Earthquake · reviewed by a seismologist
M 2.3md
Earthquake near Humacao, PR
No earthquake was likely felt in Humacao in the 24 hours to 8:31 pm AST (00:31 UTC). The last one was M 4.1, 56 km (35 mi) ESE, at 5:44 am AST on 28 October 2026, estimated intensity II (weak) in town; 5 felt reports to USGS. Every earthquake near Humacao
This page: a magnitude 2.3 earthquake was recorded 2 km (1 mi) east-southeast of Humacao, PR, at 6:54 am AST on 13 March 2018 (10:54 UTC), 9.0 km deep.
USGS: 2 km ESE of Humacao, Puerto Rico
40 km (25 mi) SE of San Juan, PR · 27 km (16 mi) ESE of Caguas, PR
- When
- 6:54 am AST on 13 March 2018 ()
- Where
- 2 km (1 mi) east-southeast of Humacao, PR · earthquakes near Humacao
- Magnitude
- M 2.3 (md)
- Depth
- 9.0 km below the surface
- Felt
- no reports yet
- Nearest
- Humacao Municipio, 2 km ESE
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 3165 days ago
Earthquake alerts for Humacao, PR
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Alerts are on for .
Not a warning. An alert comes after USGS publishes a quake, usually minutes after the shaking. For early warning use ShakeAlert, through your phone's Wireless Emergency Alerts or the MyShake app.
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 18 km (11 mi) from the epicentre. In Humacao, 2 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: Humacao 2 km, intensity II · Emajagua 18 km, intensity II. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 91 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.
- Mineral, Virginia 2011 M 5.8 170,000× the energy of this one
- Magna, Utah 2020 M 5.7 120,000× the energy of this one
- Around the size people start to feel M 3.0 10× the energy of this one
- This earthquake M 2.3 about 91 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 2,600 times the energy of this one.
Before 2016, the USGS record lists one earthquake of M5 or more within 50 km:
- 5.1 3 km W of Aguas Buenas, Puerto Rico · 37 km WNW 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 18.1421, -65.8065. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Humacao Municipio, PR | 2 km (1 mi) | ESE | earthquakes near Humacao Municipio |
| Las Piedras Municipio, PR | 8 km (5 mi) | NW | earthquakes near Las Piedras Municipio |
| Naguabo Municipio, PR | 11 km (7 mi) | NE | earthquakes near Naguabo Municipio |
| Yabucoa Municipio, PR | 11 km (7 mi) | SSW | earthquakes near Yabucoa Municipio |
| Juncos Municipio, PR | 14 km (9 mi) | NW | earthquakes near Juncos Municipio |
| San Lorenzo Municipio, PR | 18 km (11 mi) | W | 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.
- 3.1 1 km SSW of Santa Barbara, Puerto Rico
- 2.2 7 km SE of Arroyo, Puerto Rico
- 2.1 7 km SE of Arroyo, Puerto Rico
- 1.8 5 km S of Palmas, Puerto Rico
- 2.9 3 km N of Palomas, Puerto Rico
- 2.7 6 km SE of Arroyo, Puerto Rico
- 1.8 6 km SSW of Lamboglia, Puerto Rico
- 2.4 5 km SE of Arroyo, Puerto Rico
- 1.7 5 km SSW of Lamboglia, Puerto Rico
- 2.2 2 km E of Arroyo, Puerto Rico
- 2.2 5 km SSW of Lamboglia, Puerto Rico
- 2.1 4 km ESE of Arroyo, Puerto Rico
- 1.8 2 km S of Palmas, Puerto Rico
- 1.6 4 km SSE of Palmas, Puerto Rico
- 2.0 4 km S of Palmas, 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
- The official USGS event page — the source of record for every value above
- Did you feel it? Report it to USGS — reports go to USGS, not to us
- ShakeMap for this event, when USGS has produced one
QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.