QuakeIndex

Earthquake · reviewed by a seismologist

M 2.7md

11 km SE of Emajagua, Puerto Rico

· 7.9 km deep · released about 310 lb of TNT

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10 km30 km60 km120 km N Maunabo Municipio 13 kmYabucoa Municipio 15 kmPatillas Municipio 21 kmHumacao Municipio 22 kmArroyo Municipio 26 kmLas Piedras Municipio 29 kmSan Lorenzo Municipio 30 kmNaguabo Municipio 31 kmJuncos Municipio 34 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 2.7 (md)
Depth
7.9 km below the surface
Felt
no reports yet
Nearest
Maunabo Municipio, 13 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 795 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 310 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 50,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 35,000× the energy of this one
  3. Around the size people start to feel M 3.0 3.1× the energy of this one
  4. This earthquake M 2.7 about 310 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 17.9412, -65.7943. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Maunabo Municipio, PR 13 km (8 mi) ESE of here earthquakes near Maunabo Municipio
Yabucoa Municipio, PR 15 km (9 mi) SSE of here earthquakes near Yabucoa Municipio
Patillas Municipio, PR 21 km (13 mi) ESE of here earthquakes near Patillas Municipio
Humacao Municipio, PR 22 km (13 mi) S of here earthquakes near Humacao Municipio
Arroyo Municipio, PR 26 km (16 mi) E of here earthquakes near Arroyo Municipio
Las Piedras Municipio, PR 29 km (18 mi) SSE of here earthquakes near Las Piedras Municipio

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

Aftershocks so far

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

  1. 1.9 3 km WNW of Jobos, Puerto Rico
  2. 2.2 20 km SE of El Negro, Puerto Rico
  3. 2.1 8 km S of Lamboglia, Puerto Rico
  4. 2.1 1 km ESE of Parcelas La Milagrosa, Puerto Rico
  5. 3.5 4 km ESE of G. L. Garcia, Puerto Rico
  6. 2.2 1 km SSW of G. L. Garcia, Puerto Rico
  7. 2.1 1 km NW of Humacao, Puerto Rico
  8. 3.4 4 km SE of G. L. Garcia, Puerto Rico
  9. 2.8 4 km WNW of Candelero Arriba, Puerto Rico
  10. 3.0 6 km E of Esperanza, Puerto Rico
  11. 2.0 3 km E of Santa Clara, Puerto Rico
  12. 2.5 18 km S of Lamboglia, Puerto Rico
  13. 3.0 18 km S of Lamboglia, Puerto Rico
  14. 2.7 29 km SSW of Esperanza, Puerto Rico
  15. 2.1 24 km S of Lamboglia, 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 1,600 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.