QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1md

9 km S of Jobos, Puerto Rico

· 1.1 km deep · released about 1,300 lb of TNT

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10 km30 km60 km120 km N Guayama Municipio 12 kmSalinas Municipio 14 kmArroyo Municipio 18 kmSanta Isabel Municipio 24 kmPatillas Municipio 25 kmCayey Municipio 26 kmAibonito Municipio 30 kmCoamo Municipio 32 kmMaunabo Municipio 33 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
1.1 km below the surface
Felt
no reports yet
Nearest
Guayama Municipio, 12 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1519 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 1,300 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 6.7 260,000× 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 8,200× the energy of this one
  4. This earthquake M 3.1 about 1,300 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.4× 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 17.8742, -66.1805. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Guayama Municipio, PR 12 km (7 mi) SSW of here earthquakes near Guayama Municipio
Salinas Municipio, PR 14 km (9 mi) SE of here earthquakes near Salinas Municipio
Arroyo Municipio, PR 18 km (11 mi) SW of here earthquakes near Arroyo Municipio
Santa Isabel Municipio, PR 24 km (15 mi) ESE of here earthquakes near Santa Isabel Municipio
Patillas Municipio, PR 25 km (15 mi) SW of here earthquakes near Patillas Municipio
Cayey Municipio, PR 26 km (16 mi) S of here earthquakes near Cayey Municipio

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

Aftershocks so far

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

  1. 2.9 3 km SW of Potala Pastillo, Puerto Rico
  2. 3.0 5 km SSW of Potala Pastillo, Puerto Rico
  3. 2.2 4 km SSW of Capitanejo, Puerto Rico
  4. 3.0 5 km SW of Potala Pastillo, Puerto Rico
  5. 3.4 4 km SSW of Potala Pastillo, Puerto Rico
  6. 3.4 5 km SSW of Potala Pastillo, Puerto Rico
  7. 3.6 5 km E of Candelero Arriba, Puerto Rico
  8. 2.2 3 km N of Orocovis, Puerto Rico
  9. 2.3 2 km SE of Lamboglia, Puerto Rico
  10. 2.3 3 km ESE of Salinas, Puerto Rico
  11. 3.0 6 km SSW of Potala Pastillo, Puerto Rico
  12. 1.9 2 km SSE of Lamboglia, Puerto Rico
  13. 2.4 Puerto Rico region
  14. 2.2 5 km SSW of Potala Pastillo, Puerto Rico
  15. 3.0 3 km ESE of Cayey, 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 180 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.