QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1md

25 km SE of Emajagua, Puerto Rico

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

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10 km30 km60 km120 km N Maunabo Municipio 27 kmYabucoa Municipio 28 kmHumacao Municipio 32 kmPatillas Municipio 35 kmArroyo Municipio 39 kmNaguabo Municipio 40 kmVieques Municipio 41 kmLas Piedras Municipio 41 kmSan Lorenzo Municipio 44 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
no reports yet
Nearest
Maunabo Municipio, 27 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1786 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 6.7 270,000× 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 8,500× 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 1.3× 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 17.8560, -65.6966. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Maunabo Municipio, PR 27 km (16 mi) SE of here earthquakes near Maunabo Municipio
Yabucoa Municipio, PR 28 km (18 mi) SE of here earthquakes near Yabucoa Municipio
Humacao Municipio, PR 32 km (20 mi) SSE of here earthquakes near Humacao Municipio
Patillas Municipio, PR 35 km (22 mi) ESE of here earthquakes near Patillas Municipio
Arroyo Municipio, PR 39 km (24 mi) ESE of here earthquakes near Arroyo Municipio
Naguabo Municipio, PR 40 km (25 mi) S of here earthquakes near Naguabo 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. 3.1 5 km ESE of Punta Santiago, Puerto Rico
  2. 2.9 18 km SW of Esperanza, Puerto Rico
  3. 2.9 13 km SE of Esperanza, Puerto Rico
  4. 3.3 27 km SSE of Jobos, Puerto Rico
  5. 2.8 17 km SSE of Esperanza, Puerto Rico
  6. 2.5 23 km S of Arroyo, Puerto Rico
  7. 2.4 7 km SSE of Jobos, Puerto Rico
  8. 2.8 2 km SE of Jobos, Puerto Rico
  9. 2.0 5 km ESE of Jobos, Puerto Rico
  10. 2.1 3 km SSE of Jobos, Puerto Rico
  11. 2.5 2 km SSE of Jobos, Puerto Rico
  12. 2.8 3 km ESE of Jobos, Puerto Rico
  13. 3.0 54 km S of Emajagua, Puerto Rico
  14. 2.3 1 km WNW of Esperanza, Puerto Rico
  15. 2.5 22 km SSW 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 380 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.