QuakeIndex

Earthquake · reviewed by a seismologist

M 2.7md

27 km N of Loíza, Puerto Rico

· 36 km deep · released about 350 lb of TNT

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10 km30 km60 km120 km N Loíza Municipio 27 kmCarolina Municipio 33 kmRío Grande Municipio 34 kmSan Juan Municipio 36 kmLuquillo Municipio 38 kmCanóvanas Municipio 39 kmCataño Municipio 40 kmTrujillo Alto Municipio 41 kmToa Baja 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
36 km below the surface
Felt
no reports yet
Nearest
Loíza Municipio, 27 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3115 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 350 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 43,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 31,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.7× the energy of this one
  4. This earthquake M 2.7 about 350 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 18.6758, -65.8621. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Loíza Municipio, PR 27 km (17 mi) NNE of here earthquakes near Loíza Municipio
Carolina Municipio, PR 33 km (21 mi) NNE of here earthquakes near Carolina Municipio
Río Grande Municipio, PR 34 km (21 mi) NNW of here earthquakes near Río Grande Municipio
San Juan Municipio, PR 36 km (22 mi) NE of here earthquakes near San Juan Municipio
Luquillo Municipio, PR 38 km (23 mi) NNW of here earthquakes near Luquillo Municipio
Canóvanas Municipio, PR 39 km (24 mi) N of here earthquakes near Canóvanas Municipio

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

Aftershocks so far

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

  1. 2.5 4 km NNE of Guaynabo, Puerto Rico
  2. 2.1 44 km NNE of Luquillo, Puerto Rico
  3. 2.3 2 km SSW of Bayamón, Puerto Rico
  4. 2.5 12 km NNE of Brenas, Puerto Rico
  5. 2.8 2 km NW of Dorado, Puerto Rico
  6. 2.5 0 km ENE of San Juan, Puerto Rico
  7. 2.2 5 km NNW of Levittown, Puerto Rico
  8. 1.9 9 km N of Levittown, Puerto Rico
  9. 2.4 39 km N of San Juan, Puerto Rico
  10. 3.1 1 km SSW of Santa Barbara, Puerto Rico
  11. 3.2 26 km NW of Culebra, Puerto Rico
  12. 2.4 44 km N of San Juan, Puerto Rico
  13. 2.5 27 km N of Brenas, Puerto Rico
  14. 2.7 22 km NNW of San Juan, Puerto Rico
  15. 2.8 15 km NNE of Suárez, 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.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.