QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1md

3 km N of Olimpo, Puerto Rico

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

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10 km30 km60 km120 km N Guayama Municipio 8 kmCayey Municipio 9 kmArroyo Municipio 9 kmPatillas Municipio 13 kmCidra Municipio 17 kmSan Lorenzo Municipio 18 kmSalinas Municipio 18 kmAibonito Municipio 20 kmCaguas Municipio 20 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
13 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Guayama Municipio, 8 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1513 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 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 6.7 280,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 12,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 8,800× 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 1.3× 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 18.0350, -66.1022. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Guayama Municipio, PR 8 km (5 mi) NNE of here earthquakes near Guayama Municipio
Cayey Municipio, PR 9 km (6 mi) SE of here earthquakes near Cayey Municipio
Arroyo Municipio, PR 9 km (6 mi) NW of here earthquakes near Arroyo Municipio
Patillas Municipio, PR 13 km (8 mi) WNW of here earthquakes near Patillas Municipio
Cidra Municipio, PR 17 km (10 mi) SSE of here earthquakes near Cidra Municipio
San Lorenzo Municipio, PR 18 km (11 mi) SW of here earthquakes near San Lorenzo 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. 2.2 13 km S of Jauca, Puerto Rico
  2. 2.9 14 km S of Jauca, Puerto Rico
  3. 3.3 15 km S of Jauca, Puerto Rico
  4. 3.3 1 km SE of Toa Baja, Puerto Rico
  5. 2.5 23 km S of Arroyo, Puerto Rico
  6. 2.4 7 km SSE of Jobos, Puerto Rico
  7. 2.8 2 km SE of Jobos, Puerto Rico
  8. 2.0 5 km ESE of Jobos, Puerto Rico
  9. 2.5 8 km SSW of Salinas, Puerto Rico
  10. 2.1 3 km SSE of Jobos, Puerto Rico
  11. 2.6 4 km E of Palmarejo, Puerto Rico
  12. 2.5 2 km SSE of Jobos, Puerto Rico
  13. 3.1 5 km SSE of Pájaros, Puerto Rico
  14. 2.2 0 km N of Salinas, Puerto Rico
  15. 2.8 3 km ESE of Jobos, 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.