Definition

Proper noun: * Mount St. Helens: A major active stratovolcano located in the Cascade Range within Skamania County, Washington, United States. It is most famous for its catastrophic and deadly eruption on May 18, 1980, which was the deadliest and most economically destructive volcanic event in U.S. history.

Usage

• Mount St. Helens is used as a singular proper noun to refer to the specific volcano. It is often discussed in the context of geology, volcanology, and recent U.S. history.
  • The 1980 eruption of Mount St. Helens dramatically changed the landscape.
  • Scientists continuously monitor Mount St. Helens for seismic activity.
  • We plan to visit the Mount St. Helens National Volcanic Monument.

Advanced Usage

• The volcano's name is frequently used metonymically to represent the 1980 eruption event itself or the ongoing study of volcanic activity.
  • The lessons learned from Mount St. Helens have improved global volcanic hazard preparedness.
  • Mount St. Helens provided a modern case study for the formation of volcanic craters.

Variants and Related Words

• MSH (abbreviation): A common scientific abbreviation used in geology and research papers.
  • The MSH eruption sequence was documented in detail.
• St. Helens: A shortened, informal form sometimes used in local context.
  • The ash from St. Helens reached several states.

Synonyms

• There are no true synonyms for this proper noun. It can be described contextually as:
  • The Washington volcano
  • The 1980 eruption volcano

Related Phrases

• Mount St. Helens eruption (of 1980): The specific historical event.
  • The Mount St. Helens eruption lowered the mountain's summit by over 1,300 feet.
• Spirit Lake: A nearby lake famously affected by the 1980 eruption.
• Cascade Volcanic Arc: The larger geological feature to which Mount St. Helens belongs.

Noun

1. an active volcano in the Cascade Range in southwestern Washington; erupted violently in 1980 after 123 years of inactivity