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Whaleback structure (center) of dome withn Mount St. Helens' crater. Dome is crumbling to right and glacier is uplifted to the left, view from the north. January 30, 2005.

An International Tsunami Survey Team studying the effects of the December 26, 2004 tsunami on Indonesia“‘’’s island of Sumatra documented wave heights of 20 to 30 m (65 to 100 ft) at the island's northwest end and found evidence suggesting that wave heights may have ranged from 15 to 30 m (50 to 100 ft) along at least a 100-km (60 mi) stretch of the northwest coast.

Wisconsin Department of Natural Resources employees measure current velocity and dissolved oxygen as part of a Long Term Resource Monitoring Program (LTRMP) partnership with the Upper Midwest Environmental Sciences Center (UMESC), Upper Mississippi River System (UMRS) Pool 8

Aerial view, Mount St. Helens' crater and dome, as seen from the northwest.

Crumbled sides of Mount St. Helens' dome, as seen from the northwest. January 24, 2005.

Glacier deformation, east side of Mount St. Helens' dome, as seen from the northeast. Large crevasses within glacier covered with grey ash.

Lava domes within Mount St. Helens' crater, as seen from the northwest. The 1980-86 dome is in the crater on the left and the new 2004-05 dome is on the right.

In Leupueng, Indonesia, on the island of Sumatra, Dr. Guy Gelfenbaum measures the height of snapped-off tree trunks and sea level changes shortly after the December 26, 2004 earthquake and tsunami in the Indian Ocean.

As part of an international tsunami survey team, Andy Moore of Kent State University takes measurement of a snapped-off tree trunk in Leupueng, Aceh in 2005, shortly after the deadly tsunami struck the island of Sumatra.

Mount St. Helens' crater and dome, as seen from the northeast.

Whaleback structure (center) of dome withn Mount St. Helens' crater as seen from the northwest. January 24, 2005.

Aerial view, Mount St. Helens' crater and dome, as seen from the northeast.

Aerial view, Mount St. Helens' crater and dome, as seen from the northeast. The new dome is just visible in the steam in the back of the crater.

Vertical view, Mount St. Helens' crater and dome. North is to the bottom and south to the top.

A landscape scene in Senegal, photographed in 1983 by U.S. Geological Survey Scientist G. Gray Tappan as part of his work on West African land cover. Tappan photographed the scene again in 1994.

A landscape scene in Senegal, photographed in 1994 by U.S. Geological Survey Scientist G. Gray Tappan as part of his work on West African land cover. Tappan previously photographed the scene in 1983.

A severely damaged home, or a portion of one, sits atop debris in Banda Aceh on the island of Sumatra. Damage was caused by a massive, highly destructive tsunami, triggered by a magnitude 9.1 earthquake just offshore of Sumatra, on December 26, 2004.

Boat carried inland by tsunami that struck Sumatra on December 26, 2004.

Aerial view, Mount St. Helens' crater and dome, as seen from the north-northeast. Ash covering is from event of January 16, 2005.

Aerial view, Mount St. Helens' crater and dome, as seen from the north.