QuakeIndex

Earthquake · reviewed by a seismologist

M 3.6md

95 km N of San Juan, Puerto Rico

· 9.0 km deep · released about 3.4 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Dorado Municipio 95 kmToa Baja Municipio 97 kmCataño Municipio 98 kmVega Baja Municipio 100 kmLoíza Municipio 101 kmVega Alta Municipio 101 kmSan Juan Municipio 101 kmBarceloneta Municipio 104 kmManatí Municipio 104 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 3.6 (md)
Depth
9.0 km below the surface
Felt
no reports yet
Nearest
Dorado Municipio, 95 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 47 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 3.4 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.6 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 50,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 2,200× the energy of this one
  3. Magna, Utah 2020 M 5.7 1,600× the energy of this one
  4. This earthquake M 3.6 about 3.4 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 7.2× 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 19.3275, -66.1578. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Dorado Municipio, PR 95 km (59 mi) N of here earthquakes near Dorado Municipio
Toa Baja Municipio, PR 97 km (60 mi) N of here earthquakes near Toa Baja Municipio
Cataño Municipio, PR 98 km (61 mi) N of here earthquakes near Cataño Municipio
Vega Baja Municipio, PR 100 km (62 mi) NNE of here earthquakes near Vega Baja Municipio
Loíza Municipio, PR 101 km (63 mi) NNW of here earthquakes near Loíza Municipio
Vega Alta Municipio, PR 101 km (63 mi) N of here earthquakes near Vega Alta Municipio

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

Aftershocks so far

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

  1. 3.1 75 km N of Brenas, Puerto Rico
  2. 3.3 110 km N of Suárez, Puerto Rico
  3. 3.2 93 km N of San Juan, Puerto Rico
  4. 3.7 117 km N of San Juan, Puerto Rico
  5. 2.9 65 km N of Tierras Nuevas Poniente, Puerto Rico
  6. 3.3 80 km N of San Juan, Puerto Rico
  7. 3.4 75 km N of San Juan, Puerto Rico
  8. 3.4 110 km N of Suárez, Puerto Rico
  9. 3.1 63 km N of San Juan, Puerto Rico
  10. 3.3 109 km N of Suárez, Puerto Rico
  11. 3.4 123 km N of Tierras Nuevas Poniente, Puerto Rico
  12. 3.0 70 km N of Tierras Nuevas Poniente, Puerto Rico
  13. 3.3 113 km NNE of San Juan, Puerto Rico
  14. 3.0 71 km N of Tierras Nuevas Poniente, Puerto Rico
  15. 3.1 75 km N of Tierras Nuevas Poniente, 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 2017-08-18 — it released about 70 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.