Monday, April 6

Redoubt


Wow - check out this photo by Chris Waythomas of Redoubt volcano in Alaska, which erupted March 31, 2009. View is to the west. Note ash covered slopes in foreground. Silver "glad we're not there." For sure. I recall that Stan and Silver arrived in Anchorage six months before the Great Alsakan earthquake on March 27, 1964, which went across south-central Alaska, ground fissures, collapsing buildings, and tsunamis directly caused about 131 deaths. It lasted nearly five minutes, it was the most powerful recorded earthquake in U.S. and Northern American history, and the third most powerful ever measured by seismograph; it had a moment magnitude of 9.2 and registered 8.4 on the Richter scale.

The quake produced earthquake liquefaction in the region. Ground fissures and failures caused major structural damage in several communities, much damage to property and several landslides. Anchorage sustained great destruction or damage to many inadequately engineered houses, buildings, and infrastructure (paved streets, sidewalks, water and sewer mains, electrical systems, and other man-made equipment). Two hundred miles southwest, some areas near Kodiak were permanently raised by 30 feet (9.1 m). East of Anchorage, areas around the head of Turnagain Arm near Portage dropped 8 feet (2.4 m), requiring reconstruction and fill to raise the Seward Highway above the new high tidemark. In Prince William Sound, a 27-foot (8.2 m) tsunami destroyed the village of Chenega, killing 23 of the 68 people who then lived there; survivors out-ran the wave, climbing to high ground. Post-quake tsunamis severely affected Valdez, Whittier, Seward, Kodiak, and other Alaskan Communities, as well as people and property in British Columbia, Oregon, and California. Tsunamis also caused damage in Hawaii and Japan. Silver describes the ground "melting underneath".

Dude!