QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8md

5 km S of Punta Santiago, Puerto Rico

· 14 km deep · released about 510 lb of TNT

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10 km30 km60 km120 km N Humacao Municipio 5 kmNaguabo Municipio 11 kmYabucoa Municipio 13 kmLas Piedras Municipio 15 kmMaunabo Municipio 20 kmCeiba Municipio 21 kmJuncos Municipio 21 kmSan Lorenzo Municipio 24 kmPatillas 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 2.8 (md)
Depth
14 km below the surface
Felt
no reports yet
Nearest
Humacao Municipio, 5 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1008 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 510 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 30,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 21,000× the energy of this one
  3. Around the size people start to feel M 3.0 1.9× the energy of this one
  4. This earthquake M 2.8 about 510 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 18.1133, -65.7497. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Humacao Municipio, PR 5 km (3 mi) ESE of here earthquakes near Humacao Municipio
Naguabo Municipio, PR 11 km (7 mi) S of here earthquakes near Naguabo Municipio
Yabucoa Municipio, PR 13 km (8 mi) ENE of here earthquakes near Yabucoa Municipio
Las Piedras Municipio, PR 15 km (9 mi) ESE of here earthquakes near Las Piedras Municipio
Maunabo Municipio, PR 20 km (12 mi) NE of here earthquakes near Maunabo Municipio
Ceiba Municipio, PR 21 km (13 mi) SW of here earthquakes near Ceiba Municipio

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

Aftershocks so far

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

  1. 2.1 12 km S of Arroyo, Puerto Rico
  2. 3.3 1 km WSW of Jagual, Puerto Rico
  3. 2.2 11 km S of Arroyo, Puerto Rico
  4. 2.4 12 km S of Arroyo, Puerto Rico
  5. 2.5 13 km S of Arroyo, Puerto Rico
  6. 2.2 5 km N of Patillas, Puerto Rico
  7. 2.4 5 km WNW of Aguas Buenas, Puerto Rico
  8. 3.1 13 km ESE of El Negro, Puerto Rico
  9. 1.8 2 km E of Cayey, Puerto Rico
  10. 2.9 8 km SE of Esperanza, Puerto Rico
  11. 3.3 13 km SE of Lamboglia, Puerto Rico
  12. 1.5 5 km SE of Cayey, 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 930 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.