QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1md

3 km NE of Martorell, Puerto Rico

· 12 km deep · released about 1,400 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Yabucoa Municipio 5 kmLas Piedras Municipio 10 kmHumacao Municipio 11 kmMaunabo Municipio 11 kmSan Lorenzo Municipio 12 kmJuncos Municipio 14 kmPatillas Municipio 16 kmNaguabo Municipio 20 kmCaguas Municipio 22 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
12 km below the surface
Felt
no reports yet
Nearest
Yabucoa Municipio, 5 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 765 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 1,400 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 6.7 240,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 11,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 7,700× the energy of this one
  4. This earthquake M 3.1 about 1,400 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.5× 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 18.1001, -65.8790. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Yabucoa Municipio, PR 5 km (3 mi) NNW of here earthquakes near Yabucoa Municipio
Las Piedras Municipio, PR 10 km (6 mi) S of here earthquakes near Las Piedras Municipio
Humacao Municipio, PR 11 km (7 mi) WSW of here earthquakes near Humacao Municipio
Maunabo Municipio, PR 11 km (7 mi) N of here earthquakes near Maunabo Municipio
San Lorenzo Municipio, PR 12 km (7 mi) ESE of here earthquakes near San Lorenzo Municipio
Juncos Municipio, PR 14 km (9 mi) SSE of here earthquakes near Juncos Municipio

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

Aftershocks so far

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

  1. 2.0 6 km NW of Palomas, Puerto Rico
  2. 2.8 6 km WNW of Palomas, Puerto Rico
  3. 2.2 7 km NW of Palomas, Puerto Rico
  4. 2.4 11 km SSE of Punta Santiago, Puerto Rico
  5. 3.0 0 km WNW of Candelaria, Puerto Rico
  6. 2.4 7 km S of Emajagua, Puerto Rico
  7. 2.3 6 km WNW of Palomas, Puerto Rico
  8. 2.7 10 km SSE of Esperanza, Puerto Rico
  9. 2.8 1 km SE of Naranjito, Puerto Rico
  10. 3.7 25 km SE of Emajagua, Puerto Rico
  11. 3.2 11 km S of Esperanza, Puerto Rico
  12. 2.3 10 km SSE of Lamboglia, Puerto Rico
  13. 2.7 5 km SSE of G. L. Garcia, Puerto Rico
  14. 2.6 1 km NW of El Negro, Puerto Rico
  15. 2.3 0 km ENE of Parcelas La Milagrosa, 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 170 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.