GEOLOGY

Detailed explanation-1: -Public domain.) On March 16, 1980, the first sign of activity at Mount St. Helens occurred as a series of small earthquakes. On March 27, after hundreds of additional earthquakes, the volcano produced its first eruption in over 100 years.

Detailed explanation-2: -At 8:32 a.m. PDT on May 18, 1980, Mount St. Helens, a volcanic peak in southwestern Washington, suffers a massive eruption, killing 57 people and devastating some 210 square miles of wilderness. Called Louwala-Clough, or “the Smoking Mountain, ” by Native Americans, Mount St.

Detailed explanation-3: -David Alexander Johnston (December 18, 1949 – May 18, 1980) was an American United States Geological Survey (USGS) volcanologist who was killed by the 1980 eruption of Mount St. Helens in the U.S. state of Washington.

Detailed explanation-4: -Fifty-seven people were killed when Mount St. Helens erupted on May 18, 1980. It is the deadliest volcanic eruption in U.S. history. SKAMANIA COUNTY, Wash-Wednesday marks 42 years since Mount St.

Detailed explanation-5: -Before erupting, the volcano was 9, 677 feet. Over 230 square miles of forest was destroyed in minutes. The volcano has had numerous eruptions. The blast killed USGS scientist David Johnston. Native Americans abandoned hunting grounds at the volcano 3, 600 years ago. 18-May-2020