QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1md

47 km N of Loíza, Puerto Rico

· 52 km deep · released about 1,200 lb of TNT

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10 km30 km60 km120 km N Loíza Municipio 46 kmSan Juan Municipio 51 kmCarolina Municipio 52 kmCataño Municipio 52 kmToa Baja Municipio 53 kmRío Grande Municipio 55 kmDorado Municipio 56 kmLuquillo Municipio 59 kmCanóvanas Municipio 59 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 3.1 (md)
Depth
52 km below the surface
Felt
no reports yet
Nearest
Loíza Municipio, 46 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3141 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 1,200 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.1 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 280,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 12,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 8,800× the energy of this one
  4. This earthquake M 3.1 about 1,200 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.3× more

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 18.8578, -65.9133. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Loíza Municipio, PR 46 km (29 mi) N of here earthquakes near Loíza Municipio
San Juan Municipio, PR 51 km (32 mi) NNE of here earthquakes near San Juan Municipio
Carolina Municipio, PR 52 km (32 mi) N of here earthquakes near Carolina Municipio
Cataño Municipio, PR 52 km (32 mi) NNE of here earthquakes near Cataño Municipio
Toa Baja Municipio, PR 53 km (33 mi) NNE of here earthquakes near Toa Baja Municipio
Río Grande Municipio, PR 55 km (34 mi) NNW of here earthquakes near Río Grande Municipio

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

Aftershocks so far

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

  1. 2.6 80 km N of San Juan, Puerto Rico
  2. 3.3 29 km NNE of Luquillo, Puerto Rico
  3. 2.7 27 km N of Loíza, Puerto Rico
  4. 2.9 86 km N of San Juan, Puerto Rico
  5. 2.7 4 km WNW of San Juan, Puerto Rico
  6. 2.8 22 km N of Suárez, Puerto Rico
  7. 3.1 24 km N of Suárez, Puerto Rico
  8. 3.1 77 km N of San Juan, Puerto Rico
  9. 2.8 41 km N of Brenas, Puerto Rico
  10. 2.9 37 km NE of Luquillo, Puerto Rico
  11. 3.2 87 km N of San Juan, Puerto Rico
  12. 3.4 75 km NNE of Vieques, Puerto Rico
  13. 2.4 75 km N of Suárez, Puerto Rico
  14. 3.4 65 km N of San Juan, Puerto Rico
  15. 3.1 67 km NNE 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.8 on 2017-08-18 — it released about 390 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.