QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1md

115 km N of Brenas, Puerto Rico

· 9.8 km deep · released about 1,200 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Dorado Municipio 115 kmVega Baja Municipio 117 kmBarceloneta Municipio 117 kmToa Baja Municipio 118 kmManatí Municipio 119 kmVega Alta Municipio 119 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
9.8 km below the surface
Felt
1 report · strongest reported intensity I
Nearest
Dorado Municipio, 115 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1619 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 1,200 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 6.7 280,000× 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 8,800× the energy of this one
  4. This earthquake M 3.1 about 1,200 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 19.5078, -66.3567. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Dorado Municipio, PR 115 km (72 mi) N of here earthquakes near Dorado Municipio
Vega Baja Municipio, PR 117 km (73 mi) N of here earthquakes near Vega Baja Municipio
Barceloneta Municipio, PR 117 km (73 mi) N of here earthquakes near Barceloneta Municipio
Toa Baja Municipio, PR 118 km (73 mi) N of here earthquakes near Toa Baja Municipio
Manatí Municipio, PR 119 km (74 mi) N of here earthquakes near Manatí Municipio
Vega Alta Municipio, PR 119 km (74 mi) N 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

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

  1. 3.4 122 km N of Brenas, Puerto Rico
  2. 3.3 102 km N of San Juan, Puerto Rico
  3. 3.4 80 km N of Brenas, Puerto Rico
  4. 3.5 80 km N of Tierras Nuevas Poniente, Puerto Rico
  5. 3.1 76 km N of Tierras Nuevas Poniente, Puerto Rico
  6. 3.7 108 km N of Brenas, Puerto Rico
  7. 3.6 100 km N of Brenas, Puerto Rico
  8. 3.5 72 km N of Brenas, Puerto Rico
  9. 3.2 74 km N of Tierras Nuevas Poniente, Puerto Rico
  10. 3.0 70 km N of Brenas, Puerto Rico
  11. 3.4 73 km N of Tierras Nuevas Poniente, Puerto Rico
  12. 3.4 76 km N of Arecibo, Puerto Rico
  13. 3.2 73 km N of Arecibo, Puerto Rico
  14. 3.2 73 km N of Arecibo, Puerto Rico
  15. 3.3 72 km N of Arecibo, 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 99 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.