QuakeIndex

Earthquake · reviewed by a seismologist

M 3.6md

1 km NNW of San José, Puerto Rico

· 112 km deep · released about 3.8 tons of TNT

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10 km30 km60 km120 km N Toa Alta Municipio 5 kmDorado Municipio 8 kmVega Alta Municipio 9 kmToa Baja Municipio 9 kmBayamón Municipio 12 kmCataño Municipio 13 kmNaranjito Municipio 13 kmCorozal Municipio 13 kmVega Baja Municipio 15 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
112 km below the surface
Felt
no reports yet
Nearest
Toa Alta Municipio, 5 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1412 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 3.8 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 45,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 2,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 1,400× the energy of this one
  4. This earthquake M 3.6 about 3.8 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 7.9× 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 18.4066, -66.2608. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Toa Alta Municipio, PR 5 km (3 mi) NNW of here earthquakes near Toa Alta Municipio
Dorado Municipio, PR 8 km (5 mi) S of here earthquakes near Dorado Municipio
Vega Alta Municipio, PR 9 km (5 mi) ESE of here earthquakes near Vega Alta Municipio
Toa Baja Municipio, PR 9 km (6 mi) SW of here earthquakes near Toa Baja Municipio
Bayamón Municipio, PR 12 km (7 mi) WNW of here earthquakes near Bayamón Municipio
Cataño Municipio, PR 13 km (8 mi) WSW of here earthquakes near Cataño Municipio

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

Aftershocks so far

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

  1. 3.3 5 km NW of Aguas Buenas, Puerto Rico
  2. 2.5 7 km ENE of Jayuya, Puerto Rico
  3. 3.0 11 km NNW of Brenas, Puerto Rico
  4. 2.8 5 km NNW of Dorado, Puerto Rico
  5. 2.2 3 km N of Orocovis, Puerto Rico
  6. 2.3 3 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 4.4 on 2018-12-09 — it released about 16 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.