QuakeIndex

Earthquake · reviewed by a seismologist

M 2.6md

Earthquake near Jobos, PR

No earthquake was likely felt in Jobos in the 24 hours to 11:28 am AST (15:28 UTC). The last one was M 3.0, 28 km (18 mi) WSW, at 7:09 pm AST on 5 November 2026, estimated intensity II (weak) in town. Every earthquake near Jobos

This page: a magnitude 2.6 earthquake was recorded 19 km (12 mi) south of Jobos, PR, at 9:27 pm AST on 4 September 2023 (01:27 UTC), 7.6 km deep.

USGS: 18 km S of Jobos, Puerto Rico

70 km (43 mi) S of San Juan, PR · 52 km (32 mi) SSW of Caguas, PR

9:27 pm AST, Sep 4, 2023 · · 7.6 km deep · released about 210 lb of TNT

Every earthquake near Jobos Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Guayama Municipio 21 kmSalinas Municipio 22 kmArroyo Municipio 25 kmSanta Isabel Municipio 28 kmPatillas Municipio 32 kmCayey Municipio 35 kmMaunabo Municipio 39 kmAibonito Municipio 39 kmCoamo Municipio 40 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
9:27 pm AST on 4 September 2023 ()
Where
19 km (12 mi) south of Jobos, PR · earthquakes near Jobos
Magnitude
M 2.6 (md)
Depth
7.6 km below the surface
Felt
no reports yet
Nearest
Guayama Municipio, 21 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1164 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 22 km (14 mi) from the epicentre. In Jobos, 19 km away, the estimate is intensity II (weak). 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.

Earthquakes near other towns within 30 km: Central Aguirre, Coquí, Guayama, Arroyo, Salinas, Corazón.

How big was it?

This earthquake released about 210 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 72,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 51,000× the energy of this one
  3. Around the size people start to feel M 3.0 4.6× the energy of this one
  4. This earthquake M 2.6 about 210 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 4.6 on 2016-12-05 — about 1,100 times the energy of this one.

Before 2016, the USGS record since 1900 lists no earthquake of M5 or more within 50 km.

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 17.7863, -66.1832. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Guayama Municipio, PR 21 km (13 mi) NNE earthquakes near Guayama Municipio
Salinas Municipio, PR 22 km (14 mi) NNW earthquakes near Salinas Municipio
Arroyo Municipio, PR 25 km (16 mi) NE earthquakes near Arroyo Municipio
Santa Isabel Municipio, PR 28 km (18 mi) NW earthquakes near Santa Isabel Municipio
Patillas Municipio, PR 32 km (20 mi) NE earthquakes near Patillas Municipio
Cayey Municipio, PR 35 km (22 mi) N earthquakes near Cayey Municipio

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

Aftershocks so far

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

  1. 2.5 10 km S of Emajagua, Puerto Rico
  2. 2.1 4 km SSE of Salinas, Puerto Rico
  3. 2.5 5 km SW of Central Aguirre, Puerto Rico
  4. 2.3 6 km SSE of Salinas, Puerto Rico
  5. 2.0 Puerto Rico region
  6. 2.7 Puerto Rico region
  7. 2.1 Puerto Rico region
  8. 3.3 4 km SSE of Salinas, Puerto Rico
  9. 3.2 Puerto Rico region
  10. 3.4 8 km S of Orocovis, Puerto Rico
  11. 2.0 4 km SE of Salinas, Puerto Rico
  12. 2.1 Puerto Rico region
  13. 3.2 4 km SSE of Salinas, Puerto Rico
  14. 2.4 4 km SSE of Salinas, Puerto Rico
  15. 2.6 Puerto Rico region

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.