QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1md

13 km S of Arroyo, Puerto Rico

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

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Arroyo Municipio 15 kmGuayama Municipio 17 kmPatillas Municipio 20 kmMaunabo Municipio 25 kmSalinas Municipio 25 kmCayey Municipio 31 kmYabucoa Municipio 33 kmSan Lorenzo Municipio 35 kmSanta Isabel Municipio 36 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
11 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Arroyo Municipio, 15 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 241 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 6.7 290,000× 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 17.8403, -66.0657. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Arroyo Municipio, PR 15 km (9 mi) S of here earthquakes near Arroyo Municipio
Guayama Municipio, PR 17 km (10 mi) SSE of here earthquakes near Guayama Municipio
Patillas Municipio, PR 20 km (12 mi) SSW of here earthquakes near Patillas Municipio
Maunabo Municipio, PR 25 km (16 mi) SW of here earthquakes near Maunabo Municipio
Salinas Municipio, PR 25 km (16 mi) SE of here earthquakes near Salinas Municipio
Cayey Municipio, PR 31 km (19 mi) SSE of here earthquakes near Cayey Municipio

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

Aftershocks so far

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

  1. 2.1 2 km SE of Jobos, Puerto Rico
  2. 2.5 1 km W of Santa Clara, Puerto Rico
  3. 1.5 6 km S of Central Aguirre, Puerto Rico
  4. 2.6 2 km WSW of G. L. Garcia, Puerto Rico
  5. 2.0 2 km SSW of Vázquez, Puerto Rico
  6. 2.0 11 km SSE of Punta Santiago, Puerto Rico
  7. 2.0 0 km WSW of Aguas Buenas, Puerto Rico
  8. 1.9 0 km SW of G. L. Garcia, Puerto Rico
  9. 2.6 26 km SE of El Negro, Puerto Rico
  10. 3.0 30 km SSW of Esperanza, Puerto Rico
  11. 1.6 1 km SW of G. L. Garcia, Puerto Rico
  12. 1.8 7 km ESE of G. L. Garcia, Puerto Rico
  13. 2.4 3 km SSE of Salinas, Puerto Rico
  14. 1.7 1 km WSW of G. L. Garcia, Puerto Rico
  15. 1.7 2 km NW of Las Ollas, 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.