What technology did the U.S. Geological Survey (USGS) develop to help monitor volcanic activity at the five monitoring stations in the continental U.S., Alaska, Hawai'i, and the Mariana Islands?

National Seismology Center
Federal Emergency Management Agency (FEMA)
National Volcano Early Warning System (NVEWS)
Volcano Notification Service (VNS)

The technology developed by the U.S. Geological Survey (USGS) to help monitor volcanic activity at the five monitoring stations is the National Volcano Early Warning System (NVEWS).