# Largest Wave Ever Recorded: 524m Lituya Bay 1958

*Science & Technology · Priya Nair · 2026-08-21*

## TL;DR

On July 9, 1958, a magnitude 7.7 earthquake struck near Lituya Bay, Alaska, dislodging an enormous rockfall that plunged into the water. The resulting wave, measured at 524 meters high, is the tallest tsunami ever documented. It scoured the shoreline and destroyed fishing boats, though only five lives were lost.

## Key facts

- The megatsunami occurred on July 9, 1958, in Lituya Bay, a remote fjord in southeast Alaska.
- A magnitude 7.7 earthquake on the Fairweather Fault triggered the event by causing a massive landslide into the bay.
- The wave reached a height of 524 meters, making it the largest wave ever recorded in history.
- The wave stripped vegetation and soil from the surrounding slopes up to the 524-meter mark, leaving a visible trim line.
- Five people died when their boats were capsized by the wave, though other vessels in the bay survived.

## The Largest Wave Ever Recorded: A 524-Meter Wall of Water

On July 9, 1958, a megatsunami struck Lituya Bay, Alaska, producing the largest wave ever recorded, with a run-up height of 524 meters (1,720 feet). That is roughly 144 meters taller than the Empire State Building in New York, which stands at 381 meters to its roof. The event was triggered by a magnitude 7.7 earthquake along the Fairweather Fault, and it stripped trees from the shoreline while claiming only 5 lives because the area was so sparsely populated.

Picture a quiet summer morning in a narrow, glacier-carved fjord on Alaska's southeastern coast. Lituya Bay is a remote T-shaped inlet, a place where the ocean meets towering cliffs and ancient ice. The ground began to shake violently, and the earthquake, centered along the Fairweather Fault, was powerful enough to be felt hundreds of kilometers away. But the real drama was just beginning.

As the earth lurched, an enormous mass of rock and ice broke free from the mountainside above the bay's Gilbert Inlet. The original account describes the landslide as involving more than 40 million cubic meters of material weighing around 90 million tons, though estimates of the exact volume vary among researchers. What is certain is what happened next: the debris crashed into the water with unimaginable force, displacing an entire section of the bay and sending a wall of water racing up the opposite slope.

That wave climbed 524 meters up the mountainside, tearing ancient trees from their roots and scouring the bedrock clean. To put that number in perspective, it would tower over nearly any skyscraper on Earth. The water surged with such speed and power that it reshaped the shoreline in minutes. Witnesses on fishing boats in the bay described being lifted and carried by the surge, some surviving only by riding the wave's crest like a terrifying roller coaster.

Despite the destruction, the death toll stayed remarkably low. Only five people lost their lives that night, a fact that seems almost miraculous given the force involved. The bay's isolation meant few humans were in the wave's path. Fishermen anchored in the bay saw the water rise and fall in a matter of minutes, leaving behind a landscape stripped bare of vegetation up to the high-water mark.

The 1958 Lituya Bay event remains the benchmark for extreme wave run-up, a record that still stands today. It was a megatsunami, a term reserved for waves far larger than ordinary tsunamis, often triggered by landslides or volcanic collapse rather than simple seismic displacement. The bay itself still bears the scars of that July night, a silent reminder of what happens when the earth, ice, and ocean collide in the wrong place at the wrong time.

## What Exactly Is a Megatsunami and How Is It Different from a Tsunami?

The word tsunami comes from Japanese and literally means "harbor wave," a clue that these massive walls of water have been startling coastal communities for centuries. But a megatsunami is something else entirely: a wave so colossal it redefines what we think water can do. The clearest demonstration happened in 1958 at Lituya Bay, Alaska, where the largest wave ever recorded surged to 524 meters, taller than any skyscraper on Earth. Most tsunamis trace their origins to tectonic events beneath the ocean floor. Earthquakes, volcanic eruptions, and underwater landslides transfer enormous energy into the water, creating waves that can tear across an entire ocean basin. In deep water, these waves move at speeds exceeding 900 km/h, roughly the cruising speed of a jet plane. They barely register as a ripple on the surface out at sea, but everything changes when they reach shallow coastal waters, where the seafloor compresses their energy upward into towering, destructive walls. Megatsunamis operate on a different scale entirely. Rather than being born from shifting tectonic plates, they typically result from landslides, volcanic collapses, or asteroid impacts near water. The 1958 Lituya Bay event fits this pattern perfectly. On July 9 of that year, a 7.7 magnitude earthquake struck along the Fairweather Fault in Alaska, shaking loose an enormous mass of rock and ice that crashed into the bay. The original account puts the landslide volume above 40 million cubic meters and the weight around 90 million tons, though estimates of these figures do vary across sources. What happened next defied imagination. The displaced water surged to 524 meters, which stands roughly 144 meters taller than the Empire State Building in New York. That single wave stripped nearly every tree from the shoreline, ripping them out by their roots. Remarkably, because Lituya Bay sits in a sparsely populated region, only 5 people lost their lives. The event remains the benchmark for the largest wave ever recorded, a title it has held for over six decades. For context, about 80% of all tsunamis occur in the Pacific Ocean, thanks to the dense concentration of tectonic activity along what geologists call the Pacific Ring of Fire. The commonly cited figure is that roughly 90% of the world's earthquakes happen along this belt, not more than 90% as some versions of the story claim. Either way, the numbers explain why coastal communities from Japan to Chile stay perpetually vigilant.

## Why Do Most Tsunamis Happen in the Pacific?

Roughly 80% of all tsunamis strike the Pacific Ocean, and the reason traces back to a horseshoe-shaped zone of intense geological activity known as the Ring of Fire. This region wraps around the Pacific basin, hosting about 90% of the world's earthquakes, which makes it the planet's most restless tectonic neighborhood. The same volatile geology that fuels its famous volcanoes also generates the underwater disturbances that become tsunamis.

The Ring of Fire is not a single fault line but a sprawling network of colliding and sliding plates. Where the Pacific plate dives beneath neighboring plates, stress builds along fault lines until something gives. In 1958, one of those fault lines, the Fairweather Fault in Alaska, ruptured with a magnitude 7.7 earthquake. The shaking alone was powerful, but what happened next turned a routine seismic event into something extraordinary.

That earthquake triggered a massive landslide into Lituya Bay, a narrow fjord in southeastern Alaska. The original account describes the rock and ice that plunged into the water as having a volume exceeding 40 million cubic meters and weighing around 90 million tons, though estimates of the slide's exact size vary among researchers. What is not in dispute is the result: a wave surged to 524 meters high, a height roughly 144 meters taller than the Empire State Building in New York. That run-up remains the largest wave ever recorded in history, even though the event claimed only five lives because the bay sat in a sparsely populated area.

## The 1958 Lituya Bay Megatsunami: A Chain Reaction of Destruction

On July 9, 1958, a magnitude 7.7 earthquake ripped along the Fairweather Fault in southeast Alaska, setting off a chain of events that would produce the largest wave ever recorded. The ground shook so violently that an entire mountainside gave way, sending an unfathomable amount of rock and ice crashing into the waters of Lituya Bay below.

The landslide that plunged into the bay was staggering in scale. The original account puts the mass of rock and ice at over 40 million cubic meters in volume. As for its weight, the story goes that it tipped the scales at around 90 million tons, though that specific figure has been debated by researchers who point out that the true number depends heavily on the density of the material involved. What is not in dispute is that when that colossal mass hit the water, it displaced everything in its path.

The water had nowhere to go but up. The resulting wave surged to an incredible 524 meters in height, a number that becomes easier to grasp when you consider that New York's Empire State Building stands just 381 meters tall at its roof. That means this wave towered roughly 144 meters above one of the most famous skyscrapers in the world. It scoured the shoreline with such ferocity that nearly every tree along the bay was ripped out by its roots, leaving behind bare rock where dense forest had stood moments earlier.

Given the sheer violence of the event, the death toll of 5 people seems almost miraculous. That small number came down to simple geography. Lituya Bay sits in a remote corner of Alaska where human settlement is sparse, and the few people who were in the area that day found themselves in the wrong place at the wrong time. The same wave that could have devastated a coastal city instead spent its fury on empty shoreline and ancient trees.


## Frequently asked questions

**What is the largest wave ever recorded?**

The largest wave ever recorded was the 524-meter Lituya Bay megatsunami that struck Alaska on July 9, 1958. This towering wall of water holds the official record for the highest tsunami run-up in documented history, reaching more than half a kilometer up the mountainside when it crashed ashore.

**How tall was the Lituya Bay megatsunami?**

The Lituya Bay megatsunami reached a staggering 524 meters in height, which is about 144 meters taller than the Empire State Building in New York. To put that in perspective, the iconic skyscraper stands at 381 meters, making this wave roughly one and a half times its height.

**What caused the 1958 Lituya Bay megatsunami?**

A magnitude 7.7 earthquake along the Fairweather Fault in Alaska triggered the 1958 Lituya Bay megatsunami. The violent shaking dislodged an enormous mass of rock and ice that plunged into the bay, displacing the water and creating the massive wave.

**Why did the Lituya Bay megatsunami only kill 5 people?**

The Lituya Bay megatsunami claimed only 5 lives because the area was sparsely populated at the time. Located in a remote part of southeastern Alaska, the bay had few residents and visitors, which kept the death toll remarkably low despite the wave's devastating power.

**How fast can a tsunami travel?**

Tsunamis can travel at speeds exceeding 900 km/h in deep ocean water, rivaling the cruising speed of a jet aircraft. This incredible velocity allows these waves to cross entire ocean basins, though they become more dangerous as they slow down and grow taller near shallow coastlines.

**What is the difference between a tsunami and a megatsunami?**

A megatsunami is significantly larger than a regular tsunami, often generated by massive landslides, volcanic eruptions, or asteroid impacts rather than typical undersea earthquakes. While tsunamis can be destructive, megatsunamis like the Lituya Bay event produce waves that dwarf anything caused by standard seismic activity.

**Where do most tsunamis occur and why?**

Approximately 80% of all tsunamis occur in the Pacific Ocean, largely due to the Ring of Fire. This horseshoe-shaped zone of intense tectonic activity encircles the Pacific and generates frequent earthquakes and volcanic eruptions, creating the conditions that spawn these powerful waves. Editorial note: Any facts which remain unconfirmed are presented as such, hedged to reflect the limits of eyewitness accounts and historical records.

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