QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

1 km SW of Guayanilla, Puerto Rico

· 21 km deep · released about 38 lb of TNT

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10 km30 km60 km120 km N Guayanilla Municipio 1 kmPeñuelas Municipio 8 kmYauco Municipio 10 kmGuánica Municipio 15 kmSabana Grande Municipio 17 kmAdjuntas Municipio 19 kmPonce Municipio 21 kmMaricao Municipio 23 kmLajas Municipio 25 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
Guayanilla Municipio, 1 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2829 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 38 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 5.8 390,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 280,000× the energy of this one
  3. Around the size people start to feel M 3.0 25× the energy of this one
  4. This earthquake M 2.1 about 38 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 18.0121, -66.8016. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Guayanilla Municipio, PR 1 km (1 mi) NNW of here earthquakes near Guayanilla Municipio
Peñuelas Municipio, PR 8 km (5 mi) WSW of here earthquakes near Peñuelas Municipio
Yauco Municipio, PR 10 km (6 mi) SE of here earthquakes near Yauco Municipio
Guánica Municipio, PR 15 km (9 mi) ENE of here earthquakes near Guánica Municipio
Sabana Grande Municipio, PR 17 km (11 mi) ESE of here earthquakes near Sabana Grande Municipio
Adjuntas Municipio, PR 19 km (12 mi) SSW of here earthquakes near Adjuntas Municipio

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

Aftershocks so far

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

  1. 2.7 5 km S of Jayuya, Puerto Rico
  2. 1.8 1 km S of San Germán, Puerto Rico
  3. 2.0 4 km S of Guánica, Puerto Rico
  4. 1.7 3 km SSE of Santa Isabel, Puerto Rico
  5. 2.3 4 km ENE of Hormigueros, Puerto Rico
  6. 1.5 3 km SE of La Parguera, Puerto Rico
  7. 1.8 4 km SE of Indios, Puerto Rico
  8. 2.1 1 km S of Guayanilla, Puerto Rico
  9. 1.9 11 km ESE of Maricao, Puerto Rico
  10. 1.5 1 km SSW of Liborio Negron Torres, Puerto Rico
  11. 1.8 3 km W of Rafael Capo, Puerto Rico
  12. 2.1 2 km NE of San Germán, Puerto Rico
  13. 2.0 3 km SW of Adjuntas, Puerto Rico
  14. 1.5 6 km E of La Parguera, Puerto Rico
  15. 2.5 34 km SSE 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.

On USGS

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