In the monthly seismicity reports for Yellowstone, it is common to read the statement, “earthquake activity in Yellowstone remains at background levels.” In fact, in the United States Geological Survey monthly activity reports, there is an alert level assigned to each volcano, Yellowstone included. The “normal” alert level is associated with a “non-erupting volcano that […] The post What is ‘normal’ earthquake activity in Yellowstone National Park? appeared first on Idaho Capital Sun.