Disaster Caused By The Nisqually Earthquake Essay

1422 Words Oct 26th, 2014 null Page
On the morning of February 28, 2001 the Pacific Northwest was hit by a 45 second, 6.8 magnitude intraslab earthquake called the Nisqually or “The Ash Wednesday” earthquake. The Nisqually earthquake occurred when the Juan de Fuca plate subducted under the North American plate, this quickly released the built up strain. This was caused by mineral changes as the plate moved farther into the mantle. The Nisqually earthquake hit the southern end of Puget Sound causing damage to the ports of Seattle and Tacoma. Most of the property damage occurred near the epicenter. For example, in Seattle, the Alaskan Viaduct and its seawall were extremely damaged. In Olympia the Fourth Avenue Bridge was damaged. Following the earthquake liquefaction, sand boils, landslides, and soil slumping occurred. The earthquake also went through a wildlife refuge causing liquefaction in the soil and damage to the buildings within, however, besides that, there was very little harm to the wildlife. The Nisqually earthquake caused approximately $305 million of insured losses and a total of $2 billion worth of damage in the state of Washington. However, George W. Bush declared it a natural disaster area and was therefore able to receive federal recovery assistance the day after the quake.

No aftershocks were recorded by the University of Washington network in the first 6 hours following the magnitude 6.8 main shock. In a typical aftershock sequence, the highest rate of aftershock activity occurs during…

Related Documents