QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1md

9 km SSE of Daguao, Puerto Rico

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

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10 km30 km60 km120 km N Naguabo Municipio 11 kmCeiba Municipio 13 kmHumacao Municipio 14 kmLas Piedras Municipio 23 kmYabucoa Municipio 23 kmVieques Municipio 24 kmLuquillo Municipio 25 kmFajardo Municipio 28 kmJuncos Municipio 28 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
130 km below the surface
Felt
no reports yet
Nearest
Naguabo Municipio, 11 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 238 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 1,200 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 18.1465, -65.6590. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Naguabo Municipio, PR 11 km (7 mi) SE of here earthquakes near Naguabo Municipio
Ceiba Municipio, PR 13 km (8 mi) SSW of here earthquakes near Ceiba Municipio
Humacao Municipio, PR 14 km (8 mi) E of here earthquakes near Humacao Municipio
Las Piedras Municipio, PR 23 km (14 mi) ESE of here earthquakes near Las Piedras Municipio
Yabucoa Municipio, PR 23 km (14 mi) ENE of here earthquakes near Yabucoa Municipio
Vieques Municipio, PR 24 km (15 mi) W of here earthquakes near Vieques Municipio

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

Aftershocks so far

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

  1. 2.5 14 km N of Isabel Segunda, Puerto Rico
  2. 3.0 6 km SE of Isabel Segunda, Puerto Rico
  3. 2.0 2 km N of Olimpo, Puerto Rico
  4. 2.6 14 km SE of Esperanza, Puerto Rico
  5. 2.4 7 km WNW of Esperanza, Puerto Rico
  6. 2.7 28 km SSW of Esperanza, Puerto Rico
  7. 2.4 3 km E of G. L. Garcia, Puerto Rico
  8. 2.1 7 km SSW of Jagual, Puerto Rico
  9. 3.0 14 km SE of Isabel Segunda, Puerto Rico
  10. 1.9 11 km S of Emajagua, Puerto Rico
  11. 2.6 15 km WSW of Esperanza, Puerto Rico
  12. 2.5 19 km S of Esperanza, Puerto Rico
  13. 2.5 11 km S of Esperanza, Puerto Rico
  14. 2.7 21 km SSE of Emajagua, Puerto Rico
  15. 2.1 8 km SE of Emajagua, 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 410 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.