QuakeIndex

Earthquake · reviewed by a seismologist

M 2.9md

26 km SSE of Arroyo, Puerto Rico

· 3.4 km deep · released about 700 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Arroyo Municipio 27 kmPatillas Municipio 30 kmGuayama Municipio 30 kmMaunabo Municipio 31 kmSalinas Municipio 38 kmYabucoa Municipio 39 kmCayey Municipio 44 kmSan Lorenzo Municipio 46 kmSanta Isabel Municipio 48 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
3.4 km below the surface
Felt
no reports yet
Nearest
Arroyo Municipio, 27 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 820 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 700 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 22,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 15,000× the energy of this one
  3. Around the size people start to feel M 3.0 1.4× the energy of this one
  4. This earthquake M 2.9 about 700 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 17.7347, -65.9998. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Arroyo Municipio, PR 27 km (17 mi) S of here earthquakes near Arroyo Municipio
Patillas Municipio, PR 30 km (18 mi) S of here earthquakes near Patillas Municipio
Guayama Municipio, PR 30 km (19 mi) SSE of here earthquakes near Guayama Municipio
Maunabo Municipio, PR 31 km (20 mi) SSW of here earthquakes near Maunabo Municipio
Salinas Municipio, PR 38 km (24 mi) SE of here earthquakes near Salinas Municipio
Yabucoa Municipio, PR 39 km (24 mi) SSW of here earthquakes near Yabucoa Municipio

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

Aftershocks so far

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

  1. 2.2 20 km SE of El Negro, Puerto Rico
  2. 2.1 8 km S of Lamboglia, Puerto Rico
  3. 3.5 4 km ESE of G. L. Garcia, Puerto Rico
  4. 2.2 1 km SSW of G. L. Garcia, Puerto Rico
  5. 3.4 4 km SE of G. L. Garcia, Puerto Rico
  6. 2.8 4 km WNW of Candelero Arriba, Puerto Rico
  7. 2.3 4 km SSE of Salinas, Puerto Rico
  8. 2.5 18 km S of Lamboglia, Puerto Rico
  9. 3.0 18 km S of Lamboglia, Puerto Rico
  10. 2.7 29 km SSW of Esperanza, Puerto Rico
  11. 2.1 24 km S of Lamboglia, Puerto Rico
  12. 2.3 29 km S of Central Aguirre, Puerto Rico
  13. 2.2 2 km E of Cayey, Puerto Rico
  14. 2.0 4 km NNW of Jobos, Puerto Rico
  15. 2.3 11 km SSE of Arroyo, 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 340 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.