QuakeIndex

Earthquake · reviewed by a seismologist

M 2.9md

17 km S of Central Aguirre, Puerto Rico

· 6.9 km deep · released about 650 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Salinas Municipio 20 kmGuayama Municipio 21 kmArroyo Municipio 26 kmSanta Isabel Municipio 26 kmPatillas Municipio 32 kmCayey Municipio 35 kmAibonito Municipio 38 kmJuana Díaz Municipio 38 kmCoamo 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 2.9 (md)
Depth
6.9 km below the surface
Felt
no reports yet
Nearest
Salinas Municipio, 20 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 865 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 650 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 23,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 16,000× the energy of this one
  3. Around the size people start to feel M 3.0 1.5× the energy of this one
  4. This earthquake M 2.9 about 650 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 17.7972, -66.2027. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Salinas Municipio, PR 20 km (13 mi) SSE of here earthquakes near Salinas Municipio
Guayama Municipio, PR 21 km (13 mi) SSW of here earthquakes near Guayama Municipio
Arroyo Municipio, PR 26 km (16 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 32 km (20 mi) SW of here earthquakes near Patillas Municipio
Cayey Municipio, PR 35 km (21 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

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

  1. 2.3 10 km S of Ponce, Puerto Rico
  2. 2.6 15 km ESE of Emajagua, Puerto Rico
  3. 2.5 12 km SSE of Ponce, Puerto Rico
  4. 2.3 3 km NNE of El Ojo, Puerto Rico
  5. 1.9 2 km SW of Central Aguirre, Puerto Rico
  6. 2.2 5 km WSW of Central Aguirre, Puerto Rico
  7. 2.5 1 km S of La Plena, Puerto Rico
  8. 2.4 5 km SSE of Salinas, Puerto Rico
  9. 2.3 7 km S of Orocovis, Puerto Rico
  10. 2.4 6 km S of Salinas, Puerto Rico
  11. 2.4 16 km SSE of Ponce, Puerto Rico
  12. 2.2 4 km SSW of Potala Pastillo, Puerto Rico
  13. 3.1 4 km SSW of Potala Pastillo, Puerto Rico
  14. 2.5 5 km SSE of G. L. Garcia, Puerto Rico
  15. 2.5 15 km SSE 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 370 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.