QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1md

19 km NNE of San Juan, Puerto Rico

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

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10 km30 km60 km120 km N Cataño Municipio 23 kmSan Juan Municipio 24 kmToa Baja Municipio 24 kmLoíza Municipio 24 kmDorado Municipio 28 kmCarolina Municipio 28 kmGuaynabo Municipio 33 kmBayamón Municipio 34 kmTrujillo Alto Municipio 34 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
104 km below the surface
Felt
no reports yet
Nearest
Cataño Municipio, 23 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1776 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 1,400 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 6.7 240,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 11,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 7,700× 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 18.6338, -66.0603. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Cataño Municipio, PR 23 km (14 mi) NNE of here earthquakes near Cataño Municipio
San Juan Municipio, PR 24 km (15 mi) N of here earthquakes near San Juan Municipio
Toa Baja Municipio, PR 24 km (15 mi) NE of here earthquakes near Toa Baja Municipio
Loíza Municipio, PR 24 km (15 mi) NNW of here earthquakes near Loíza Municipio
Dorado Municipio, PR 28 km (17 mi) NE of here earthquakes near Dorado Municipio
Carolina Municipio, PR 28 km (17 mi) NNW of here earthquakes near Carolina Municipio

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

Aftershocks so far

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

  1. 3.4 28 km NNE of Vieques, Puerto Rico
  2. 3.6 2 km ESE of Pájaros, Puerto Rico
  3. 2.9 47 km N of Suárez, Puerto Rico
  4. 3.4 50 km N of Brenas, Puerto Rico
  5. 3.0 2 km SW of Canovanas, Puerto Rico
  6. 2.7 0 km NW of Aguas Buenas, Puerto Rico
  7. 3.5 57 km N of San Juan, Puerto Rico
  8. 2.8 12 km N of San Juan, Puerto Rico
  9. 3.3 40 km NNE of Vieques, Puerto Rico
  10. 2.9 0 km WNW of Aguas Buenas, Puerto Rico
  11. 3.1 13 km N of Levittown, Puerto Rico
  12. 3.0 35 km N of Tierras Nuevas Poniente, Puerto Rico
  13. 2.8 5 km SSE of Corozal, Puerto Rico
  14. 3.2 3 km S of Guaynabo, Puerto Rico
  15. 3.2 38 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 4.8 on 2017-08-18 — it released about 340 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.