QuakeIndex

Earthquake · reviewed by a seismologist

M 3.7md

25 km SE of Emajagua, Puerto Rico

· 10 km deep · released about 4.8 tons of TNT

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10 km30 km60 km120 km N Maunabo Municipio 26 kmYabucoa Municipio 28 kmHumacao Municipio 31 kmPatillas Municipio 35 kmNaguabo Municipio 38 kmArroyo Municipio 39 kmVieques Municipio 40 kmLas Piedras Municipio 40 kmSan Lorenzo Municipio 43 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
10 km below the surface
Felt
2 reports · strongest reported intensity IV
Nearest
Maunabo Municipio, 26 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 652 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 4.8 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 35,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 1,600× the energy of this one
  3. Magna, Utah 2020 M 5.7 1,100× the energy of this one
  4. This earthquake M 3.7 about 4.8 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 10× 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 17.8676, -65.6906. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Maunabo Municipio, PR 26 km (16 mi) SE of here earthquakes near Maunabo Municipio
Yabucoa Municipio, PR 28 km (17 mi) SE of here earthquakes near Yabucoa Municipio
Humacao Municipio, PR 31 km (20 mi) SSE of here earthquakes near Humacao Municipio
Patillas Municipio, PR 35 km (22 mi) ESE of here earthquakes near Patillas Municipio
Naguabo Municipio, PR 38 km (24 mi) S of here earthquakes near Naguabo Municipio
Arroyo Municipio, PR 39 km (24 mi) ESE of here earthquakes near Arroyo 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. 2.2 3 km ESE of G. L. Garcia, Puerto Rico
  2. 2.4 4 km SW of Las Piedras, Puerto Rico
  3. 2.5 2 km SE of Esperanza, Puerto Rico
  4. 2.2 4 km SSW of Las Piedras, Puerto Rico
  5. 2.1 4 km SSW of Las Piedras, Puerto Rico
  6. 2.6 3 km SSW of Las Piedras, Puerto Rico
  7. 2.1 4 km SSE of Juncos, Puerto Rico
  8. 2.5 9 km SE of Emajagua, Puerto Rico
  9. 2.4 5 km SSW of Las Piedras, Puerto Rico
  10. 2.1 22 km S of Lamboglia, Puerto Rico
  11. 2.2 9 km S of Emajagua, Puerto Rico
  12. 1.6 2 km SSE of Lamboglia, Puerto Rico
  13. 2.6 37 km S of Esperanza, Puerto Rico
  14. 2.5 18 km WSW of Esperanza, Puerto Rico
  15. 3.0 7 km SE 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 50 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.