QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1md

2 km SW of Santa Clara, Puerto Rico

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

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10 km30 km60 km120 km N Cidra Municipio 4 kmAguas Buenas Municipio 6 kmComerío Municipio 9 kmCaguas Municipio 9 kmCayey Municipio 11 kmAibonito Municipio 15 kmNaranjito Municipio 15 kmGuaynabo Municipio 16 kmBayamón Municipio 17 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
77 km below the surface
Felt
no reports yet
Nearest
Cidra Municipio, 4 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 983 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 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 6.7 290,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 13,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 9,100× 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 1.2× 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 18.2028, -66.1403. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Cidra Municipio, PR 4 km (2 mi) NE of here earthquakes near Cidra Municipio
Aguas Buenas Municipio, PR 6 km (4 mi) SSW of here earthquakes near Aguas Buenas Municipio
Comerío Municipio, PR 9 km (5 mi) ESE of here earthquakes near Comerío Municipio
Caguas Municipio, PR 9 km (6 mi) W of here earthquakes near Caguas Municipio
Cayey Municipio, PR 11 km (7 mi) N of here earthquakes near Cayey Municipio
Aibonito Municipio, PR 15 km (10 mi) ENE of here earthquakes near Aibonito Municipio

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

Aftershocks so far

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

  1. 2.3 3 km S of Las Ochenta, Puerto Rico
  2. 2.4 4 km WSW of Central Aguirre, Puerto Rico
  3. 2.5 Puerto Rico region
  4. 2.7 4 km S of Salinas, Puerto Rico
  5. 2.3 4 km SSE of Salinas, Puerto Rico
  6. 1.9 Puerto Rico region
  7. 3.3 Puerto Rico region
  8. 2.4 15 km SSE of Central Aguirre, Puerto Rico
  9. 2.4 15 km S of Central Aguirre, Puerto Rico
  10. 2.7 12 km S of Central Aguirre, Puerto Rico
  11. 2.6 18 km S of Jobos, Puerto Rico
  12. 2.5 Puerto Rico region
  13. 3.0 18 km S of Central Aguirre, Puerto Rico
  14. 2.7 16 km S of Central Aguirre, Puerto Rico
  15. 3.0 16 km S of Central Aguirre, 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 4.6 on 2016-12-05 — it released about 200 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.