QuakeIndex

Earthquake · reviewed by a seismologist

M 3.4md

16 km SSE of Central Aguirre, Puerto Rico

· 7.1 km deep · released about 2 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Guayama Municipio 19 kmSalinas Municipio 19 kmArroyo Municipio 24 kmSanta Isabel Municipio 26 kmPatillas Municipio 30 kmCayey Municipio 33 kmAibonito Municipio 36 kmCoamo Municipio 37 kmMaunabo Municipio 38 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 3.4 (md)
Depth
7.1 km below the surface
Felt
no reports yet
Nearest
Guayama Municipio, 19 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1446 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 2 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.4 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 86,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 3,800× the energy of this one
  3. Magna, Utah 2020 M 5.7 2,700× the energy of this one
  4. This earthquake M 3.4 about 2 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 4.1× 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 17.8107, -66.1920. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Guayama Municipio, PR 19 km (12 mi) SSW of here earthquakes near Guayama Municipio
Salinas Municipio, PR 19 km (12 mi) SSE of here earthquakes near Salinas Municipio
Arroyo Municipio, PR 24 km (15 mi) SW of here earthquakes near Arroyo Municipio
Santa Isabel Municipio, PR 26 km (16 mi) SE of here earthquakes near Santa Isabel Municipio
Patillas Municipio, PR 30 km (19 mi) SW of here earthquakes near Patillas Municipio
Cayey Municipio, PR 33 km (20 mi) S of here earthquakes near Cayey Municipio

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

Aftershocks so far

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

  1. 3.4 4 km SSW of Potala Pastillo, Puerto Rico
  2. 3.4 5 km SSW of Potala Pastillo, Puerto Rico
  3. 2.3 2 km SE of Lamboglia, Puerto Rico
  4. 2.3 3 km ESE of Salinas, Puerto Rico
  5. 3.0 6 km SSW of Potala Pastillo, Puerto Rico
  6. 1.9 2 km SSE of Lamboglia, Puerto Rico
  7. 2.4 Puerto Rico region
  8. 2.2 5 km SSW of Potala Pastillo, Puerto Rico
  9. 3.0 3 km ESE of Cayey, Puerto Rico
  10. 3.0 3 km E of Cayey, Puerto Rico
  11. 1.8 2 km SW of G. L. Garcia, Puerto Rico
  12. 2.1 3 km ENE of Mariano Colón, Puerto Rico
  13. 2.0 9 km S of Ponce, Puerto Rico
  14. 2.3 5 km SSW of Potala Pastillo, Puerto Rico
  15. 2.2 7 km S of Ponce, 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 61 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.