QuakeIndex

Earthquake · reviewed by a seismologist

M 3.4md

3 km ESE of Salinas, Puerto Rico

· 8.0 km deep · released about 2 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Salinas Municipio 1 kmSanta Isabel Municipio 13 kmGuayama Municipio 13 kmCoamo Municipio 19 kmAibonito Municipio 19 kmCayey Municipio 20 kmArroyo Municipio 23 kmJuana Díaz Municipio 24 kmCidra Municipio 26 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
8.0 km below the surface
Felt
no reports yet
Nearest
Salinas Municipio, 1 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1676 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 2 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 86,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 3,800× the energy of this one
  3. Magna, Utah 2020 M 5.7 2,700× the energy of this one
  4. This earthquake M 3.4 about 2 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 4.1× 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 17.9625, -66.2638. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Salinas Municipio, PR 1 km (1 mi) S of here earthquakes near Salinas Municipio
Santa Isabel Municipio, PR 13 km (8 mi) E of here earthquakes near Santa Isabel Municipio
Guayama Municipio, PR 13 km (8 mi) W of here earthquakes near Guayama Municipio
Coamo Municipio, PR 19 km (12 mi) SSE of here earthquakes near Coamo Municipio
Aibonito Municipio, PR 19 km (12 mi) S of here earthquakes near Aibonito Municipio
Cayey Municipio, PR 20 km (12 mi) SW of here earthquakes near Cayey Municipio

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

Aftershocks so far

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

  1. 2.4 23 km S of Arroyo, Puerto Rico
  2. 2.5 2 km SSE of Tallaboa, Puerto Rico
  3. 3.5 10 km S of Central Aguirre, Puerto Rico
  4. 1.6 2 km SSE of Salinas, Puerto Rico
  5. 3.3 18 km S of Emajagua, Puerto Rico
  6. 3.1 12 km S of Central Aguirre, Puerto Rico
  7. 2.8 10 km S of Central Aguirre, Puerto Rico
  8. 3.2 6 km WNW of Palomas, Puerto Rico
  9. 2.5 3 km NE of Las Ochenta, Puerto Rico
  10. 3.0 3 km N of Tallaboa Alta, Puerto Rico
  11. 2.9 3 km N of Tallaboa Alta, Puerto Rico
  12. 2.5 2 km SSW of Potala Pastillo, Puerto Rico
  13. 2.8 7 km SSE of Tallaboa, Puerto Rico
  14. 2.5 8 km SSE of Tallaboa, Puerto Rico
  15. 2.5 2 km SSW of Salinas, 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 1,900 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.