2: Case Study-Mount St. Helens On May 18,1 erupted explosively. This eruption ca

Question

2: Case Study-Mount St. Helens On May 18,1 erupted explosively. This eruption caused the loss of lives and property and affected the environment both locally and globally (to a degree). The economic losses produced were significant: they totaled approximately $3 billion. Thankfully, though, many human lives were spared. Fatalities caused by Mount St. Helens totaled 60 people. One of these people was a young volcanologist named David Johnston. At the time of the eruption, Dr. Johnston was monitoring gas emissions-checking for fluctuations in the gases' geochemistry. Thanks to his and other geologists' work of monitoring Mt. St. Helen, a significant portion of the population was evacuated before the eruption. The casualties could have been much worse. In this exercise, you will further explore Mount St. Helens using online resources. Navigate to the following website and explore content related to the geology, history, hazards, and monitoring of Mount St. Helens. Then answer the following questions USGS Volcano Hazards Program- Mount St. Helens Video on Mount St. Helens 1. What type of volcano is Mount St. Helens? 2. What was the most recent eruption of Mount St. Helens prior to the May 18, 1980 eruption? Has there been any eruptive activity since 1980? Describe some examples of pre-eruptive activity at Mount St. Helens in early 1980 that led geologists to believe that an eruption was likely to occur. 3.

Explanation / Answer

1) Mount st.Helens is a composite volcano, also called as stratovolcano.

Stratovolcanos are made up of

2) The most recent eruption of Mount St.Helens prior to the May 18, 1980 eruption took place on On April 17, 1857.

There was eruptive activity after 1980. Mount St. Helens last erupted on July 10, 2008.

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