The Mount St. Helens is classified as an active stratovolcano with an elevation of 8,365 ft (2,550 m) and a prominence of 4,605 ft (1,404 m) above seal level. The mountain is located at Skamania County in Washington. The volcanic mountain is located within the Cascade ranges and forms part of cascade volcanic ash. The formation of Mount St. Helens follows volcanic eruptions that flowed over a long period. The Cascade Mountains occurred due to the movements of the Juan de Fuca plate and the North American plate. This forced lava to be ejected upwards to create volcanoes, hence forming the Mount St. Adams. Other mountains that can be found in this area include the Mount Adams (Harris, 1988).

According to the daily earthquake list observed on Wed Nov 21 10:41:59 UTC 2012, as the update time, globally there were three earthquakes with over 6.0 magnitude. These include the earthquake recorded at Tonga Region with magnitude of 6.1m. The other earthquake occurs at the Kuril Island with magnitude of 6.4, and the other occurred in Coquimbo, Chile with magnitude of 6.1. Only one the earthquake that occurred at Guerrero, At the same time, there were some other earthquakes with magnitude between 4.5 and 6.0 are 73 in number.

The most recent earthquake with over 4.5 magnitudes was in Sumbawa region in Indonesia with magnitude of 4.7. The depth in Kilometer was 129. However, the most recent earthquake that occurred near me was at Kenai Peninsula in Alaska. It had a magnitude of 2.6 with a depth of 76.6.

Alaska had experienced many of the earthquakes globally. Most of the earthquakes that occur in Alaska are mostly happening around Kenai Peninsula, and other areas such as the Alaska Peninsula and the Kenai Peninsula. In general, these areas are refereed as the Alaska-Aleutian megathrust (Foster and Karlstrom, 1967). The vast majority of the earthquakes on the Kenai peninsula occurs around the subduction zones as a result of the of the tectonic movements between the oceanic northwestward moving pacific plate that collides with the descending beneath the continental North-American plate (Combellick, 1997). Other causes of the earthquakes at the Kenai Peninsula are due to the movement of active faults (Vaughn and Hyherd). These are referred to as the intraplate earthquakes which occur at a great distance from the plate boundaries.

arrow_upward