QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1Md

6 km SW of Adjuntas, Puerto Rico

· 21 km deep · released about 43 lb of TNT

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10 km30 km60 km120 km N Adjuntas Municipio 7 kmYauco Municipio 10 kmPeñuelas Municipio 12 kmGuayanilla Municipio 13 kmUtuado Municipio 18 kmMaricao Municipio 18 kmSabana Grande Municipio 19 kmLares Municipio 20 kmJayuya 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 2.1 (Md)
Depth
21 km below the surface
Felt
no reports yet
Nearest
Adjuntas Municipio, 7 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3609 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 43 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 5.8 350,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 250,000× the energy of this one
  3. Around the size people start to feel M 3.0 22× the energy of this one
  4. This earthquake M 2.1 about 43 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 18.1231, -66.7723. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Adjuntas Municipio, PR 7 km (4 mi) SSW of here earthquakes near Adjuntas Municipio
Yauco Municipio, PR 10 km (6 mi) ENE of here earthquakes near Yauco Municipio
Peñuelas Municipio, PR 12 km (7 mi) NNW of here earthquakes near Peñuelas Municipio
Guayanilla Municipio, PR 13 km (8 mi) NNE of here earthquakes near Guayanilla Municipio
Utuado Municipio, PR 18 km (11 mi) SSW of here earthquakes near Utuado Municipio
Maricao Municipio, PR 18 km (11 mi) ESE of here earthquakes near Maricao Municipio

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

Aftershocks so far

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

  1. 1.6 7 km WSW of La Parguera, Puerto Rico
  2. 2.1 1 km SE of San Germán, Puerto Rico
  3. 2.4 7 km WSW of La Parguera, Puerto Rico
  4. 2.7 18 km SSE of Tallaboa, Puerto Rico
  5. 1.9 8 km WSW of La Parguera, Puerto Rico
  6. 2.4 7 km WSW of La Parguera, Puerto Rico
  7. 2.6 5 km WNW of La Parguera, Puerto Rico
  8. 2.6 5 km WSW of La Parguera, Puerto Rico
  9. 2.1 2 km NE of Guayabal, Puerto Rico
  10. 2.4 8 km SSE of La Parguera, Puerto Rico
  11. 2.3 20 km S of La Parguera, Puerto Rico
  12. 2.9 5 km NNE of Orocovis, Puerto Rico
  13. 2.3 13 km SSW of Guánica, Puerto Rico
  14. 2.4 1 km W of San Germán, Puerto Rico
  15. 1.7 1 km WNW of Monte Grande, 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.