QuakeIndex

Earthquake · reviewed by a seismologist

M 2.6md

50 km WSW of Stella, Puerto Rico

Yes. A magnitude 2.6 earthquake was recorded 50 km WSW of Stella, Puerto Rico, at 12:31 am AST on 1 September 2019 (04:31 UTC), 94 km deep.

· 94 km deep · released about 260 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mayagüez Municipio 24 kmRincón Municipio 50 kmAguada Municipio 58 kmCabo Rojo Municipio 61 kmAñasco Municipio 62 kmHormigueros Municipio 64 kmAguadilla Municipio 66 kmMoca Municipio 69 kmSan Germán Municipio 72 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 2.6 (md)
Depth
94 km below the surface
Felt
no reports yet
Nearest
Mayagüez Municipio, 24 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2629 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 it was probably too small to be felt, even directly above it. 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 260 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.6 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 59,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 42,000× the energy of this one
  3. Around the size people start to feel M 3.0 3.7× the energy of this one
  4. This earthquake M 2.6 about 260 lb of TNT

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 2017-10-01 — about 470 times the energy of this one.

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

  1. 6.3 58 km E of Punta Cana, Dominican Republic · 35 km NNW of this epicentre
  2. 5.2 19 km SW of Stella, Puerto Rico · 36 km E of this epicentre
  3. 5.1 21 km SW of Stella, Puerto Rico · 36 km E 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 18.2228, -67.7121. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Mayagüez Municipio, PR 24 km (15 mi) SW earthquakes near Mayagüez Municipio
Rincón Municipio, PR 50 km (31 mi) ENE earthquakes near Rincón Municipio
Aguada Municipio, PR 58 km (36 mi) ENE earthquakes near Aguada Municipio
Cabo Rojo Municipio, PR 61 km (38 mi) ESE earthquakes near Cabo Rojo Municipio
Añasco Municipio, PR 62 km (38 mi) E earthquakes near Añasco Municipio
Hormigueros Municipio, PR 64 km (40 mi) E earthquakes near Hormigueros 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. 2.4 32 km WSW of Stella, Puerto Rico
  2. 2.7 44 km W of Pole Ojea, Puerto Rico
  3. 3.2 43 km SE of Punta Cana, Dominican Republic
  4. 2.8 Mona Passage
  5. 2.6 31 km W of Puerto Real, Puerto Rico
  6. 2.4 37 km W of Puerto Real, Puerto Rico
  7. 2.8 Mona Passage
  8. 2.9 55 km E of Punta Cana, Dominican Republic
  9. 2.1 20 km SW of Stella, Puerto Rico
  10. 2.9 Mona Passage
  11. 2.6 27 km W of Rincón, Puerto Rico
  12. 1.6 10 km NW of Puerto Real, Puerto Rico
  13. 2.8 41 km SE of Punta Cana, Dominican Republic
  14. 2.8 56 km SE of Punta Cana, Dominican Republic
  15. 2.3 33 km WSW of Stella, 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.