Earthquake.now

M5.5 Earthquake near Bonin Islands, Japan region — 13 May 2025

A moderate earthquake of magnitude 5.5 was recorded near Bonin Islands, Japan region on , at a focal depth of 454.0 km.

5.5 Moderate

Time (UTC): 2025-05-13 16:52:35

Time (your timezone): —

Magnitude: 5.5 (moderate)

Focal depth: 454.0 km (deep)

Epicentre: 27.3434, 140.0720

Location: Bonin Islands, Japan region

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 5.5 earthquake radiates roughly 2,682 tons of TNT equivalent in seismic energy.

The USGS assigns this earthquake a significance score of 465, 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 27.3434, 140.0720. The closest other recorded event was a magnitude 4.3 earthquake 16 km north-northeast of here on 30 June 2026.

Why the 454 km depth matters

At 454 km this was a deep-focus earthquake, occurring well inside the subducting slab rather than in the crust. Deep events are rarely damaging even at large magnitudes, though they can be felt over very long distances.

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 deep focus normally weakens surface shaking while spreading perceptible motion over a broad area.

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 M5.5 it falls below the magnitude 6.5 threshold that generally applies before a submarine earthquake displaces enough water to generate a damaging tsunami; its 454 km focal depth is too great to deform the sea floor significantly. 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

1 further earthquakes have been recorded within about 150 km of the epicentre in the seven days after this event, the largest of them magnitude 4.3.

40 earthquakes of magnitude 4 or above have been logged within roughly 200 km of this epicentre in our catalogue. The strongest was a magnitude 5.0 event near Bonin Islands on 25 January 2026. This M5.5 event released about 5.6 times more 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 May 2025 worldwide record. Browse the full monthly archive to compare periods.

Nearest recorded earthquakes to this epicentre

Other magnitude 5 earthquakes worldwide

All magnitude 5 earthquakes →

Questions about this earthquake

How strong is a magnitude 5.5 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 5.5 earthquake radiates roughly 2,682 tons of TNT equivalent in seismic energy.

How deep was the earthquake near Bonin Islands?

At 454 km this was a deep-focus earthquake, occurring well inside the subducting slab rather than in the crust. Deep events are rarely damaging even at large magnitudes, though they can be felt over very long distances.

Was the M5.5 earthquake near Bonin Islands felt?

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 deep focus normally weakens surface shaking while spreading perceptible motion over a broad area.

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 M5.5 it falls below the magnitude 6.5 threshold that generally applies before a submarine earthquake displaces enough water to generate a damaging tsunami; its 454 km focal depth is too great to deform the sea floor significantly. For an active coastal alert, use tsunami.gov or your local warning authority.

Have there been aftershocks?

1 further earthquakes have been recorded within about 150 km of the epicentre in the seven days after this event, the largest of them magnitude 4.3.

How often do earthquakes happen near Bonin Islands?

40 earthquakes of magnitude 4 or above have been logged within roughly 200 km of this epicentre in our catalogue. The strongest was a magnitude 5.0 event near Bonin Islands on 25 January 2026. This M5.5 event released about 5.6 times more energy than that event.