QuakeIndex

Earthquake · reviewed by a seismologist

M 3.6md

1 km NW of Palmarejo, Puerto Rico

· 137 km deep · released about 4.3 tons of TNT

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10 km30 km60 km120 km N Coamo Municipio 4 kmAibonito Municipio 10 kmSalinas Municipio 14 kmBarranquitas Municipio 14 kmSanta Isabel Municipio 15 kmVillalba Municipio 16 kmJuana Díaz Municipio 19 kmOrocovis Municipio 19 kmCayey Municipio 19 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 3.6 (md)
Depth
137 km below the surface
Felt
no reports yet
Nearest
Coamo Municipio, 4 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 853 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

How big was it?

This earthquake released about 4.3 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.6 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 39,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 1,700× the energy of this one
  3. Magna, Utah 2020 M 5.7 1,200× the energy of this one
  4. This earthquake M 3.6 about 4.3 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 9.1× more

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 18.0753, -66.3335. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Coamo Municipio, PR 4 km (3 mi) SE of here earthquakes near Coamo Municipio
Aibonito Municipio, PR 10 km (6 mi) SW of here earthquakes near Aibonito Municipio
Salinas Municipio, PR 14 km (9 mi) NNW of here earthquakes near Salinas Municipio
Barranquitas Municipio, PR 14 km (9 mi) S of here earthquakes near Barranquitas Municipio
Santa Isabel Municipio, PR 15 km (9 mi) NNE of here earthquakes near Santa Isabel Municipio
Villalba Municipio, PR 16 km (10 mi) ESE of here earthquakes near Villalba Municipio

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

Aftershocks so far

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

  1. 2.2 1 km WSW of Santo Domingo, Puerto Rico
  2. 2.4 6 km SSE of Salinas, Puerto Rico
  3. 2.0 7 km SSW of Orocovis, Puerto Rico
  4. 2.3 2 km N of Guayanilla, Puerto Rico
  5. 1.6 7 km SSE of Salinas, Puerto Rico
  6. 2.4 3 km WSW of Potala Pastillo, Puerto Rico
  7. 2.0 1 km W of Ponce, Puerto Rico
  8. 2.0 5 km SW of Central Aguirre, Puerto Rico
  9. 2.3 4 km WSW of Parcelas La Milagrosa, Puerto Rico
  10. 2.5 2 km SSW of Peñuelas, Puerto Rico
  11. 2.3 11 km S of Arroyo, Puerto Rico
  12. 2.3 5 km WSW of Central Aguirre, Puerto Rico
  13. 2.3 11 km S of Arroyo, Puerto Rico
  14. 1.9 7 km ESE of G. L. Garcia, Puerto Rico
  15. 2.0 5 km S of Salinas, 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 5.6 on 2020-01-07 — it released about 870 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.