QuakeIndex

Earthquake · reviewed by a seismologist

M 3.6md

5 km E of Candelero Arriba, Puerto Rico

· 5.0 km deep · released about 3.7 tons of TNT

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10 km30 km60 km120 km N Humacao Municipio 3 kmYabucoa Municipio 9 kmLas Piedras Municipio 12 kmNaguabo Municipio 13 kmMaunabo Municipio 17 kmJuncos Municipio 18 kmSan Lorenzo Municipio 20 kmCeiba Municipio 24 kmPatillas Municipio 24 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 3.6 (md)
Depth
5.0 km below the surface
Felt
no reports yet
Nearest
Humacao Municipio, 3 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1393 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 3.7 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.6 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 46,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 2,100× the energy of this one
  3. Magna, Utah 2020 M 5.7 1,500× the energy of this one
  4. This earthquake M 3.6 about 3.7 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 7.7× more

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, -65.7886. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Humacao Municipio, PR 3 km (2 mi) S of here earthquakes near Humacao Municipio
Yabucoa Municipio, PR 9 km (6 mi) NE of here earthquakes near Yabucoa Municipio
Las Piedras Municipio, PR 12 km (8 mi) SE of here earthquakes near Las Piedras Municipio
Naguabo Municipio, PR 13 km (8 mi) SSW of here earthquakes near Naguabo Municipio
Maunabo Municipio, PR 17 km (10 mi) NE of here earthquakes near Maunabo Municipio
Juncos Municipio, PR 18 km (11 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

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

  1. 3.1 11 km SSW of Esperanza, Puerto Rico
  2. 2.6 4 km SSE of Arroyo, Puerto Rico
  3. 2.5 Puerto Rico region
  4. 3.4 Puerto Rico region
  5. 3.1 3 km E of Celada, Puerto Rico
  6. 2.7 16 km SSE of Esperanza, Puerto Rico
  7. 2.5 6 km N of Yaurel, Puerto Rico
  8. 2.7 19 km SE of Esperanza, Puerto Rico
  9. 3.4 5 km SSW of Ramos, Puerto Rico
  10. 2.5 Puerto Rico region
  11. 3.1 3 km SSW of Cayey, Puerto Rico
  12. 2.3 Puerto Rico region
  13. 1.9 9 km SSW of Emajagua, Puerto Rico
  14. 3.1 Puerto Rico region
  15. 3.3 15 km S of Esperanza, 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 65 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.