OnThisDay 42 years ago, iconic MountStHelens erupted in southwestern Washington state in the deadliest and most economically destructive volcanic event in U.S. history. Imagery from NOAA's GOES-3 satellite captured the enormous blast. Learn more:
Forty years ago today, iconic Mount St. Helens erupted in southwestern Washington state in the deadliest and most economically destructive volcanic event in U.S. history.The mountain is one of several active volcanoes in the Cascades range, whose towering conical peak once reached upwards of 9,600 feet. It erupted on May 18, 1980, after lying dormant for more than 123 years.
Shortly after 8:30 a.m. PDT on May 18, a huge earthquake caused a mile-wide portion of the mountain’s north face to collapse. The eruption produced a force equal to 10–50 megatons of TNT, the equivalent ofreleased over the city of Hiroshima during World War II, and superheated gas and rock exploded out of the volcano sideways at speeds of up to 400 mph.
on a football field. In just three days, the airborne ash had spread across the US and encircled the entire planet in fifteen.Satellites Watched the Eruption from Above In fact, NOAA's third Geostationary Operational Environmental Satellite famously captured a plume of ash from the eruption in the images below using its instrument. The information it gathered about the ash cloud helped warn pilots, inform public health officials, and track recovery of the area over time.
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