A swarm of more than 1,350 earthquakes shook Mount Rainier this summer. USGS scientists took a closer look. Here’s what they ...

More than 300 earthquakes have erupted at Washington's Mount Rainier this week, the largest earthquake swarm at the volcano since 2009. As of Thursday, July 10, 334 earthquakes had been identified ...

A snowcapped backdrop to Seattle and Puget Sound, Mount Rainier is a slumbering giant that last erupted in the 1890s.

Swarms can occur once or twice at year at Mount Rainier, though the number of quakes involved are usually smaller, the volcano observatory said.

Swarms can occur once or twice at year at Mount Rainier, though the number of quakes involved are usually smaller, the volcano observatory said.