Sunday marks 45 years since Mount St. Helens erupted in Washington state. The deadly eruption happened shortly after 8:30 a.m. on May 18, 1980, following months of small explosions and earthquakes ...

1980 Mount St. Helens eruption considered ‘game changer’ for volcanic observation: The 1980 eruption of Mount St. Helens led to better seismic monitoring, increasing seismometers in the ...

But the technology to predict eruptions has vastly improved. In 1980, Mount St. Helens only had a single seismometer, Westby said. "Now we've got 20," she said. These newer devices are more ...

But the technology to predict eruptions has vastly improved. In 1980, Mount St. Helens only had a single seismometer, Westby said. "Now we've got 20," she said. These newer devices are more ...

In addition to the newly established monitoring system, the administration also uses a specialized instrument known as a nodal seismometer for daily monitoring. The device detects vibrations in the ...