Earthquake.now

M1.9 Earthquake near Guayanilla, Puerto Rico — 23 March 2026

A micro earthquake of magnitude 1.9 was recorded near Guayanilla, Puerto Rico on , with an epicentre 2 km northwest of Guayanilla, at a focal depth of 17.1 km. It ranked as the 131st strongest of 143 earthquakes recorded in Puerto Rico in the preceding 30 days.

1.9 Micro

Time (UTC): 2026-03-23 02:50:20

Time (your timezone): —

Magnitude: 1.9 (micro)

Focal depth: 17.1 km (shallow)

Epicentre: 18.0328, -66.8090

Location: 2 km NW of Guayanilla, Puerto Rico

Country: Puerto Rico

USGS link to NOAA tsunami information: Not linked

Review status: Reviewed

Source: USGS event page

How strong was this earthquake?

Micro earthquakes are almost never felt at the surface and are recorded only by seismographs.

A magnitude 1.9 earthquake radiates roughly 11 kg of TNT equivalent in seismic energy.

The USGS assigns this earthquake a significance score of 56, which is below the USGS threshold of more than 600 for its significant-earthquake list. The ranking combines magnitude with available Did You Feel It responses and PAGER alert level; it is not a direct measurement of damage.

What the magnitude scale actually measures →

When it happened locally

That is about 22:23 local solar time at the epicentre, late at night.

This event was deeper than 66% of the 3,752 earthquakes recorded in Puerto Rico in our catalogue and stronger than 6% of them.

Where was the epicentre?

The epicentre was located at 18.0328, -66.8090 — 2 km northwest of Guayanilla. The closest other recorded event was a magnitude 2.1 earthquake 3 km east-southeast of here on 11 September 2026.

The nearest other settlements in our records are Adjuntas (14 km northeast), Boquerón (34 km west), Bajadero (39 km north-northeast) and Arecibo (47 km north).

Why the 17 km depth matters

At 17 km this was a shallow earthquake. Shallow events release their energy close to the surface, so for a given magnitude they produce noticeably stronger shaking — and more damage — than deeper ones. Roughly three quarters of all earthquakes worldwide occur at shallow depths.

This catalogue does not ingest eyewitness responses, so it cannot confirm where this earthquake was felt. Based on magnitude alone, events this small are usually detected by instruments rather than people. Its shallow focus makes stronger surface shaking more likely than for a deeper event of the same magnitude.

Read more on how focal depth changes what you feel →

What does the tsunami information flag mean?

The USGS record does not carry a link to NOAA tsunami information. That field is not an all-clear and does not state whether a tsunami occurred. In this case, a damaging tsunami would be less likely because at M1.9 it falls below the magnitude 6.5 threshold that generally applies before a submarine earthquake displaces enough water to generate a damaging tsunami; it occurred inland rather than beneath the sea floor. For an active coastal alert, use tsunami.gov or your local warning authority.

How earthquakes generate tsunamis, and what the alert levels mean →

Aftershocks and local seismic history

34 further earthquakes have been recorded within about 150 km of the epicentre in the seven days after this event, the largest of them magnitude 3.4.

100 earthquakes of magnitude 4 or above have been logged within roughly 200 km of this epicentre in our catalogue. The strongest was a magnitude 5.9 event near Punta Cana on 25 February 2025. This M1.9 event released about 966,051 times less energy than that event.

1625 earthquakes have been recorded within 100 km of this epicentre in the past year, 110 of them in the past 30 days.

How long aftershock sequences last, and how large they get →

Where this event sits in the record

This earthquake is part of the March 2026 worldwide record, and of earthquakes in Puerto Rico during March 2026. Browse the full monthly archive to compare periods.

Nearest recorded earthquakes to this epicentre

Other recent earthquakes in Puerto Rico

All recorded earthquakes in Puerto Rico →

Other magnitude 1 earthquakes worldwide

Questions about this earthquake

How strong was the earthquake near Guayanilla?

It measured magnitude 1.9 — a micro earthquake. A magnitude 1.9 earthquake radiates roughly 11 kg of TNT equivalent in seismic energy.

How deep was the earthquake near Guayanilla?

The focus was 17 km below the surface, which counts as shallow.

Was the Guayanilla earthquake felt at the surface?

At magnitude 1.9 and a focal depth of 17 km, shaking would have been concentrated near the epicentre.

When did the earthquake near Guayanilla happen?

23 March 2026 at 02:50 UTC.

Was there a tsunami?

No. The USGS record carries no tsunami-information link for this event.

Have there been aftershocks?

34 further earthquakes have been recorded within about 150 km of the epicentre in the seven days after this event, the largest of them magnitude 3.4.

How often do earthquakes happen near Guayanilla?

100 earthquakes of magnitude 4 or above have been logged within roughly 200 km of this epicentre in our catalogue. The strongest was a magnitude 5.9 event near Punta Cana on 25 February 2025. This M1.9 event released about 966,051 times less energy than that event.