QuakeIndex

Earthquake · reviewed by a seismologist

M 2.9md

2 km NNW of Punta Santiago, Puerto Rico

· 14 km deep · released about 700 lb of TNT

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10 km30 km60 km120 km N Naguabo Municipio 4 kmHumacao Municipio 6 kmLas Piedras Municipio 11 kmJuncos Municipio 16 kmCeiba Municipio 17 kmYabucoa Municipio 17 kmCanóvanas Municipio 21 kmLuquillo Municipio 21 kmRío Grande Municipio 21 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
1 report · strongest reported intensity II
Nearest
Naguabo Municipio, 4 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 983 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 700 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 22,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 15,000× the energy of this one
  3. Around the size people start to feel M 3.0 1.4× the energy of this one
  4. This earthquake M 2.9 about 700 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 18.1870, -65.7623. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Naguabo Municipio, PR 4 km (2 mi) SW of here earthquakes near Naguabo Municipio
Humacao Municipio, PR 6 km (4 mi) NNE of here earthquakes near Humacao Municipio
Las Piedras Municipio, PR 11 km (7 mi) E of here earthquakes near Las Piedras Municipio
Juncos Municipio, PR 16 km (10 mi) ESE of here earthquakes near Juncos Municipio
Ceiba Municipio, PR 17 km (10 mi) WSW of here earthquakes near Ceiba Municipio
Yabucoa Municipio, PR 17 km (11 mi) NE of here earthquakes near Yabucoa Municipio

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

Aftershocks so far

42 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. 2.9 2 km NNE of Parcelas La Milagrosa, Puerto Rico
  6. 2.7 1 km W of Juncos, Puerto Rico
  7. 3.0 Puerto Rico region
  8. 3.0 Puerto Rico region
  9. 2.6 6 km S of Emajagua, Puerto Rico
  10. 2.7 5 km SSE of Esperanza, Puerto Rico
  11. 3.0 1 km E of Jagual, Puerto Rico
  12. 2.9 23 km NNE of Luquillo, Puerto Rico
  13. 2.7 2 km E of Santa Clara, Puerto Rico
  14. 3.0 1 km ENE of Bayamon, Puerto Rico
  15. 2.2 12 km SSE of Arroyo, 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 680 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.