Mount St. Helens has been reminding researchers it is still an active volcano.
More than 130 small tremors have been documented in the Mount St. Helens region in Washington, according to the US Geological Survey. The quakes began in mid-March and have ramped up to nearly 40 localized earthquakes a week.
Thousands of small quakes preceded the massive eruption on May 18, 1980 that blew off nearly 1,000 feet of the mountain and spewed hot ash across the state, resulting in deaths, forest fires, and flooding.
But this time, the data collected offers more reassurance than worry, say the volcanologists.