QuakeIndex

Earthquake · reviewed by a seismologist

M 2.9md

1 km W of Punta Santiago, Puerto Rico

· 14 km deep · released about 570 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Humacao Municipio 4 kmNaguabo Municipio 6 kmLas Piedras Municipio 12 kmYabucoa Municipio 16 kmJuncos Municipio 17 kmCeiba Municipio 18 kmCanóvanas Municipio 23 kmSan Lorenzo Municipio 23 kmLuquillo Municipio 23 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 2.9 (md)
Depth
14 km below the surface
Felt
no reports yet
Nearest
Humacao Municipio, 4 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1241 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 570 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 27,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 19,000× the energy of this one
  3. Around the size people start to feel M 3.0 1.7× the energy of this one
  4. This earthquake M 2.9 about 570 lb of TNT

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 18.1663, -65.7605. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Humacao Municipio, PR 4 km (3 mi) NE of here earthquakes near Humacao Municipio
Naguabo Municipio, PR 6 km (3 mi) SSW of here earthquakes near Naguabo Municipio
Las Piedras Municipio, PR 12 km (7 mi) E of here earthquakes near Las Piedras Municipio
Yabucoa Municipio, PR 16 km (10 mi) NE of here earthquakes near Yabucoa Municipio
Juncos Municipio, PR 17 km (11 mi) ESE of here earthquakes near Juncos Municipio
Ceiba Municipio, PR 18 km (11 mi) WSW of here earthquakes near Ceiba Municipio

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

Aftershocks so far

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

  1. 3.3 4 km ENE of Guaynabo, Puerto Rico
  2. 2.6 Puerto Rico region
  3. 3.1 10 km S of Lamboglia, Puerto Rico
  4. 3.3 25 km SE of El Negro, Puerto Rico
  5. 2.5 16 km SE of El Negro, Puerto Rico
  6. 2.3 6 km S of Punta Santiago, Puerto Rico
  7. 2.6 Puerto Rico region
  8. 2.6 2 km WNW of Bayamon, Puerto Rico
  9. 2.9 2 km NNE of Parcelas La Milagrosa, Puerto Rico
  10. 2.7 1 km W of Juncos, Puerto Rico
  11. 3.0 Puerto Rico region
  12. 3.0 Puerto Rico region
  13. 2.6 6 km S of Emajagua, Puerto Rico
  14. 2.7 5 km SSE of Esperanza, Puerto Rico
  15. 3.0 1 km E of Jagual, 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 840 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.