QuakeIndex

Earthquake · reviewed by a seismologist

M 3.4md

105 km N of San Juan, Puerto Rico

· 13 km deep · released about 2.1 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Loíza Municipio 108 kmDorado Municipio 109 kmToa Baja Municipio 109 kmCataño Municipio 109 kmSan Juan Municipio 111 kmCarolina Municipio 113 kmVega Alta Municipio 116 kmVega Baja Municipio 116 kmRío Grande Municipio 117 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
13 km below the surface
Felt
2 reports · strongest reported intensity V
Nearest
Loíza Municipio, 108 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2031 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 2 people have reported feeling it to USGS.

How big was it?

This earthquake released about 2.1 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.4 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 80,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 3,600× the energy of this one
  3. Magna, Utah 2020 M 5.7 2,500× the energy of this one
  4. This earthquake M 3.4 about 2.1 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 4.4× 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 19.4140, -65.9658. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Loíza Municipio, PR 108 km (67 mi) N of here earthquakes near Loíza Municipio
Dorado Municipio, PR 109 km (68 mi) NNE of here earthquakes near Dorado Municipio
Toa Baja Municipio, PR 109 km (68 mi) NNE of here earthquakes near Toa Baja Municipio
Cataño Municipio, PR 109 km (68 mi) N of here earthquakes near Cataño Municipio
San Juan Municipio, PR 111 km (69 mi) N of here earthquakes near San Juan Municipio
Carolina Municipio, PR 113 km (70 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

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

  1. 3.6 121 km N of San Juan, Puerto Rico
  2. 3.3 75 km N of San Juan, Puerto Rico
  3. 3.5 93 km N of Suárez, Puerto Rico
  4. 3.3 81 km NNE of San Juan, Puerto Rico
  5. 3.2 74 km N of San Juan, Puerto Rico
  6. 3.8 117 km N of Brenas, Puerto Rico
  7. 3.5 83 km N of San Juan, Puerto Rico
  8. 3.7 134 km N of San Juan, Puerto Rico
  9. 3.2 72 km N of San Juan, Puerto Rico
  10. 3.3 69 km N of Brenas, Puerto Rico
  11. 3.4 85 km N of San Juan, Puerto Rico
  12. 3.2 80 km N of San Juan, Puerto Rico
  13. 3.5 79 km N of San Juan, Puerto Rico
  14. 3.6 82 km N of San Juan, Puerto Rico
  15. 3.5 113 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 2016-10-23 — it released about 29 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.