QuakeIndex

Earthquake · reviewed by a seismologist

M 3.6md

Puerto Rico region

· 8.0 km deep · released about 3.7 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Salinas Municipio 5 kmSanta Isabel Municipio 13 kmGuayama Municipio 15 kmCoamo Municipio 22 kmAibonito Municipio 23 kmCayey Municipio 23 kmArroyo Municipio 25 kmJuana Díaz Municipio 25 kmCidra Municipio 30 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 3.6 (md)
Depth
8.0 km below the surface
Felt
6 reports · strongest reported intensity V
Nearest
Salinas Municipio, 5 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1023 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 6 people have reported feeling it to USGS.

How big was it?

This earthquake released about 3.7 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.6 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 46,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 2,100× the energy of this one
  3. Magna, Utah 2020 M 5.7 1,500× the energy of this one
  4. This earthquake M 3.6 about 3.7 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 7.7× 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 17.9258, -66.2696. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Salinas Municipio, PR 5 km (3 mi) S of here earthquakes near Salinas Municipio
Santa Isabel Municipio, PR 13 km (8 mi) ESE of here earthquakes near Santa Isabel Municipio
Guayama Municipio, PR 15 km (9 mi) WSW of here earthquakes near Guayama Municipio
Coamo Municipio, PR 22 km (14 mi) SSE of here earthquakes near Coamo Municipio
Aibonito Municipio, PR 23 km (14 mi) S of here earthquakes near Aibonito Municipio
Cayey Municipio, PR 23 km (15 mi) SSW of here earthquakes near Cayey Municipio

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

Aftershocks so far

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

  1. 2.3 8 km SSW of Orocovis, Puerto Rico
  2. 2.5 17 km S of Central Aguirre, Puerto Rico
  3. 2.1 7 km NNW of Coamo, Puerto Rico
  4. 1.8 0 km NNW of Tallaboa, Puerto Rico
  5. 2.1 5 km SSE of Salinas, Puerto Rico
  6. 2.5 10 km S of Emajagua, Puerto Rico
  7. 2.1 4 km SSE of Salinas, Puerto Rico
  8. 2.5 5 km SW of Central Aguirre, Puerto Rico
  9. 2.5 2 km SSE of Caguas, Puerto Rico
  10. 2.3 6 km SSE of Salinas, Puerto Rico
  11. 2.0 Puerto Rico region
  12. 2.7 Puerto Rico region
  13. 2.1 Puerto Rico region
  14. 3.3 4 km SSE of Salinas, Puerto Rico
  15. 3.2 Puerto Rico region

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 1,000 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.