Created in 1961, this Commission is considered a quasi-judicial board. Its meetings are held as necessary on the first Monday of each month at 6:00 pm. The meetings are open to the public. The commission is composed of nine members who are required to be resident citizens and qualified voters of the city. Members are appointed by the mayor, subject to confirmation by a majority of city council. Powers and Duties. To perform the duties imposed upon the commission by state law;
Mount St. Helens is one of the Cascade Volcanoes that reach from Washington to California. Before and After the Eruption Earthquakes caused by magma forcing its way to the surface, called harmonic tremors, preceded the blast.
As with most other volcanoes in the Cascade Range, Mount St. Helens is a large eruptive cone consisting of lava rock interlayered with ash, pumice, and other deposits. The mountain includes layers of basalt and andesite through which several domes of dacite lava have erupted.his volcano is well known for its ash explosions and pyroclastic flows. Mount St. Helens is most notorious for its catastrophic eruption on May 18, 1980, at 8:32 a.m. PDT, the deadliest and most economically destructive volcanic event in the history of the United States.