QuakeIndex

Earthquake · reviewed by a seismologist

M 3.8md

104 km NNW of San Antonio, Puerto Rico

· 10 km deep · released about 7.8 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Aguadilla Municipio 105 kmIsabela Municipio 109 kmQuebradillas Municipio 115 kmAguada Municipio 116 kmMoca Municipio 118 kmRincón Municipio 119 kmCamuy 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 3.8 (md)
Depth
10 km below the surface
Felt
no reports yet
Nearest
Aguadilla Municipio, 105 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1611 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 7.8 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.8 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 22,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 970× the energy of this one
  3. Magna, Utah 2020 M 5.7 680× the energy of this one
  4. This earthquake M 3.8 about 7.8 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 16× 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 19.3970, -67.3958. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Aguadilla Municipio, PR 105 km (65 mi) NNW of here earthquakes near Aguadilla Municipio
Isabela Municipio, PR 109 km (68 mi) NNW of here earthquakes near Isabela Municipio
Quebradillas Municipio, PR 115 km (71 mi) NNW of here earthquakes near Quebradillas Municipio
Aguada Municipio, PR 116 km (72 mi) N of here earthquakes near Aguada Municipio
Moca Municipio, PR 118 km (73 mi) NNW of here earthquakes near Moca Municipio
Rincón Municipio, PR 119 km (74 mi) N of here earthquakes near Rincón Municipio

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

Aftershocks so far

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

  1. 3.8 Mona Passage
  2. 5.0 63 km NNW of San Antonio, Puerto Rico
  3. 3.8 138 km NNW of San Antonio, Puerto Rico
  4. 3.4 112 km N of San Antonio, Puerto Rico
  5. 3.6 91 km N of San Antonio, Puerto Rico
  6. 3.0 62 km N of Isabela, Puerto Rico
  7. 3.0 71 km N of San Antonio, Puerto Rico
  8. 3.8 73 km N of San Antonio, Puerto Rico
  9. 3.8 Mona Passage
  10. 3.3 Mona Passage
  11. 3.4 97 km NW of San Antonio, Puerto Rico
  12. 3.4 70 km N of Isabela, Puerto Rico
  13. 3.8 92 km NNW of San Antonio, Puerto Rico
  14. 3.8 91 km NE of Punta Cana, Dominican Republic
  15. 3.7 94 km N of San Antonio, 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 6.0 on 2019-09-24 — it released about 1,900 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.