QuakeIndex

Earthquake · reviewed by a seismologist

M 2.7md

18 km SE of El Negro, Puerto Rico

· 9.6 km deep · released about 380 lb of TNT

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10 km30 km60 km120 km N Yabucoa Municipio 21 kmMaunabo Municipio 21 kmHumacao Municipio 23 kmNaguabo Municipio 30 kmPatillas Municipio 31 kmLas Piedras Municipio 33 kmVieques Municipio 35 kmArroyo Municipio 36 kmCeiba Municipio 36 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
9.6 km below the surface
Felt
no reports yet
Nearest
Yabucoa Municipio, 21 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 439 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 380 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 40,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 29,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.5× the energy of this one
  4. This earthquake M 2.7 about 380 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 17.9395, -65.7042. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Yabucoa Municipio, PR 21 km (13 mi) SE of here earthquakes near Yabucoa Municipio
Maunabo Municipio, PR 21 km (13 mi) ESE of here earthquakes near Maunabo Municipio
Humacao Municipio, PR 23 km (15 mi) SSE of here earthquakes near Humacao Municipio
Naguabo Municipio, PR 30 km (19 mi) S of here earthquakes near Naguabo Municipio
Patillas Municipio, PR 31 km (19 mi) ESE of here earthquakes near Patillas Municipio
Las Piedras Municipio, PR 33 km (20 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

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

  1. 3.1 30 km SE of Emajagua, Puerto Rico
  2. 3.0 19 km WSW of Esperanza, Puerto Rico
  3. 2.0 4 km WNW of Yaurel, Puerto Rico
  4. 3.1 9 km SSE of Daguao, Puerto Rico
  5. 2.6 2 km SW of Campo Rico, Puerto Rico
  6. 1.9 4 km SE of Jagual, Puerto Rico
  7. 2.9 29 km SSW of Esperanza, Puerto Rico
  8. 2.3 2 km S of G. L. Garcia, Puerto Rico
  9. 1.8 3 km NNE of Jobos, Puerto Rico
  10. 1.9 3 km E of G. L. Garcia, Puerto Rico
  11. 2.0 9 km S of Emajagua, Puerto Rico
  12. 2.7 4 km ESE of Jagual, Puerto Rico
  13. 1.8 1 km WSW of G. L. Garcia, Puerto Rico
  14. 3.2 9 km WSW of Esperanza, Puerto Rico
  15. 2.7 1 km E of Palmas, 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 1,300 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.