QuakeIndex

Earthquake · reviewed by a seismologist

M 3.7md

26 km SSW of Esperanza, Puerto Rico

· 22 km deep · released about 5.4 tons of TNT

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10 km30 km60 km120 km N Vieques Municipio 31 kmHumacao Municipio 38 kmYabucoa Municipio 38 kmMaunabo Municipio 39 kmNaguabo Municipio 42 kmCeiba Municipio 43 kmPatillas Municipio 48 kmLas Piedras Municipio 48 kmArroyo Municipio 52 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 3.7 (md)
Depth
22 km below the surface
Felt
2 reports · strongest reported intensity III
Nearest
Vieques Municipio, 31 km NNE
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. 2 people have reported feeling it to USGS.

How big was it?

This earthquake released about 5.4 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.7 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 32,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 1,400× the energy of this one
  3. Magna, Utah 2020 M 5.7 1,000× the energy of this one
  4. This earthquake M 3.7 about 5.4 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 11× 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 17.8718, -65.5571. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Vieques Municipio, PR 31 km (19 mi) SSW of here earthquakes near Vieques Municipio
Humacao Municipio, PR 38 km (24 mi) SE of here earthquakes near Humacao Municipio
Yabucoa Municipio, PR 38 km (24 mi) ESE of here earthquakes near Yabucoa Municipio
Maunabo Municipio, PR 39 km (24 mi) ESE of here earthquakes near Maunabo Municipio
Naguabo Municipio, PR 42 km (26 mi) SSE of here earthquakes near Naguabo Municipio
Ceiba Municipio, PR 43 km (27 mi) S of here earthquakes near Ceiba Municipio

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

Aftershocks so far

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

  1. 2.2 6 km SSE of Bajandas, Puerto Rico
  2. 3.3 5 km SSE of Bajandas, Puerto Rico
  3. 3.0 14 km SE of Esperanza, Puerto Rico
  4. 3.0 6 km SSE of Bajandas, Puerto Rico
  5. 2.7 11 km SE of Emajagua, Puerto Rico
  6. 3.0 11 km SE of Esperanza, Puerto Rico
  7. 2.9 26 km SSE of Arroyo, Puerto Rico
  8. 2.8 18 km SSE of Lamboglia, Puerto Rico
  9. 2.8 10 km SW of Esperanza, Puerto Rico
  10. 2.2 0 km SSE of Isabel Segunda, Puerto Rico
  11. 2.5 5 km SE of El Negro, Puerto Rico
  12. 3.3 34 km ESE of Esperanza, Puerto Rico
  13. 3.1 3 km NE of Martorell, Puerto Rico
  14. 3.2 21 km SSE of Lamboglia, Puerto Rico
  15. 3.5 14 km ESE 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 45 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.