Landscapes Obliterated

The first wave of the 2004 Indian Ocean tsunami hits Ao Nang, Thailand.

Tsunamis can create a trail of destruction that leaves permanent scars. They can destroy buildings, devastate the landscape, and ruin natural and agricultural lands.

In these images from the Japanese tsunami of 2011, you can see how the tsunami inundated fields, leveled buildings, and carried debris as far inland as the town of Otomo on the right.

Before

A satellite image of Rikuzentakata, Japan, before and after the March 2011 tsunami.

After

A satellite image of Rikuzentakata, Japan, before and after the March 2011 tsunami.

In this pair of images from the 1998 Papua New Guinea tsunami, you can see how the waves completely wiped away a church.

A church and village before and after the 1998 Papua New Guinea tsunami.

Here you can see the Scotch Cap lighthouse as it looked prior to April 1, 1946. The white reinforced-concrete tower rose nearly to 30 meters on a bluff 12 meters above the sea.

The Scotch Cap Lighthouse on Unimak Island, Alaska, before the earthquake. A magnitude 8.0 (Mw) earthquake with the source to the south of Unimak Island generated a tsunami that destroyed the five-story lighthouse, located 9.8 m above sea level. Only the foundation and part of the concrete sea wall remained. All five occupants were killed. The waves deposited debris as high as 35 m above the sea. Although little damage occurred in Alaska, except at Scotch Cap, the tsunami was one of the most destructive ever to occur in the Hawaiian Islands.
The Scotch Cap Lighthouse on Unimak Island, Alaska after the earthquake and tsunami. A magnitude 8.0 (Mw) earthquake with the source to the south of Unimak Island generated a tsunami that destroyed the five-story lighthouse, located 9.8 m above sea level. Only the foundation and part of the concrete sea wall remained. All five occupants were killed. The waves deposited debris as high as 35 m above the sea. Although little damage occurred in Alaska, except at Scotch Cap, the tsunami was one of the most destructive ever to occur in the Hawaiian Islands.

Early on the morning of April 1, a 30-meter wall of water struck the lighthouse, leaving little but the foundations and a field of rubble.

But tsunamis and their accompanying earthquakes can leave even longer lasting scars.

How thrust-fault tsunamis occur.

When thrust faults at subduction zones rupture, they can dramatically change the land.

How thrust-fault tsunamis occur.

The overriding plate can bend like a bow before the quake when the plates are stuck, but during an earthquake, the portion of the plate nearest the fault springs up while the land immediately behind it drops down.

How thrust-fault tsunamis occur.

This effect can be large, and can make coasts even more vulnerable to tsunamis when land sinks, as happened in the March 2011 earthquake and tsunami in Japan.

Plate uplift and downdrop around the epicenter of the Indian Ocean Tsunami

Plate uplift and downdrop around the epicenter of the Indian Ocean Tsunami

In this image from the Indian Ocean Tsunami, you can see how the plate rose near the boundary (thicker black line), shown in reds and yellows, and sank farther behind it, close to shore, shown in blues.