QuakeIndex

Earthquake · reviewed by a seismologist

M 3.2md

119 km NNW of San Antonio, Puerto Rico

Yes. A magnitude 3.2 earthquake was recorded 119 km NNW of San Antonio, Puerto Rico, at 4:33 pm AST on 30 September 2017 (20:33 UTC), 10 km deep.

· 10 km deep · released about 1.1 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Aguadilla Municipio 120 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 3.2 (md)
Depth
10 km below the surface
Felt
no reports yet
Nearest
Aguadilla Municipio, 120 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3313 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 47 km (29 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 1.1 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.2 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 160,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 7,200× the energy of this one
  3. Magna, Utah 2020 M 5.7 5,100× the energy of this one
  4. This earthquake M 3.2 about 1.1 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 2.2× 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.

For this area

The largest earthquake within 50 km since 2016 was M 4.2 on 2017-08-27 — about 27 times the energy of this one.

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

  1. 6.0 93 km NNW of San Antonio, Puerto Rico · 26 km SSE of this epicentre
  2. 5.7 88 km N of San Antonio, Puerto Rico · 31 km SSE of this epicentre
  3. 5.1 105 km NNW of San Antonio, Puerto Rico · 22 km SW 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 19.5431, -67.3383. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Aguadilla Municipio, PR 120 km (75 mi) S earthquakes near Aguadilla Municipio
Isabela Municipio, PR 123 km (76 mi) SSE earthquakes near Isabela Municipio
Quebradillas Municipio, PR 127 km (79 mi) SSE earthquakes near Quebradillas Municipio
Barceloneta Municipio, PR 145 km (90 mi) SE earthquakes near Barceloneta Municipio
Dorado Municipio, PR 164 km (102 mi) SE earthquakes near Dorado Municipio

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

Aftershocks so far

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

  1. 3.3 119 km NNW of San Antonio, Puerto Rico
  2. 3.3 73 km NNW of San Antonio, Puerto Rico
  3. 3.4 131 km NE of Punta Cana, Dominican Republic
  4. 3.2 80 km N of San Antonio, Puerto Rico
  5. 3.1 150 km NNW of San Antonio, Puerto Rico
  6. 3.4 138 km NNW of San Antonio, Puerto Rico
  7. 3.4 119 km NE of Punta Cana, Dominican Republic
  8. 3.1 135 km NE of Punta Cana, Dominican Republic
  9. 3.2 131 km NNW of San Antonio, Puerto Rico
  10. 3.1 129 km NNW of San Antonio, Puerto Rico
  11. 3.1 136 km NNW of San Antonio, Puerto Rico
  12. 3.0 126 km NNE of Punta Cana, Dominican Republic
  13. 3.1 82 km N of San Antonio, Puerto Rico
  14. 3.1 88 km N of Isabela, Puerto Rico
  15. 3.1 100 km N of Isabela, 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.