QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1md

24 km SE of El Negro, Puerto Rico

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

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10 km30 km60 km120 km N Maunabo Municipio 26 kmYabucoa Municipio 27 kmHumacao Municipio 29 kmPatillas Municipio 35 kmNaguabo Municipio 36 kmVieques Municipio 36 kmLas Piedras Municipio 39 kmArroyo Municipio 40 kmCeiba Municipio 40 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
4.0 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Maunabo Municipio, 26 km WNW
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 1,400 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 6.7 230,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 10,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 7,400× 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 17.8935, -65.6743. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Maunabo Municipio, PR 26 km (16 mi) ESE of here earthquakes near Maunabo Municipio
Yabucoa Municipio, PR 27 km (17 mi) SE of here earthquakes near Yabucoa Municipio
Humacao Municipio, PR 29 km (18 mi) SSE of here earthquakes near Humacao Municipio
Patillas Municipio, PR 35 km (22 mi) ESE of here earthquakes near Patillas Municipio
Naguabo Municipio, PR 36 km (22 mi) S of here earthquakes near Naguabo Municipio
Vieques Municipio, PR 36 km (23 mi) SW of here earthquakes near Vieques Municipio

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

Aftershocks so far

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

  1. 2.9 25 km SE of Emajagua, Puerto Rico
  2. 3.5 14 km SSE of Lamboglia, Puerto Rico
  3. 2.8 17 km S of Lamboglia, Puerto Rico
  4. 3.0 28 km SE of El Negro, Puerto Rico
  5. 3.7 4 km E of Punta Santiago, Puerto Rico
  6. 3.1 5 km ESE of Punta Santiago, Puerto Rico
  7. 2.9 18 km SW of Esperanza, Puerto Rico
  8. 2.9 13 km SE of Esperanza, Puerto Rico
  9. 2.8 17 km SSE of Esperanza, Puerto Rico
  10. 2.5 23 km S of Arroyo, Puerto Rico
  11. 2.4 7 km SSE of Jobos, Puerto Rico
  12. 2.0 5 km ESE of Jobos, Puerto Rico
  13. 2.8 3 km ESE of Jobos, Puerto Rico
  14. 3.0 54 km S of Emajagua, Puerto Rico
  15. 2.3 1 km WNW of Esperanza, 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 330 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.