QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1md

Puerto Rico region

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

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Humacao Municipio 12 kmYabucoa Municipio 14 kmMaunabo Municipio 18 kmNaguabo Municipio 19 kmLas Piedras Municipio 22 kmCeiba Municipio 26 kmJuncos Municipio 28 kmPatillas Municipio 28 kmSan Lorenzo Municipio 29 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
Humacao Municipio, 12 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1226 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 1,300 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 6.7 250,000× 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 7,900× 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 18.0447, -65.7287. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Humacao Municipio, PR 12 km (7 mi) SSE of here earthquakes near Humacao Municipio
Yabucoa Municipio, PR 14 km (9 mi) E of here earthquakes near Yabucoa Municipio
Maunabo Municipio, PR 18 km (11 mi) ENE of here earthquakes near Maunabo Municipio
Naguabo Municipio, PR 19 km (12 mi) S of here earthquakes near Naguabo Municipio
Las Piedras Municipio, PR 22 km (14 mi) SE of here earthquakes near Las Piedras Municipio
Ceiba Municipio, PR 26 km (16 mi) SSW of here earthquakes near Ceiba Municipio

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

Aftershocks so far

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

  1. 2.5 16 km SE of El Negro, Puerto Rico
  2. 2.3 6 km S of Punta Santiago, Puerto Rico
  3. 2.6 Puerto Rico region
  4. 2.6 2 km WNW of Bayamon, Puerto Rico
  5. 2.7 1 km W of Juncos, Puerto Rico
  6. 3.0 Puerto Rico region
  7. 3.0 Puerto Rico region
  8. 2.6 6 km S of Emajagua, Puerto Rico
  9. 2.7 5 km SSE of Esperanza, Puerto Rico
  10. 3.0 1 km E of Jagual, Puerto Rico
  11. 2.4 23 km SSE of Arroyo, Puerto Rico
  12. 2.7 2 km E of Santa Clara, Puerto Rico
  13. 3.0 1 km ENE of Bayamon, Puerto Rico
  14. 2.2 12 km SSE of Arroyo, Puerto Rico
  15. 2.8 24 km ESE of El Negro, 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 4.8 on 2021-10-08 — it released about 350 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.