QuakeIndex

Earthquake · reviewed by a seismologist

M 2.3md

Earthquake near Emajagua, PR

No earthquake was likely felt in Emajagua in the 24 hours to 5:26 pm AST (21:26 UTC). The last one was M 2.2, 7 km (5 mi) ESE, at 2:59 pm AST on 4 November 2026, estimated intensity II (weak) in town. Every earthquake near Emajagua

This page: a magnitude 2.3 earthquake was recorded 9 km (6 mi) south-southwest of Emajagua, PR, at 11:55 am AST on 11 August 2018 (15:55 UTC), 12 km deep.

USGS: 9 km SSW of Emajagua, Puerto Rico

56 km (35 mi) SSE of San Juan, PR · 38 km (23 mi) SSE of Caguas, PR

11:55 am AST, Aug 11, 2018 · · 12 km deep · released about 74 lb of TNT

Every earthquake near Emajagua Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Maunabo Municipio 9 kmPatillas Municipio 13 kmArroyo Municipio 16 kmYabucoa Municipio 16 kmGuayama Municipio 26 kmSan Lorenzo Municipio 26 kmHumacao Municipio 27 kmLas Piedras Municipio 30 kmCayey Municipio 33 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
11:55 am AST on 11 August 2018 ()
Where
9 km (6 mi) south-southwest of Emajagua, PR · earthquakes near Emajagua
Magnitude
M 2.3 (md)
Depth
12 km below the surface
Felt
no reports yet
Nearest
Maunabo Municipio, 9 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3014 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

At this magnitude and depth, people at rest would likely notice it out to about 15 km (9 mi) from the epicentre. In Emajagua, 9 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 9 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 74 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.3 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 200,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 140,000× the energy of this one
  3. Around the size people start to feel M 3.0 13× the energy of this one
  4. This earthquake M 2.3 about 74 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 3,200 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 · 45 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 17.9206, -65.9016. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Maunabo Municipio, PR 9 km (5 mi) N earthquakes near Maunabo Municipio
Patillas Municipio, PR 13 km (8 mi) NW earthquakes near Patillas Municipio
Arroyo Municipio, PR 16 km (10 mi) WNW earthquakes near Arroyo Municipio
Yabucoa Municipio, PR 16 km (10 mi) NNE earthquakes near Yabucoa Municipio
Guayama Municipio, PR 26 km (16 mi) WNW earthquakes near Guayama Municipio
San Lorenzo Municipio, PR 26 km (16 mi) NNW earthquakes near San Lorenzo 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. 2.0 7 km SE of Arroyo, Puerto Rico
  2. 2.1 4 km ESE of Palmarejo, Puerto Rico
  3. 2.1 1 km SSE of G. L. Garcia, Puerto Rico
  4. 2.5 11 km S of Emajagua, Puerto Rico
  5. 1.9 2 km S of Las Ochenta, Puerto Rico
  6. 2.4 5 km SSW of Central Aguirre, Puerto Rico
  7. 1.7 0 km WNW of Mariano Colón, Puerto Rico
  8. 2.2 3 km SSW of Pastos, Puerto Rico
  9. 1.7 3 km ENE of Pastos, Puerto Rico
  10. 2.1 3 km SSW of Salinas, Puerto Rico
  11. 1.7 2 km S of Jauca, Puerto Rico
  12. 2.2 2 km SE of Cidra, Puerto Rico
  13. 2.2 22 km SSE of Lamboglia, Puerto Rico
  14. 2.6 3 km NNW of Benitez, Puerto Rico
  15. 2.6 14 km SW of Esperanza, 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.