QuakeIndex

Earthquake · reviewed by a seismologist

M 3.6md

108 km NNE of San Juan, Puerto Rico

· 50 km deep · released about 3.8 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Loíza Municipio 109 kmCataño Municipio 112 kmToa Baja Municipio 113 kmSan Juan Municipio 113 kmDorado Municipio 113 kmCarolina Municipio 114 kmRío Grande Municipio 116 kmLuquillo Municipio 118 kmFajardo Municipio 118 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 3.6 (md)
Depth
50 km below the surface
Felt
no reports yet
Nearest
Loíza Municipio, 109 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 887 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 3.8 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.6 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 45,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 2,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 1,400× the energy of this one
  4. This earthquake M 3.6 about 3.8 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 7.9× 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 19.4193, -65.8626. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Loíza Municipio, PR 109 km (67 mi) N of here earthquakes near Loíza Municipio
Cataño Municipio, PR 112 km (70 mi) NNE of here earthquakes near Cataño Municipio
Toa Baja Municipio, PR 113 km (70 mi) NNE of here earthquakes near Toa Baja Municipio
San Juan Municipio, PR 113 km (70 mi) N of here earthquakes near San Juan Municipio
Dorado Municipio, PR 113 km (70 mi) NNE of here earthquakes near Dorado Municipio
Carolina Municipio, PR 114 km (71 mi) N of here earthquakes near Carolina Municipio

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

Aftershocks so far

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

  1. 3.2 99 km N of Brenas, Puerto Rico
  2. 3.6 132 km NNE of Vieques, Puerto Rico
  3. 3.5 136 km NNE of Vieques, Puerto Rico
  4. 3.8 135 km NNE of Vieques, Puerto Rico
  5. 3.1 69 km NNE of San Juan, Puerto Rico
  6. 3.4 67 km N of San Juan, Puerto Rico
  7. 3.3 67 km N of San Juan, Puerto Rico
  8. 3.7 123 km NNE of Vieques, Puerto Rico
  9. 3.7 87 km NNE of Vieques, Puerto Rico
  10. 3.7 86 km NNE of Vieques, Puerto Rico
  11. 3.4 130 km NNE of Vieques, Puerto Rico
  12. 3.3 119 km N of San Juan, Puerto Rico
  13. 4.0 110 km N of Brenas, Puerto Rico
  14. 3.1 73 km NNE of San Juan, Puerto Rico
  15. 3.4 69 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 4.3 on 2022-12-25 — it released about 13 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.