QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

11 km N of Loíza, Puerto Rico

· 132 km deep · released about 49 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Loíza Municipio 11 kmCarolina Municipio 17 kmRío Grande Municipio 20 kmSan Juan Municipio 22 kmCanóvanas Municipio 22 kmTrujillo Alto Municipio 25 kmLuquillo Municipio 27 kmCataño Municipio 28 kmGurabo Municipio 30 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 2.1 (md)
Depth
132 km below the surface
Felt
no reports yet
Nearest
Loíza Municipio, 11 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2780 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

How big was it?

This earthquake released about 49 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 310,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 220,000× the energy of this one
  3. Around the size people start to feel M 3.0 19× the energy of this one
  4. This earthquake M 2.1 about 49 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 18.5316, -65.8976. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Loíza Municipio, PR 11 km (7 mi) NNE of here earthquakes near Loíza Municipio
Carolina Municipio, PR 17 km (10 mi) NNE of here earthquakes near Carolina Municipio
Río Grande Municipio, PR 20 km (13 mi) NNW of here earthquakes near Río Grande Municipio
San Juan Municipio, PR 22 km (14 mi) NE of here earthquakes near San Juan Municipio
Canóvanas Municipio, PR 22 km (14 mi) N of here earthquakes near Canóvanas Municipio
Trujillo Alto Municipio, PR 25 km (15 mi) NNE of here earthquakes near Trujillo Alto 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. 2.2 26 km N of Dorado, Puerto Rico
  2. 3.0 36 km N of Suárez, Puerto Rico
  3. 2.9 29 km NE of Fajardo, Puerto Rico
  4. 2.3 Puerto Rico region
  5. 2.5 31 km NNE of San Juan, Puerto Rico
  6. 1.9 3 km ENE of Bairoa, Puerto Rico
  7. 2.0 52 km N of Loíza, Puerto Rico
  8. 2.4 24 km N of Dorado, Puerto Rico
  9. 2.2 1 km NW of Sumidero, Puerto Rico
  10. 2.7 2 km SW of H. Rivera Colon, Puerto Rico
  11. 2.0 20 km NE of San Juan, Puerto Rico
  12. 2.6 3 km N of Cidra, Puerto Rico
  13. 2.6 23 km NNE of Luquillo, Puerto Rico
  14. 3.1 37 km NNE of Vieques, Puerto Rico
  15. 2.5 6 km ESE of San Juan, 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.