QuakeIndex

Earthquake · reviewed by a seismologist

M 3.3md

18 km S of Emajagua, Puerto Rico

· 48 km deep · released about 1.3 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Maunabo Municipio 18 kmPatillas Municipio 22 kmArroyo Municipio 23 kmYabucoa Municipio 25 kmGuayama Municipio 32 kmHumacao Municipio 35 kmSan Lorenzo Municipio 36 kmLas Piedras Municipio 39 kmCayey Municipio 42 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 3.3 (md)
Depth
48 km below the surface
Felt
2 reports · strongest reported intensity III
Nearest
Maunabo Municipio, 18 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1513 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 1.3 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.3 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 130,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 5,800× the energy of this one
  3. Magna, Utah 2020 M 5.7 4,100× the energy of this one
  4. This earthquake M 3.3 about 1.3 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 2.7× 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 17.8358, -65.8756. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Maunabo Municipio, PR 18 km (11 mi) S of here earthquakes near Maunabo Municipio
Patillas Municipio, PR 22 km (14 mi) SSE of here earthquakes near Patillas Municipio
Arroyo Municipio, PR 23 km (14 mi) SE of here earthquakes near Arroyo Municipio
Yabucoa Municipio, PR 25 km (16 mi) S of here earthquakes near Yabucoa Municipio
Guayama Municipio, PR 32 km (20 mi) ESE of here earthquakes near Guayama Municipio
Humacao Municipio, PR 35 km (22 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

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

  1. 2.5 23 km S of Arroyo, Puerto Rico
  2. 2.4 7 km SSE of Jobos, Puerto Rico
  3. 2.8 2 km SE of Jobos, Puerto Rico
  4. 2.0 5 km ESE of Jobos, Puerto Rico
  5. 2.5 8 km SSW of Salinas, Puerto Rico
  6. 2.1 3 km SSE of Jobos, Puerto Rico
  7. 2.5 2 km SSE of Jobos, Puerto Rico
  8. 2.2 0 km N of Salinas, Puerto Rico
  9. 2.8 3 km ESE of Jobos, Puerto Rico
  10. 3.0 54 km S of Emajagua, Puerto Rico
  11. 2.5 22 km SSW of Esperanza, Puerto Rico
  12. 3.0 4 km S of G. L. Garcia, Puerto Rico
  13. 2.3 10 km S of Salinas, Puerto Rico
  14. 2.3 12 km SW of Central Aguirre, Puerto Rico
  15. 1.9 1 km ESE 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 92 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.