QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1md

119 km N of San Juan, Puerto Rico

Yes. A magnitude 3.1 earthquake was recorded 119 km N of San Juan, Puerto Rico, at 7:23 pm AST on 5 June 2019 (23:23 UTC), 40 km deep. 1 person has reported feeling it to USGS.

· 40 km deep · released about 1,400 lb of TNT

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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 3.1 (md)
Depth
40 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Dorado Municipio, 121 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2715 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

At this magnitude and depth, people at rest would likely notice it out to about 14 km (9 mi) from the epicentre. Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.

How big was it?

This earthquake released about 1,400 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.1 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 240,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 11,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 7,700× the energy of this one
  4. This earthquake M 3.1 about 1,400 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.5× 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.

For this area

The largest earthquake within 50 km since 2016 was M 4.4 on 2016-10-23 — about 86 times the energy of this one.

Before 2016, the USGS record lists 3 earthquakes of M5 or more within 50 km:

  1. 5.4 106 km N of Brenas, Puerto Rico · 37 km WSW of this epicentre
  2. 5.1 92 km N of Suárez, Puerto Rico · 47 km SE of this epicentre
  3. 5.0 113 km N of Brenas, Puerto Rico · 29 km WSW of this epicentre

Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.

Where

Epicentre 19.5455, -66.0551. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Dorado Municipio, PR 121 km (75 mi) S earthquakes near Dorado Municipio
Barceloneta Municipio, PR 131 km (81 mi) SSW earthquakes near Barceloneta Municipio
Isabela Municipio, PR 155 km (96 mi) SW earthquakes near Isabela Municipio
Aguadilla Municipio, PR 165 km (102 mi) SW earthquakes near Aguadilla Municipio

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

Aftershocks so far

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

  1. 2.5 78 km N of San Juan, Puerto Rico
  2. 2.9 105 km N of San Juan, Puerto Rico
  3. 2.9 88 km N of Suárez, Puerto Rico
  4. 3.2 104 km NNE of Suárez, Puerto Rico
  5. 3.1 113 km N of Suárez, Puerto Rico
  6. 3.0 101 km N of Brenas, Puerto Rico
  7. 2.9 102 km N of Brenas, Puerto Rico
  8. 2.6 100 km N of Brenas, Puerto Rico
  9. 2.7 123 km NNE of Suárez, Puerto Rico
  10. 2.9 127 km N of Brenas, Puerto Rico
  11. 3.0 122 km N of Brenas, Puerto Rico
  12. 2.4 117 km NNE of Suárez, Puerto Rico
  13. 2.9 97 km N of Brenas, Puerto Rico
  14. 2.8 95 km N of Brenas, Puerto Rico
  15. 2.7 103 km N of Suárez, 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.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.