QuakeIndex

Earthquake · reviewed by a seismologist

M 2.6md

Earthquake near Lamboglia, PR

No earthquake was likely felt in Lamboglia in the 24 hours to 8:30 am AST (12:30 UTC). The last one was M 3.3, 47 km (29 mi) WSW, at 8:40 am AST on 1 November 2026, estimated intensity II (weak) in town. Every earthquake near Lamboglia

This page: a magnitude 2.6 earthquake was recorded 7 km (4 mi) south-southwest of Lamboglia, PR, at 11:42 pm AST on 21 March 2023 (03:42 UTC), 12 km deep. 1 person has reported feeling it to USGS.

USGS: 6 km SSW of Lamboglia, Puerto Rico

54 km (33 mi) S of San Juan, PR · 34 km (21 mi) S of Caguas, PR

11:42 pm AST, Mar 21, 2023 · · 12 km deep · released about 220 lb of TNT

Every earthquake near Lamboglia Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Arroyo Municipio 6 kmPatillas Municipio 9 kmGuayama Municipio 14 kmMaunabo Municipio 15 kmYabucoa Municipio 22 kmCayey Municipio 25 kmSan Lorenzo Municipio 25 kmSalinas Municipio 27 kmCidra Municipio 32 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
11:42 pm AST on 21 March 2023 ()
Where
7 km (4 mi) south-southwest of Lamboglia, PR · earthquakes near Lamboglia
Magnitude
M 2.6 (md)
Depth
12 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Arroyo Municipio, 6 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1330 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 20 km (12 mi) from the epicentre. In Lamboglia, 7 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: Guayama 13 km, intensity II · Emajagua 16 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 220 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 68,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 48,000× the energy of this one
  3. Around the size people start to feel M 3.0 4.3× the energy of this one
  4. This earthquake M 2.6 about 220 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 lists one earthquake of M5 or more within 50 km:

  1. 5.1 3 km W of Aguas Buenas, Puerto Rico · 39 km NNW 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 17.9253, -66.0108. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Arroyo Municipio, PR 6 km (4 mi) NNW earthquakes near Arroyo Municipio
Patillas Municipio, PR 9 km (5 mi) NNE earthquakes near Patillas Municipio
Guayama Municipio, PR 14 km (9 mi) WNW earthquakes near Guayama Municipio
Maunabo Municipio, PR 15 km (9 mi) NE earthquakes near Maunabo Municipio
Yabucoa Municipio, PR 22 km (14 mi) NE earthquakes near Yabucoa Municipio
Cayey Municipio, PR 25 km (15 mi) NW earthquakes near Cayey Municipio

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

Aftershocks so far

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

  1. 2.9 8 km NNW of Coamo, Puerto Rico
  2. 3.0 1 km E of Jagual, Puerto Rico
  3. 2.4 8 km S of Orocovis, Puerto Rico
  4. 2.9 Puerto Rico region
  5. 3.3 8 km S of Orocovis, Puerto Rico
  6. 2.4 23 km SSE of Arroyo, Puerto Rico
  7. 2.7 2 km E of Santa Clara, Puerto Rico
  8. 3.0 1 km ENE of Bayamon, Puerto Rico
  9. 2.2 12 km SSE of Arroyo, Puerto Rico
  10. 2.8 24 km ESE of El Negro, Puerto Rico
  11. 3.2 1 km NE of Bajandas, Puerto Rico
  12. 3.1 4 km WNW of Santa Clara, Puerto Rico
  13. 2.0 1 km NE of La Plena, Puerto Rico
  14. 3.0 3 km NE of La Plena, Puerto Rico
  15. 3.1 2 km SW of Santa Clara, 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.