Earthquake.now

M5.1 Earthquake near George Town, Cayman Islands — 18 July 2026

A moderate earthquake of magnitude 5.1 was recorded near George Town, Cayman Islands on , with an epicentre 149 km south of George Town, at a focal depth of 10.0 km. It was the strongest of the 1 earthquakes recorded in the Cayman Islands in the preceding 30 days.

5.1 Moderate

Time (UTC): 2026-07-18 16:08:44

Time (your timezone): —

Magnitude: 5.1 (moderate)

Focal depth: 10.0 km (shallow)

Epicentre: 17.9439, -81.5431

Location: 149 km S of George Town, Cayman Islands

Country: Cayman Islands

USGS link to NOAA tsunami information: Not linked

Review status: Reviewed

Source: USGS event page

How strong was this earthquake?

Moderate earthquakes can damage poorly built or unreinforced structures near the epicentre, while well-engineered buildings typically escape serious harm. Shaking is often strong enough to wake sleeping residents over a wide area.

A magnitude 5.1 earthquake radiates roughly 674 tons of TNT equivalent in seismic energy.

The USGS assigns this earthquake a significance score of 401, 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 10:42 local solar time at the epicentre, during the morning.

This event was shallower than 100% of the 13 earthquakes recorded in the Cayman Islands in our catalogue and stronger than 85% of them.

Where was the epicentre?

The epicentre was located at 17.9439, -81.5431 — 149 km south of George Town. The closest other recorded event was a magnitude 4.3 earthquake 56 km west-southwest of here on 09 February 2025.

The nearest other settlements in our records are Bodden Town (114 km north-northeast), East End (153 km east-northeast) and Barra Patuca (193 km west-southwest).

Why the 10 km depth matters

At 10 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, an event this size can be felt widely and may cause minor local damage. 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 M5.1 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

No further earthquakes have been recorded within about 150 km of the epicentre in the seven days after this event.

19 earthquakes of magnitude 4 or above have been logged within roughly 200 km of this epicentre in our catalogue. The strongest was a magnitude 7.6 event near George Town on 08 February 2025. This M5.1 event released about 5,623 times less energy than that event.

No other earthquakes have been recorded within 100 km of this epicentre in the past year, which makes this a genuinely isolated event.

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

Where this event sits in the record

This earthquake is part of the July 2026 worldwide record, and of earthquakes in the Cayman Islands during July 2026. Browse the full monthly archive to compare periods.

Nearest recorded earthquakes to this epicentre

Other recent earthquakes in the Cayman Islands

All recorded earthquakes in the Cayman Islands →

Other magnitude 5 earthquakes worldwide

All magnitude 5 earthquakes →

Questions about this earthquake

How strong was the earthquake near George Town?

It measured magnitude 5.1 — a moderate earthquake. A magnitude 5.1 earthquake radiates roughly 674 tons of TNT equivalent in seismic energy.

How deep was the earthquake near George Town?

The focus was 10 km below the surface, which counts as shallow.

Was the George Town earthquake felt at the surface?

At magnitude 5.1 and a focal depth of 10 km, shaking would have been concentrated near the epicentre.

When did the earthquake near George Town happen?

18 July 2026 at 16:08 UTC.

Was there a tsunami?

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

Have there been aftershocks?

No further earthquakes have been recorded within about 150 km of the epicentre in the seven days after this event.

How often do earthquakes happen near George Town?

19 earthquakes of magnitude 4 or above have been logged within roughly 200 km of this epicentre in our catalogue. The strongest was a magnitude 7.6 event near George Town on 08 February 2025. This M5.1 event released about 5,623 times less energy than that event.