In the last month has significantly increased seismic activity of dangerous volcanoes in the United States. According to the US Geological Survey, many volcanoes country shaken by earthquakes, including multiple series of aftershocks.
As you know, a series of earthquakes occur in areas constantly supervolcano California Long Valley and Yellowstone. This Long Valley for several years, retains high seismic activity. Over the past three weeks in the area of its caldera occurred more than 200 earthquakes.
In the United States in recent years showing the seismic activity and other giants.
According to the Seismological Service of the Pacific Northwest, for the past two months in the area of hazardous Mount St. Helens in Washington state has considerably increased seismic activity. During this period, seismic recorded more than 130 aftershocks, and it may portend future eruption. Recall, November 18, 1980 there was a strong eruption of Mount St. Helens.
From the beginning, instead of rare earth tremors US Geological Survey registers have a series of earthquakes in the region of one of the most dangerous volcanoes Rainier, located in the same place, in the state of Washington. Two of the most long-lasting series recorded in February this year.
In Alaska, preparing for volcanic eruption Pavlova. 13 May the Alaska Volcano Observatory said the volcano began to constant tremors that indicate the movement of magma inside the tank.
Fixed and seismic activity in the area and many volcanoes in California. Since May 11th, recorded earthquake in the volcano Zinc Hill (magnitude 3.5), the volcano Tabus Creek (2.9), Cerro Prieto (2.9), the volcanic complex of Salton Sea (3.2) , volcano Clieu lake (3.8), Medical lake volcanic complex (tremors of magnitude 2.8, 2.6 and 4).
It is active and Mount Hood in Oregon. The US Geological Survey only two days from the 15th to 16th of May has recorded more than 70 aftershocks. The series of events in the vicinity of the volcano continues.
Geologists have expressed concern because of this situation. All these developments indicate an increased threat of eruption in the United States.