QuakeIndex

Earthquake · reviewed by a seismologist

M 3.5md

3 km S of Animas, Puerto Rico

· 123 km deep · released about 2.8 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Arecibo Municipio 4 kmFlorida Municipio 10 kmBarceloneta Municipio 10 kmManatí Municipio 16 kmHatillo Municipio 17 kmUtuado Municipio 17 kmCiales Municipio 19 kmJayuya Municipio 23 kmCamuy Municipio 24 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 3.5 (md)
Depth
123 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Arecibo Municipio, 4 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1436 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 2.8 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.5 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 61,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 2,700× the energy of this one
  3. Magna, Utah 2020 M 5.7 1,900× the energy of this one
  4. This earthquake M 3.5 about 2.8 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 5.8× 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 18.4163, -66.6401. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Arecibo Municipio, PR 4 km (3 mi) ESE of here earthquakes near Arecibo Municipio
Florida Municipio, PR 10 km (6 mi) WNW of here earthquakes near Florida Municipio
Barceloneta Municipio, PR 10 km (7 mi) SW of here earthquakes near Barceloneta Municipio
Manatí Municipio, PR 16 km (10 mi) WSW of here earthquakes near Manatí Municipio
Hatillo Municipio, PR 17 km (11 mi) E of here earthquakes near Hatillo Municipio
Utuado Municipio, PR 17 km (11 mi) NNE of here earthquakes near Utuado Municipio

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

Aftershocks so far

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

  1. 2.9 22 km N of Arecibo, Puerto Rico
  2. 3.4 1 km SSW of Pájaros, Puerto Rico
  3. 2.1 0 km NW of Guayanilla, Puerto Rico
  4. 2.7 2 km E of Magas Arriba, Puerto Rico
  5. 2.7 2 km ENE of Magas Arriba, Puerto Rico
  6. 2.6 5 km ESE of Tallaboa, Puerto Rico
  7. 2.1 4 km ESE of Tallaboa Alta, Puerto Rico
  8. 2.0 2 km SW of Lares, 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 5.6 on 2020-01-07 — it released about 1,400 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.