QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1md

10 km S of Lamboglia, Puerto Rico

· 26 km deep · released about 1,300 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Arroyo Municipio 11 kmPatillas Municipio 13 kmMaunabo Municipio 16 kmGuayama Municipio 18 kmYabucoa Municipio 24 kmSan Lorenzo Municipio 29 kmCayey Municipio 30 kmSalinas Municipio 30 kmHumacao Municipio 35 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
26 km below the surface
Felt
no reports yet
Nearest
Arroyo Municipio, 11 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1109 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 1,300 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 6.7 270,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 12,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 8,500× the energy of this one
  4. This earthquake M 3.1 about 1,300 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.3× 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 17.8857, -65.9908. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Arroyo Municipio, PR 11 km (7 mi) SSE of here earthquakes near Arroyo Municipio
Patillas Municipio, PR 13 km (8 mi) S of here earthquakes near Patillas Municipio
Maunabo Municipio, PR 16 km (10 mi) SW of here earthquakes near Maunabo Municipio
Guayama Municipio, PR 18 km (11 mi) ESE of here earthquakes near Guayama Municipio
Yabucoa Municipio, PR 24 km (15 mi) SW of here earthquakes near Yabucoa Municipio
San Lorenzo Municipio, PR 29 km (18 mi) S of here earthquakes near San Lorenzo Municipio

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

Aftershocks so far

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

  1. 3.2 8 km SSE of Jobos, Puerto Rico
  2. 1.9 Puerto Rico region
  3. 2.3 6 km SSE of Jobos, Puerto Rico
  4. 2.1 6 km SSE of Jobos, Puerto Rico
  5. 2.3 5 km SSE of Jobos, Puerto Rico
  6. 2.1 7 km SSE of Jobos, Puerto Rico
  7. 2.8 8 km SSE of Jobos, Puerto Rico
  8. 3.2 4 km SSE of Salinas, Puerto Rico
  9. 1.9 7 km SSE of Salinas, Puerto Rico
  10. 3.1 4 km S of Salinas, Puerto Rico
  11. 3.5 3 km S of Salinas, Puerto Rico
  12. 2.5 17 km S of Central Aguirre, Puerto Rico
  13. 2.1 5 km SSE of Salinas, Puerto Rico
  14. 2.5 10 km S of Emajagua, Puerto Rico
  15. 2.1 4 km SSE 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 4.6 on 2016-12-05 — it released about 190 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.