QuakeIndex

Earthquake · reviewed by a seismologist

M 3.2md

0 km ENE of Cidra, Puerto Rico

· 78 km deep · released about 1,900 lb of TNT

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10 km30 km60 km120 km N Cidra Municipio 1 kmCayey Municipio 8 kmComerío Municipio 9 kmAguas Buenas Municipio 9 kmCaguas Municipio 12 kmAibonito Municipio 13 kmNaranjito Municipio 16 kmBarranquitas Municipio 16 kmGuaynabo Municipio 19 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 3.2 (md)
Depth
78 km below the surface
Felt
4 reports · strongest reported intensity II
Nearest
Cidra Municipio, 1 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 681 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 4 people have reported feeling it to USGS.

How big was it?

This earthquake released about 1,900 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.2 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 180,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 7,900× the energy of this one
  3. Magna, Utah 2020 M 5.7 5,600× the energy of this one
  4. This earthquake M 3.2 about 1,900 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 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 18.1787, -66.1552. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Cidra Municipio, PR 1 km (1 mi) NE of here earthquakes near Cidra Municipio
Cayey Municipio, PR 8 km (5 mi) N of here earthquakes near Cayey Municipio
Comerío Municipio, PR 9 km (5 mi) SE of here earthquakes near Comerío Municipio
Aguas Buenas Municipio, PR 9 km (6 mi) SSW of here earthquakes near Aguas Buenas Municipio
Caguas Municipio, PR 12 km (7 mi) WSW of here earthquakes near Caguas Municipio
Aibonito Municipio, PR 13 km (8 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

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

  1. 2.5 18 km S of Lamboglia, Puerto Rico
  2. 3.0 18 km S of Lamboglia, Puerto Rico
  3. 3.0 11 km NNW of San Juan, Puerto Rico
  4. 2.9 13 km SW of Santa Isabel, Puerto Rico
  5. 1.9 2 km W of Potala Pastillo, Puerto Rico
  6. 2.2 2 km E of Cayey, Puerto Rico
  7. 2.0 4 km NNW of Jobos, Puerto Rico
  8. 2.3 11 km SSE of Arroyo, Puerto Rico
  9. 2.5 5 km NNW of Jagual, Puerto Rico
  10. 1.8 4 km NNW of Yaurel, Puerto Rico
  11. 2.8 0 km SW of Santa Isabel, Puerto Rico
  12. 2.2 2 km WSW of Potala Pastillo, Puerto Rico
  13. 3.2 3 km SE of Bartolo, Puerto Rico
  14. 2.4 5 km SSE of Emajagua, Puerto Rico
  15. 2.9 9 km NNE of Brenas, 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 130 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.