QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1md

6 km ENE of San Juan, Puerto Rico

· 85 km deep · released about 1,400 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N San Juan Municipio 8 kmCataño Municipio 12 kmLoíza Municipio 12 kmCarolina Municipio 13 kmToa Baja Municipio 16 kmGuaynabo Municipio 18 kmTrujillo Alto Municipio 18 kmBayamón Municipio 21 kmDorado Municipio 23 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
85 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
San Juan Municipio, 8 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 983 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 1 person has reported feeling it to USGS.

How big was it?

This earthquake released about 1,400 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 6.7 230,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 10,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 7,400× the energy of this one
  4. This earthquake M 3.1 about 1,400 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.5× 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 18.4927, -66.0462. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
San Juan Municipio, PR 8 km (5 mi) NNE of here earthquakes near San Juan Municipio
Cataño Municipio, PR 12 km (8 mi) ENE of here earthquakes near Cataño Municipio
Loíza Municipio, PR 12 km (8 mi) WNW of here earthquakes near Loíza Municipio
Carolina Municipio, PR 13 km (8 mi) NW of here earthquakes near Carolina Municipio
Toa Baja Municipio, PR 16 km (10 mi) ENE of here earthquakes near Toa Baja Municipio
Guaynabo Municipio, PR 18 km (11 mi) NNE of here earthquakes near Guaynabo Municipio

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

Aftershocks so far

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

  1. 2.6 Puerto Rico region
  2. 2.8 5 km NNW of Brenas, Puerto Rico
  3. 2.6 2 km WNW of Bayamon, Puerto Rico
  4. 2.9 2 km NNE of Parcelas La Milagrosa, Puerto Rico
  5. 2.7 1 km W of Juncos, Puerto Rico
  6. 3.0 Puerto Rico region
  7. 3.2 6 km N of San Juan, Puerto Rico
  8. 3.0 Puerto Rico region
  9. 3.0 Puerto Rico region
  10. 3.6 43 km N of Suárez, Puerto Rico
  11. 3.6 0 km ENE of Pájaros, Puerto Rico
  12. 3.3 Puerto Rico region
  13. 3.0 1 km E of Jagual, Puerto Rico
  14. 2.9 23 km NNE of Luquillo, Puerto Rico
  15. 3.0 22 km N 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 4.4 on 2018-12-09 — it released about 83 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.