QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1md

32 km N of San Juan, Puerto Rico

· 38 km deep · released about 1,300 lb of TNT

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10 km30 km60 km120 km N Toa Baja Municipio 34 kmDorado Municipio 34 kmCataño Municipio 35 kmSan Juan Municipio 38 kmLoíza Municipio 40 kmVega Alta Municipio 41 kmVega Baja Municipio 43 kmCarolina Municipio 44 kmToa Alta Municipio 45 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
38 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Toa Baja Municipio, 34 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1510 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 1,300 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 6.7 270,000× 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 8,500× the energy of this one
  4. This earthquake M 3.1 about 1,300 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 18.7558, -66.1395. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Toa Baja Municipio, PR 34 km (21 mi) N of here earthquakes near Toa Baja Municipio
Dorado Municipio, PR 34 km (21 mi) NNE of here earthquakes near Dorado Municipio
Cataño Municipio, PR 35 km (22 mi) N of here earthquakes near Cataño Municipio
San Juan Municipio, PR 38 km (24 mi) NNW of here earthquakes near San Juan Municipio
Loíza Municipio, PR 40 km (25 mi) NNW of here earthquakes near Loíza Municipio
Vega Alta Municipio, PR 41 km (26 mi) NNE of here earthquakes near Vega Alta Municipio

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

Aftershocks so far

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

  1. 3.3 66 km N of Brenas, Puerto Rico
  2. 3.0 73 km N of San Juan, Puerto Rico
  3. 3.4 49 km N of Tierras Nuevas Poniente, Puerto Rico
  4. 3.0 11 km NNW of Brenas, Puerto Rico
  5. 2.8 36 km NNE of Arecibo, Puerto Rico
  6. 2.8 5 km NNW of Dorado, Puerto Rico
  7. 3.4 75 km N of Brenas, Puerto Rico
  8. 3.6 1 km NNW of San José, Puerto Rico
  9. 3.8 5 km ENE of San Juan, Puerto Rico
  10. 3.3 72 km N of Brenas, Puerto Rico
  11. 3.2 2 km ESE of Mucarabones, Puerto Rico
  12. 3.2 17 km N of Tierras Nuevas Poniente, Puerto Rico
  13. 3.0 4 km NNW of Vega Baja, Puerto Rico
  14. 3.2 71 km N of Brenas, Puerto Rico
  15. 3.2 3 km ENE of Guaynabo, 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 380 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.