Puerto Rico

· 26 km deep · released about 40 lb of TNT

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10 km30 km60 km120 km N Las Marías Municipio 2 kmMaricao Municipio 7 kmLares Municipio 10 kmSan Sebastián Municipio 11 kmSan Germán Municipio 16 kmSabana Grande Municipio 16 kmYauco Municipio 19 kmAñasco Municipio 19 kmHormigueros Municipio 20 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
26 km below the surface
Felt
no reports yet
Nearest
Las Marías Municipio, 2 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3214 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 18.2316, -66.9566. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Las Marías Municipio, PR 2 km (1 mi) ENE of here earthquakes near Las Marías Municipio
Maricao Municipio, PR 7 km (4 mi) NNW of here earthquakes near Maricao Municipio
Lares Municipio, PR 10 km (7 mi) WSW of here earthquakes near Lares Municipio
San Sebastián Municipio, PR 11 km (7 mi) S of here earthquakes near San Sebastián Municipio
San Germán Municipio, PR 16 km (10 mi) NNE of here earthquakes near San Germán Municipio
Sabana Grande Municipio, PR 16 km (10 mi) N 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

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

  1. 2.8 7 km SSE of Maria Antonia, Puerto Rico
  2. 2.7 13 km WNW of Puerto Real, Puerto Rico
  3. 2.5 18 km SSW of Stella, Puerto Rico
  4. 2.0 12 km WNW of Puerto Real, Puerto Rico
  5. 2.5 Mona Passage
  6. 2.3 18 km WNW of Puerto Real, Puerto Rico
  7. 3.0 11 km N of Camuy, Puerto Rico
  8. 2.0 7 km WSW of Puerto Real, Puerto Rico
  9. 1.7 13 km S of Indios, Puerto Rico
  10. 2.9 6 km NNW of Camuy, Puerto Rico
  11. 2.7 7 km W of Mayagüez, Puerto Rico
  12. 2.5 0 km NNE of Mayagüez, Puerto Rico
  13. 2.0 5 km SE of Ponce, Puerto Rico
  14. 2.2 6 km ENE of La Parguera, Puerto Rico
  15. 1.9 6 km W of Stella, 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.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.