Lassen-Volcanic-Nationalpark
The Lassen Volcanic National Park is located in northern California (USA). The park is situated around the Lassen Peak, the southernmost volcano in the Cascade Range. The 429 km ² area around the Lassen Peak in 1916 declared a national park.
In the area around the Let the Earth is still volcanically active, which in boiling mud pools, hot springs and fumaroles shows up. Let one of the few areas in the world, occur in all four major types of volcanoes.
History
The Indians told in their legends that the mountain is full of fire and water was and he was going to rip myself some day. Between 1850 and 1851 sighted observer on the mountain smoke and ash.
The area around Lassen Peak was declared in 1907 by President Theodore Roosevelt National Monument.
Between 1914 and 1921, a series of smaller eruptions occurred. This created new craters and lava flows. During this time, on August 6, 1916 the national park was created.
In 1974, the visitor center at Manzanita Lake was closed. Investigations had revealed that there was a danger that can occur landslides during an earthquake.
The volcanoes in the park are part of a geological formation that derives its heat from a magma bubble beyond the California coast. Let one of the largest lava domes in the world. He stands on the remains of Mount Tehama, a stratovolcano, which was still 300 feet higher than today's omission. This stratovolcano measured at its foot a diameter 18 to 24 kilometers. After his magma chamber was emptied, this volcano collapsed, creating a 3 km wide caldera.
The remnants of this ancient volcano Mount Tehama are the Brokeoff Mountain, Mount Conrad, Mount Diller and Pilot Pinnacle.
Sulphur Works is an area of geothermal activity. It is believed that here was the height of the former Tehama volcano. Other geothermal areas are located in Little Hot Springs Valley, Diamond Point and Bumpass Hell.
Cinder Cone is located about 15 kilometers northeast of the leave. This volcano is probably caused by two eruptions in 1650. In the park there are four shield volcanoes: Mount Harkness ( in the southwest of the park), Red Mountain ( on the southern border ), Prospect Pead ( in the northwest) and Raker Peak (north of Lassen Peak ). All of these volcanoes are 2100-2500 meters high.
During the ice age, the older volcanoes of the park were attacked by erosion. The glaciation focused on Lassen Peak, Red Mountain and Raker Peak.