QuakeIndex

Earthquake · reviewed by a seismologist

M 2.6md

Earthquake near Loíza, PR

No earthquake was likely felt in Loíza in the 24 hours to 12:54 pm AST (16:54 UTC). The last one was M 4.1, 78 km (48 mi) SE, at 5:44 am AST on 28 October 2026, estimated intensity II (weak) in town; 5 felt reports to USGS. Every earthquake near Loíza

This page: a magnitude 2.6 earthquake was recorded 27 km (17 mi) north-northwest of Loíza, PR, at 11:35 am AST on 15 June 2017 (15:35 UTC), 67 km deep.

USGS: 27 km NNW of Loíza, Puerto Rico

32 km (20 mi) NNE of San Juan, PR · 29 km (18 mi) N of Carolina, PR

11:35 am AST, Jun 15, 2017 · · 67 km deep · released about 250 lb of TNT

Every earthquake near Loíza Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Loíza Municipio 25 kmCarolina Municipio 30 kmSan Juan Municipio 30 kmCataño Municipio 33 kmToa Baja Municipio 35 kmRío Grande Municipio 36 kmTrujillo Alto Municipio 37 kmCanóvanas Municipio 38 kmDorado 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
11:35 am AST on 15 June 2017 ()
Where
27 km (17 mi) north-northwest of Loíza, PR · earthquakes near Loíza
Magnitude
M 2.6 (md)
Depth
67 km below the surface
Felt
no reports yet
Nearest
Loíza Municipio, 25 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3436 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. In Loíza, 27 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: San Juan, Suárez, Vieques.

How big was it?

This earthquake released about 250 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 61,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 43,000× the energy of this one
  3. Around the size people start to feel M 3.0 3.8× the energy of this one
  4. This earthquake M 2.6 about 250 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

No earthquake of M4 or more has been recorded within 50 km since our catalogue begins in 2016.

Before 2016, the USGS record lists 2 earthquakes of M5 or more within 50 km:

  1. 5.1 3 km W of Aguas Buenas, Puerto Rico · 50 km SSW of this epicentre
  2. 5.0 3 km N of Brenas, Puerto Rico · 46 km WSW 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 18.6676, -65.9453. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Loíza Municipio, PR 25 km (15 mi) S earthquakes near Loíza Municipio
Carolina Municipio, PR 30 km (19 mi) S earthquakes near Carolina Municipio
San Juan Municipio, PR 30 km (19 mi) SSW earthquakes near San Juan Municipio
Cataño Municipio, PR 33 km (20 mi) SW earthquakes near Cataño Municipio
Toa Baja Municipio, PR 35 km (22 mi) SW earthquakes near Toa Baja Municipio
Río Grande Municipio, PR 36 km (22 mi) SSE earthquakes near Río Grande Municipio

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

Aftershocks so far

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

  1. 1.9 30 km NNE of Luquillo, Puerto Rico
  2. 4.8 53 km N of Brenas, Puerto Rico
  3. 2.8 23 km NNE of Playa Fortuna, Puerto Rico
  4. 2.5 18 km NNE of Playa Fortuna, Puerto Rico
  5. 2.6 22 km NNE of Playa Fortuna, Puerto Rico
  6. 2.4 24 km NNE of Luquillo, Puerto Rico
  7. 2.0 29 km NNE of Luquillo, Puerto Rico
  8. 2.7 30 km N of Loíza, Puerto Rico
  9. 2.4 34 km NE of Vieques, Puerto Rico
  10. 1.7 20 km NNE of Luquillo, Puerto Rico
  11. 3.4 67 km NNE of Suárez, Puerto Rico
  12. 2.5 25 km NNE of Luquillo, Puerto Rico
  13. 2.5 53 km NNE of Luquillo, Puerto Rico
  14. 2.6 1 km N of Pueblito del Rio, Puerto Rico
  15. 3.1 24 km NNW of Loíza, 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.