QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1md

3 km SSW of Cayey, Puerto Rico

· 14 km deep · released about 1,500 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Cayey Municipio 4 kmCidra Municipio 10 kmAibonito Municipio 10 kmGuayama Municipio 13 kmSalinas Municipio 15 kmComerío Municipio 16 kmBarranquitas Municipio 19 kmCoamo Municipio 19 kmArroyo 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 3.1 (md)
Depth
14 km below the surface
Felt
no reports yet
Nearest
Cayey Municipio, 4 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1348 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 1,500 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.1 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 230,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 10,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 7,200× the energy of this one
  4. This earthquake M 3.1 about 1,500 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.6× 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 18.0842, -66.1797. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Cayey Municipio, PR 4 km (2 mi) SW of here earthquakes near Cayey Municipio
Cidra Municipio, PR 10 km (6 mi) S of here earthquakes near Cidra Municipio
Aibonito Municipio, PR 10 km (6 mi) ESE of here earthquakes near Aibonito Municipio
Guayama Municipio, PR 13 km (8 mi) NNW of here earthquakes near Guayama Municipio
Salinas Municipio, PR 15 km (9 mi) NE of here earthquakes near Salinas Municipio
Comerío Municipio, PR 16 km (10 mi) SSE of here earthquakes near Comerío Municipio

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

Aftershocks so far

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

  1. 2.9 9 km SSE of Bajandas, Puerto Rico
  2. 3.2 3 km NNW of Jayuya, Puerto Rico
  3. 3.1 6 km ENE of San Juan, Puerto Rico
  4. 2.2 8 km S of Ponce, Puerto Rico
  5. 2.9 5 km S of Jagual, Puerto Rico
  6. 2.0 1 km NNW of Punta Santiago, Puerto Rico
  7. 3.4 2 km SE of Aguas Buenas, Puerto Rico
  8. 2.4 2 km NW of Punta Santiago, Puerto Rico
  9. 2.0 4 km NW of Yaurel, Puerto Rico
  10. 2.1 20 km SSE of Arroyo, Puerto Rico
  11. 3.4 3 km NNE of Benitez, Puerto Rico
  12. 2.8 0 km SSW of San Juan, Puerto Rico
  13. 2.5 0 km N of Vázquez, Puerto Rico
  14. 2.9 2 km NNW of Punta Santiago, Puerto Rico
  15. 2.1 6 km NE of Orocovis, 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 4.6 on 2016-12-05 — it released about 160 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.