QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8md

5 km SSE of Bajandas, Puerto Rico

· 10 km deep · released about 530 lb of TNT

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10 km30 km60 km120 km N Humacao Municipio 4 kmNaguabo Municipio 11 kmYabucoa Municipio 12 kmLas Piedras Municipio 14 kmMaunabo Municipio 19 kmJuncos Municipio 20 kmCeiba Municipio 22 kmSan Lorenzo Municipio 23 kmPatillas Municipio 27 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 2.8 (md)
Depth
10 km below the surface
Felt
no reports yet
Nearest
Humacao Municipio, 4 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 749 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 530 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 29,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 20,000× the energy of this one
  3. Around the size people start to feel M 3.0 1.8× the energy of this one
  4. This earthquake M 2.8 about 530 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 18.1118, -65.7618. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Humacao Municipio, PR 4 km (2 mi) SE of here earthquakes near Humacao Municipio
Naguabo Municipio, PR 11 km (7 mi) SSW of here earthquakes near Naguabo Municipio
Yabucoa Municipio, PR 12 km (7 mi) ENE of here earthquakes near Yabucoa Municipio
Las Piedras Municipio, PR 14 km (9 mi) SE of here earthquakes near Las Piedras Municipio
Maunabo Municipio, PR 19 km (12 mi) NE of here earthquakes near Maunabo Municipio
Juncos Municipio, PR 20 km (12 mi) SE of here earthquakes near Juncos Municipio

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

Aftershocks so far

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

  1. 2.5 10 km SE of Esperanza, Puerto Rico
  2. 2.4 18 km S of Emajagua, Puerto Rico
  3. 1.9 3 km WNW of Jobos, Puerto Rico
  4. 3.3 7 km ESE of San Juan, Puerto Rico
  5. 2.2 20 km SE of El Negro, Puerto Rico
  6. 2.1 8 km S of Lamboglia, Puerto Rico
  7. 2.1 1 km ESE of Parcelas La Milagrosa, Puerto Rico
  8. 3.5 4 km ESE of G. L. Garcia, Puerto Rico
  9. 2.2 1 km SSW of G. L. Garcia, Puerto Rico
  10. 2.1 1 km NW of Humacao, Puerto Rico
  11. 3.4 4 km SE of G. L. Garcia, Puerto Rico
  12. 2.8 4 km WNW of Candelero Arriba, Puerto Rico
  13. 3.0 6 km E of Esperanza, Puerto Rico
  14. 2.0 3 km E of Santa Clara, Puerto Rico
  15. 2.5 18 km S of Lamboglia, 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 900 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.