QuakeIndex

Earthquake · reviewed by a seismologist

M 3.4md

99 km N of San Juan, Puerto Rico

· 32 km deep · released about 1.6 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Dorado Municipio 102 kmLoíza Municipio 102 kmToa Baja Municipio 102 kmCataño Municipio 103 kmSan Juan Municipio 104 kmCarolina Municipio 107 kmVega Alta Municipio 108 kmVega Baja Municipio 108 kmRío Grande Municipio 112 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 3.4 (md)
Depth
32 km below the surface
Felt
no reports yet
Nearest
Dorado Municipio, 102 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 319 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 1.6 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.3 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 110,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 4,700× the energy of this one
  3. Magna, Utah 2020 M 5.7 3,300× the energy of this one
  4. This earthquake M 3.4 about 1.6 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 3.3× 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 19.3588, -66.0158. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Dorado Municipio, PR 102 km (63 mi) NNE of here earthquakes near Dorado Municipio
Loíza Municipio, PR 102 km (63 mi) N of here earthquakes near Loíza Municipio
Toa Baja Municipio, PR 102 km (63 mi) N of here earthquakes near Toa Baja Municipio
Cataño Municipio, PR 103 km (64 mi) N of here earthquakes near Cataño Municipio
San Juan Municipio, PR 104 km (65 mi) N of here earthquakes near San Juan Municipio
Carolina Municipio, PR 107 km (67 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

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

  1. 3.4 84 km NNE of Vieques, Puerto Rico
  2. 3.6 124 km N of Brenas, Puerto Rico
  3. 3.1 59 km N of Loíza, Puerto Rico
  4. 3.0 76 km N of Brenas, Puerto Rico
  5. 3.6 77 km N of San Juan, Puerto Rico
  6. 3.3 108 km N of San Juan, Puerto Rico
  7. 3.1 57 km N of Brenas, Puerto Rico
  8. 3.1 110 km N of San Juan, Puerto Rico
  9. 3.4 112 km NNE of Vieques, Puerto Rico
  10. 2.6 103 km NNE of Suárez, Puerto Rico
  11. 3.6 121 km NNE of Suárez, Puerto Rico
  12. 3.5 118 km N of Brenas, Puerto Rico
  13. 3.3 89 km N of Suárez, Puerto Rico
  14. 3.0 62 km N of Brenas, Puerto Rico
  15. 3.2 98 km N of Suárez, 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 2016-10-23 — it released about 38 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.