QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6md

4 km WSW of Adjuntas, Puerto Rico

· 27 km deep · released about 8.1 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Adjuntas Municipio 5 kmYauco Municipio 12 kmPeñuelas Municipio 13 kmGuayanilla Municipio 16 kmUtuado Municipio 16 kmMaricao Municipio 19 kmLares Municipio 19 kmJayuya Municipio 20 kmSabana Grande Municipio 21 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 1.6 (md)
Depth
27 km below the surface
Felt
no reports yet
Nearest
Adjuntas Municipio, 5 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 178 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 8.1 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.6 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,900,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,300,000× the energy of this one
  3. Around the size people start to feel M 3.0 120× the energy of this one
  4. This earthquake M 1.6 about 8.1 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 18.1397, -66.7588. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Adjuntas Municipio, PR 5 km (3 mi) S of here earthquakes near Adjuntas Municipio
Yauco Municipio, PR 12 km (7 mi) ENE of here earthquakes near Yauco Municipio
Peñuelas Municipio, PR 13 km (8 mi) NNW of here earthquakes near Peñuelas Municipio
Guayanilla Municipio, PR 16 km (10 mi) NNE of here earthquakes near Guayanilla Municipio
Utuado Municipio, PR 16 km (10 mi) SSW of here earthquakes near Utuado Municipio
Maricao Municipio, PR 19 km (12 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. 2.3 4 km SSW of Indios, Puerto Rico
  2. 2.9 2 km S of Indios, Puerto Rico
  3. 2.3 6 km WSW of Fuig, Puerto Rico
  4. 2.5 5 km N of Coamo, Puerto Rico
  5. 2.5 7 km SSE of Indios, Puerto Rico
  6. 2.2 3 km WSW of Santo Domingo, Puerto Rico
  7. 2.2 2 km E of Sabana Grande, Puerto Rico
  8. 1.8 6 km WSW of Fuig, Puerto Rico
  9. 1.9 4 km SSW of Palmarejo, Puerto Rico
  10. 2.2 3 km WSW of Fuig, Puerto Rico
  11. 2.5 8 km SW of Guánica, Puerto Rico
  12. 1.9 5 km SSW of Liborio Negron Torres, Puerto Rico
  13. 2.2 2 km ESE of Palomas, Puerto Rico
  14. 2.2 3 km SW of Indios, Puerto Rico
  15. 2.0 1 km E of Magas Arriba, 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 15,000,000 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.