Long Valley Caldera, USA

Long Valley Caldera is situated in Eastern California. It has taken an area of 32 kilometres long and 18 kilometres width. For the last two million years, the activity of the super volcano has drastically decreased. The last eruption was 76 000 years ago. However, for last years the earthquake activity of this region has increased. At this period a lot of cities of the state has experienced the series of earthquakes. In 2015 the intense earthquakes happened near Los Angeles and not far from San Francisco.

Many researchers claim that nuclear tests in Nevada state have increased the seismic activity of the region. In the second part of the 20th century near the super volcano, in 150 kilometres, was done a series of all-powerful nuclear bursts. Recent years the researchers inspected an extremal upheaval, there were registered constant shocks of earthquake.

The spacious Long Valley is penetrated with a network of hot wells, which activity has drastically increased. All these factors can be a reason of a closest awake of the super volcano. Notwithstanding the dangerousness, the picturesque valley was habited for thousands of years. There were found artefacts of 10 000 years old. Also, the researcher found sites of primitive men. The main find was pikes and tips of spears made from the pitch-stone. In 2000 the whole territory of Long Valley Caldera was turned into a national park. Next - Volcano Toba