QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

Earthquake near Emajagua, PR

Yes: an earthquake was likely felt in Emajagua in the last 24 hours. M 2.9, 23 km (14 mi) SE of Emajagua, at 5:20 pm AST on 11 November 2026 (21:20 UTC); the estimated shaking in Emajagua was intensity II (weak). 1 person has reported feeling it to USGS. Every earthquake near Emajagua

This page: a magnitude 2.1 earthquake was recorded 24 km (15 mi) south of Emajagua, PR, at 10:25 am AST on 27 January 2019 (14:25 UTC), 17 km deep.

USGS: 23 km S of Emajagua, Puerto Rico

72 km (45 mi) SSE of San Juan, PR · 53 km (33 mi) SSE of Caguas, PR

10:25 am AST, Jan 27, 2019 · · 17 km deep · released about 49 lb of TNT

Every earthquake near Emajagua Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Maunabo Municipio 24 kmPatillas Municipio 27 kmArroyo Municipio 28 kmYabucoa Municipio 30 kmGuayama Municipio 36 kmHumacao Municipio 39 kmSan Lorenzo Municipio 42 kmLas Piedras Municipio 44 kmCayey Municipio 47 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
10:25 am AST on 27 January 2019 ()
Where
24 km (15 mi) south of Emajagua, PR · earthquakes near Emajagua
Magnitude
M 2.1 (md)
Depth
17 km below the surface
Felt
no reports yet
Nearest
Maunabo Municipio, 24 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2846 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 5 km (3 mi) from the epicentre. In Emajagua, 24 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: Maunabo, Lamboglia, Palo Seco, El Negro, Palmas, Playita.

How big was it?

This earthquake released about 49 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 310,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 220,000× the energy of this one
  3. Around the size people start to feel M 3.0 19× the energy of this one
  4. This earthquake M 2.1 about 49 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 4,900 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 · 46 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 17.7893, -65.8563. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Maunabo Municipio, PR 24 km (15 mi) N earthquakes near Maunabo Municipio
Patillas Municipio, PR 27 km (17 mi) NNW earthquakes near Patillas Municipio
Arroyo Municipio, PR 28 km (18 mi) NW earthquakes near Arroyo Municipio
Yabucoa Municipio, PR 30 km (19 mi) N earthquakes near Yabucoa Municipio
Guayama Municipio, PR 36 km (22 mi) NW earthquakes near Guayama Municipio
Humacao Municipio, PR 39 km (24 mi) N earthquakes near Humacao Municipio

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

Aftershocks so far

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

  1. 1.6 3 km E of La Plena, Puerto Rico
  2. 2.3 0 km SW of Jobos, Puerto Rico
  3. 2.2 4 km SSW of Las Piedras, Puerto Rico
  4. 1.6 11 km SSE of Central Aguirre, Puerto Rico
  5. 1.6 Puerto Rico region
  6. 1.6 1 km NNE of Jobos, Puerto Rico
  7. 1.6 0 km ESE of Jobos, Puerto Rico
  8. 2.0 0 km WSW of Jobos, Puerto Rico
  9. 2.2 0 km NNE of Jobos, Puerto Rico
  10. 2.5 0 km NNW of Jobos, Puerto Rico
  11. 1.7 1 km NE of Jobos, Puerto Rico
  12. 2.6 0 km W of Jobos, Puerto Rico
  13. 2.1 0 km NNW of Jobos, Puerto Rico
  14. 2.2 0 km NNE of Jobos, Puerto Rico
  15. 1.7 0 km NE 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.