QuakeIndex

Earthquake · reviewed by a seismologist

M 3.4md

4 km SE of G. L. Garcia, Puerto Rico

· 25 km deep · released about 1.6 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Cayey Municipio 9 kmSan Lorenzo Municipio 11 kmCaguas Municipio 12 kmCidra Municipio 13 kmPatillas Municipio 14 kmArroyo Municipio 15 kmGuayama Municipio 16 kmAguas Buenas Municipio 18 kmAibonito Municipio 21 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 3.4 (md)
Depth
25 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Cayey Municipio, 9 km W
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 567 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 1 person has reported feeling it to USGS.

How big was it?

This earthquake released about 1.6 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 6.7 110,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 4,700× the energy of this one
  3. Magna, Utah 2020 M 5.7 3,300× the energy of this one
  4. This earthquake M 3.4 about 1.6 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 3.3× 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 18.1018, -66.0708. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Cayey Municipio, PR 9 km (5 mi) E of here earthquakes near Cayey Municipio
San Lorenzo Municipio, PR 11 km (7 mi) WSW of here earthquakes near San Lorenzo Municipio
Caguas Municipio, PR 12 km (8 mi) S of here earthquakes near Caguas Municipio
Cidra Municipio, PR 13 km (8 mi) SE of here earthquakes near Cidra Municipio
Patillas Municipio, PR 14 km (9 mi) NW of here earthquakes near Patillas Municipio
Arroyo Municipio, PR 15 km (9 mi) NNW of here earthquakes near Arroyo 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. 1.6 2 km S of G. L. Garcia, Puerto Rico
  2. 2.2 1 km W of Naranjito, Puerto Rico
  3. 2.2 3 km ESE of G. L. Garcia, Puerto Rico
  4. 2.9 2 km NW of Orocovis, Puerto Rico
  5. 2.1 3 km WNW of Guayabal, Puerto Rico
  6. 2.4 4 km SW of Las Piedras, Puerto Rico
  7. 2.0 3 km W of Orocovis, Puerto Rico
  8. 2.2 4 km SSW of Las Piedras, Puerto Rico
  9. 2.1 4 km SSW of Las Piedras, Puerto Rico
  10. 2.6 3 km SSW of Las Piedras, Puerto Rico
  11. 2.1 4 km SSE of Juncos, Puerto Rico
  12. 2.5 9 km SE of Emajagua, Puerto Rico
  13. 2.4 5 km SSW of Las Piedras, Puerto Rico
  14. 2.4 3 km SSW of Playita Cortada, Puerto Rico
  15. 2.1 22 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 4.6 on 2016-12-05 — it released about 75 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.