QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8md

11 km S of Emajagua, Puerto Rico

· 8.0 km deep · released about 510 lb of TNT

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10 km30 km60 km120 km N Maunabo Municipio 12 kmPatillas Municipio 15 kmArroyo Municipio 18 kmYabucoa Municipio 19 kmGuayama Municipio 27 kmHumacao Municipio 29 kmSan Lorenzo Municipio 29 kmLas Piedras Municipio 33 kmCayey 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 2.8 (md)
Depth
8.0 km below the surface
Felt
no reports yet
Nearest
Maunabo Municipio, 12 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1832 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 510 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 30,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 21,000× the energy of this one
  3. Around the size people start to feel M 3.0 1.9× the energy of this one
  4. This earthquake M 2.8 about 510 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 17.8946, -65.8935. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Maunabo Municipio, PR 12 km (7 mi) S of here earthquakes near Maunabo Municipio
Patillas Municipio, PR 15 km (10 mi) SE of here earthquakes near Patillas Municipio
Arroyo Municipio, PR 18 km (11 mi) ESE of here earthquakes near Arroyo Municipio
Yabucoa Municipio, PR 19 km (12 mi) S of here earthquakes near Yabucoa Municipio
Guayama Municipio, PR 27 km (17 mi) ESE of here earthquakes near Guayama Municipio
Humacao Municipio, PR 29 km (18 mi) SSW of here earthquakes near Humacao Municipio

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

Aftershocks so far

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

  1. 2.3 2 km E of Central Aguirre, Puerto Rico
  2. 3.0 2 km N of Yaurel, Puerto Rico
  3. 1.8 19 km SW of Esperanza, Puerto Rico
  4. 2.8 0 km SW of Pastos, Puerto Rico
  5. 2.1 5 km SSE of Palmas, Puerto Rico
  6. 3.1 3 km N of Olimpo, Puerto Rico
  7. 1.9 0 km E of Salinas, Puerto Rico
  8. 2.4 1 km SSE of Salinas, Puerto Rico
  9. 3.0 0 km W of Sumidero, Puerto Rico
  10. 2.5 23 km SW of Esperanza, Puerto Rico
  11. 2.3 13 km SSE of Esperanza, Puerto Rico
  12. 2.7 6 km SSE of Salinas, Puerto Rico
  13. 2.6 6 km SSE of Salinas, Puerto Rico
  14. 2.2 6 km SSE of Salinas, Puerto Rico
  15. 2.3 6 km SSE of Salinas, 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 4.6 on 2016-12-05 — it released about 470 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.