QuakeIndex

Earthquake · reviewed by a seismologist

M 2.7md

18 km SSE of Arroyo, Puerto Rico

· 6.6 km deep · released about 330 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Arroyo Municipio 18 kmPatillas Municipio 21 kmGuayama Municipio 23 kmMaunabo Municipio 24 kmYabucoa Municipio 31 kmSalinas Municipio 33 kmCayey Municipio 36 kmSan Lorenzo Municipio 37 kmHumacao Municipio 43 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 2.7 (md)
Depth
6.6 km below the surface
Felt
no reports yet
Nearest
Arroyo Municipio, 18 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1430 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 330 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 46,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 33,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.9× the energy of this one
  4. This earthquake M 2.7 about 330 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 17.8127, -66.0027. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Arroyo Municipio, PR 18 km (11 mi) SSE of here earthquakes near Arroyo Municipio
Patillas Municipio, PR 21 km (13 mi) S of here earthquakes near Patillas Municipio
Guayama Municipio, PR 23 km (14 mi) SE of here earthquakes near Guayama Municipio
Maunabo Municipio, PR 24 km (15 mi) SSW of here earthquakes near Maunabo Municipio
Yabucoa Municipio, PR 31 km (19 mi) SSW of here earthquakes near Yabucoa Municipio
Salinas Municipio, PR 33 km (20 mi) ESE of here earthquakes near Salinas Municipio

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

Aftershocks so far

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

  1. 2.0 1 km NNW of Punta Santiago, Puerto Rico
  2. 3.4 2 km SE of Aguas Buenas, Puerto Rico
  3. 2.4 2 km NW of Punta Santiago, Puerto Rico
  4. 2.0 4 km NW of Yaurel, Puerto Rico
  5. 2.1 20 km SSE of Arroyo, Puerto Rico
  6. 2.5 0 km N of Vázquez, Puerto Rico
  7. 2.9 2 km NNW of Punta Santiago, Puerto Rico
  8. 2.3 10 km S of Emajagua, Puerto Rico
  9. 3.0 3 km WSW of La Plena, Puerto Rico
  10. 2.6 6 km SSW of Lamboglia, Puerto Rico
  11. 2.5 11 km S of Santa Isabel, Puerto Rico
  12. 2.8 Puerto Rico region
  13. 2.2 Puerto Rico region
  14. 3.1 Puerto Rico region
  15. 2.5 3 km WSW of Central Aguirre, 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 730 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.