Even though earthquake swarms can be dangerous, scientists are able to model such events to analyze their structure. During the earthquake swarm in 2007, a group of scientists investigated the possibility that a volcanic eruption would occur. Five additional seismographs were placed in the earthquake zone, and scientists closely monitored the seismic activity. After additional data were gathered, scientists with the United States Geological Survey, the University of Washington, and other organizations, agreed that the Nazko earthquakes probably originated from movement of magma beneath the surface near Nazko Cone. However, because of the number and small size of the Nazko earthquakes, no volcanic eruption is likely. Other recent earthquakes in North America that have been attributed to magma but did not result in a volcanic eruption include the 2003 earthquakes under Lake Tahoe in the U.S. state of California and a 2004 earthquake swarm at Jordan Craters in the U.S. state of Oregon.