QuakeIndex

Earthquake · reviewed by a seismologist

M 2.9md

Earthquake near Lamboglia, PR

Yes: an earthquake was likely felt in Lamboglia in the last 24 hours. M 2.9, 31 km (19 mi) ESE of Lamboglia, at 5:20 pm AST on 11 November 2026 (21:20 UTC); the estimated shaking in Lamboglia was intensity II (weak). 1 person has reported feeling it to USGS. Every earthquake near Lamboglia

This page: a magnitude 2.9 earthquake was recorded 22 km (14 mi) south of Lamboglia, PR, at 9:18 pm AST on 31 August 2017 (01:18 UTC), 2.0 km deep. 1 person has reported feeling it to USGS.

USGS: 21 km S of Lamboglia, Puerto Rico

70 km (43 mi) S of San Juan, PR · 50 km (31 mi) S of Caguas, PR

9:18 pm AST, Aug 31, 2017 · · 2.0 km deep · released about 630 lb of TNT

Every earthquake near Lamboglia Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Arroyo Municipio 23 kmPatillas Municipio 24 kmMaunabo Municipio 25 kmGuayama Municipio 29 kmYabucoa Municipio 32 kmSalinas Municipio 39 kmSan Lorenzo Municipio 40 kmCayey Municipio 41 kmHumacao Municipio 43 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
9:18 pm AST on 31 August 2017 ()
Where
22 km (14 mi) south of Lamboglia, PR · earthquakes near Lamboglia
Magnitude
M 2.9 (md)
Depth
2.0 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Arroyo Municipio, 23 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1557 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 31 km (19 mi) from the epicentre. In Lamboglia, 22 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.

Likely felt in: Emajagua 25 km, intensity II · Guayama 28 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 630 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 24,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 17,000× the energy of this one
  3. Around the size people start to feel M 3.0 1.5× the energy of this one
  4. This earthquake M 2.9 about 630 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 380 times the energy of this one.

Before 2016, the USGS record lists one earthquake of M5 or more within 50 km:

  1. 5.3 68 km SSE of Emajagua, Puerto Rico · 50 km SSE 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 17.7861, -65.9531. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Arroyo Municipio, PR 23 km (14 mi) NNW earthquakes near Arroyo Municipio
Patillas Municipio, PR 24 km (15 mi) N earthquakes near Patillas Municipio
Maunabo Municipio, PR 25 km (15 mi) NNE earthquakes near Maunabo Municipio
Guayama Municipio, PR 29 km (18 mi) NW earthquakes near Guayama Municipio
Yabucoa Municipio, PR 32 km (20 mi) NNE earthquakes near Yabucoa Municipio
Salinas Municipio, PR 39 km (24 mi) WNW earthquakes near Salinas Municipio

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

Aftershocks so far

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

  1. 2.8 6 km SE of G. L. Garcia, Puerto Rico
  2. 1.6 5 km SSE of Jobos, Puerto Rico
  3. 2.1 2 km NW of Bayamon, Puerto Rico
  4. 2.0 10 km S of Salinas, Puerto Rico
  5. 2.4 28 km SSW of Central Aguirre, Puerto Rico
  6. 3.3 1 km SE of Sumidero, Puerto Rico
  7. 2.7 13 km W of Esperanza, Puerto Rico
  8. 2.3 2 km ESE of Humacao, Puerto Rico
  9. 2.0 9 km SSW of Central Aguirre, Puerto Rico
  10. 2.2 9 km SSE of Jobos, Puerto Rico
  11. 2.4 14 km SSE of Central Aguirre, Puerto Rico
  12. 2.7 1 km NE of Jauca, Puerto Rico
  13. 2.7 1 km S of G. L. Garcia, Puerto Rico
  14. 2.9 4 km SW of Gurabo, Puerto Rico
  15. 2.7 10 km S of Jobos, 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.