A spike in earthquakes at Mount Adams, a volcano in Washington state, prompted scientists to install additional monitoring instruments to assess the seismic activity.

The volcano formed around 520,000 years ago. The largest cone grew during three eruptive episodes — 500,000, 400,000 and 50,000 to 30,000 years ago — and is surrounded by several smaller vents.

The recent earthquakes have been small — ranging from magnitudes of 0.9 to 2.0 — but the federal government has only one seismometer in the vicinity of Mount Adams, the second-tallest volcano ...

A normally quiet “high threat” volcano in Washington state has been shaking at a record rate — prompting an alert from geologists who ultimately said there’s little chance it will erupt soon.

There’s been some unusual rumblings coming from Mount Adams, but for those in the area, it’s not time to panic. Geologists are closely monitoring Washington’s largest volcano (and second ...

The second-tallest volcano in Washington had six recorded earthquakes, ranging from magnitude 0.9 to 2.0. Typically, earthquakes there happen once every 2-3 years.

Mount Adams is the largest active volcano in Washington state. (Image credit: Google Earth) It last erupted at some point between 3,800 and 7,600 years ago, according to USGS .

The second-tallest volcano in Washington had six recorded earthquakes, ranging from magnitude 0.9 to 2.0. Typically, earthquakes there happen once every 2-3 years.

The second-tallest volcano in Washington had six recorded earthquakes, ranging from magnitude 0.9 to 2.0. Typically, earthquakes there happen once every 2-3 years.