QuakeIndex

Earthquake · reviewed by a seismologist

M 2.3md

6 km S of Punta Santiago, Puerto Rico

· 20 km deep · released about 77 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 16 kmMaunabo Municipio 20 kmCeiba Municipio 21 kmJuncos Municipio 21 kmSan Lorenzo Municipio 25 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 2.3 (md)
Depth
20 km below the surface
Felt
no reports yet
Nearest
Humacao Municipio, 5 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1120 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

How big was it?

This earthquake released about 77 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.3 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 200,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 140,000× the energy of this one
  3. Around the size people start to feel M 3.0 12× the energy of this one
  4. This earthquake M 2.3 about 77 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 18.1090, -65.7460. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Humacao Municipio, PR 5 km (3 mi) SE 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 16 km (10 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

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

  1. 2.5 10 km S of Emajagua, Puerto Rico
  2. 3.2 36 km SE of Emajagua, Puerto Rico
  3. 2.5 2 km SSE of Caguas, Puerto Rico
  4. 2.0 Puerto Rico region
  5. 2.8 1 km SSW of Cidra, Puerto Rico
  6. 3.3 4 km ENE of Guaynabo, Puerto Rico
  7. 2.6 Puerto Rico region
  8. 3.1 10 km S of Lamboglia, Puerto Rico
  9. 3.3 25 km SE of El Negro, Puerto Rico
  10. 2.5 Puerto Rico region
  11. 2.5 16 km SE of El Negro, 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 6,200 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.