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M1.8 Earthquake near Womens Bay, United States — 28 August 2026

A micro earthquake of magnitude 1.8 was recorded near Womens Bay, United States on , with an epicentre 14 km south-southeast of Womens Bay, at a focal depth of 29.1 km. It ranked as the 2013th strongest of 7794 earthquakes recorded in the United States in the preceding 30 days.

1.8 Micro

Time (UTC): 2026-08-28 04:38:52

Time (your timezone): —

Magnitude: 1.8 (micro)

Focal depth: 29.1 km (shallow)

Epicentre: 57.5580, -152.5910

Location: 14 km SSE of Womens Bay, Alaska

Country: United States

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 1.8 earthquake radiates roughly 7.6 kg of TNT equivalent in seismic energy.

The USGS assigns this earthquake a significance score of 50, 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 →

Where was the epicentre?

The epicentre was located at 57.5580, -152.5910 — 14 km south-southeast of Womens Bay. The closest other recorded event was a magnitude 3.1 earthquake 32 km north of here on 12 August 2026.

Why the 29 km depth matters

At 29 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 M1.8 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 2 days since this event.

25 earthquakes of magnitude 4 or above have been logged within roughly 200 km of this epicentre in our catalogue. The strongest was a magnitude 5.6 event near Akhiok on 22 December 2024. This M1.8 event released about 501,187 times less energy than that event.

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

Where this event sits in the record

This earthquake is part of the August 2026 worldwide record, and of earthquakes in the United States during August 2026. Browse the full monthly archive to compare periods.

Nearest recorded earthquakes to this epicentre

Other recent earthquakes in the United States

All recorded earthquakes in the United States →

Other magnitude 1 earthquakes worldwide

Questions about this earthquake

How strong is a magnitude 1.8 earthquake?

Micro earthquakes are almost never felt at the surface and are recorded only by seismographs. A magnitude 1.8 earthquake radiates roughly 7.6 kg of TNT equivalent in seismic energy.

How deep was the earthquake near Womens Bay?

At 29 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.

Was the M1.8 earthquake near Womens Bay felt?

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.

What does the USGS tsunami field mean for this event?

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 M1.8 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.

Have there been aftershocks?

No further earthquakes have been recorded within about 150 km of the epicentre in the 2 days since this event.

How often do earthquakes happen near Womens Bay?

25 earthquakes of magnitude 4 or above have been logged within roughly 200 km of this epicentre in our catalogue. The strongest was a magnitude 5.6 event near Akhiok on 22 December 2024. This M1.8 event released about 501,187 times less energy than that event.