[36][54], The areas surrounding Lassen Peak, especially to its east, south, and southeast, represented a meeting ground for Maidu, Yana, Yahi, and Atsugewi Native Americans. At Bumpass Hell, these features are at their most vigorous, with temperatures reaching 322 °F (161 °C) at Big Boiler, the park's biggest fumarole and one of the hottest hydrothermal fumaroles in the world. [64] Over the past 300,000 years, the Lassen Peak area has produced more than 30 lava domes, Lassen Peak being the largest. [88] Lassen Peak is one of four Cascade volcanoes that has undergone subsidence since 1990, with Medicine Lake Volcano, Mount Baker, and Mount St. Helens. It is a part of Lassen Volcanic National Park which is a group of more than 30 volcanic domes. Finch RH (1929) The origin of Lassen mudflows. [79] In the case of signs that suggest impending volcanic activity, the United States Geological Survey has a plan in place to utilize portable monitoring instruments, deploy scientists to the area,[44] and implement an emergency response plan developed by the National Park Service if an eruption were imminent. To monitor this threat, Lassen Peak and the surrounding vicinity are closely observed with sensors by the California Volcano Observatory. J. Volcanol. [55] After the California Gold Rush brought increased numbers of settlers into the area,[55] Lassen Peak was named in honor of a Danish blacksmith, Peter Lassen,[57] who guided immigrants past the peak to the Sacramento Valley during the 1830s. Lassen Peak and Mount Shasta are both volcanoes that are part of the Cascade mountain range, which runs across Northern California, Oregon, and Washington. CRATER RIM PLUNGES INTO FIERY PIT -- MUD MELTS SNOW, CAUSING FLOOD. [41] No volcanic activity took place 190,000 years ago to roughly 90,000 years ago,[64] but during the last 100,000 years, there have been at least 12 periods of eruptive activity in the Lassen volcanic center,[47] and since 90,000 years ago, the Twin Lakes sequence has been producing mixed lavas with variable appearances and compositions, including andesite and basaltic andesite lava flows and agglutinated volcanic cones (made of fused pyroclastic rocks) located by the Lassen domefield. Prior to settlement by immigrants in the 1800s, the area was inhabited by Native Americans. The lava mixed with snow and rock to form a lahar (volcanically induced mudslide, landslide, and debris flow), 0.5 miles (0.80 km) in width, which coursed down the side of the volcano, traveling 4 miles (6.4 km) and reaching Hat Creek. The region has remained silent for over 100 years. Easily reached along the main park road, the parking area at Sulphur Works gives you a good glimpse of the roaring steam vents and volcanic-gas vents known as fumaroles. Their activity varies based on the season; during the spring, when meltwater is more abundant, fumaroles and pools of water have lower temperatures, while mudpots have more fluid mud supplies. Lassen Peak, shown here, is the southernmost active volcano in the Cascade Mountain Range of western North America, extending from southern British Columbia to northern California. Besides Mt St. Helens, it is the only volcano in the contiguous US that erupted in the 20th century. [91] As the second-tallest volcano in Northern California, trailing only Mount Shasta,[9] Lassen Peak is frequently visited by climbers and hikers from around the world. Lassen Volcanic National Park is an American national park in northeastern California.The dominant feature of the park is Lassen Peak, the largest plug dome volcano in the world and the southernmost volcano in the Cascade Range. Having the distinction of being the most southerly active volcano in the whole of the Cascades, Lassen Peak is an eye-catching feature that hulks high above the park. Lassen Peak, also called Mount Lassen, volcanic peak in northern California, U.S., the principal attraction of Lassen Volcanic National Park. Originally silent, the film features sound effects added by his grandson, Craig Martin. In May 1917, an especially strong steam explosion formed the northern crater on Lassen Peak's summit,[70] with eruptions lasting two days and producing an ash cloud that extended 10,000 to 12,000 feet (3,000 to 3,700 m) into the sky. [92] The summit opens for use most years near the end of June, remaining in use until heavy snow falls in October or November. Photos from Lassen Peak volcano Lassen Peak volcano (California) - photos (73 Images) The "Great Explosion" eruption column of May 22, 1915 was seen as far … Simultaneously, dacite lava with lower viscosity than dacite from the previous eruption filled the summit crater, overflowing and extending in two streams for 1,000 feet (300 m) down the mountain's western and northeastern sides. Map Legend. [36], The only Cascade volcano with an elevation above 10,000 feet (3,000 m) that is not a stratovolcano,[7] Lassen Peak is a rhyodacitic lava dome. [70] The United States Geological Survey, in cooperation with the National Park Service, has been monitoring Lassen Peak and other volcanic areas in the park with tiltmeters, seismometers, and inclinometers. Hello Rangers! Lassen Peak, commonly referred to as Mount Lassen, is the southernmost active volcano in the Cascade Range of the Western United States. [56] Because the area was not suitable for permanent habitation, there is relatively scarce archaeological evidence of a native presence in the Lassen area. There were no deaths when the Lassen Peak, CA volcano erupted in 1915. The eruption column could be seen as far as 150 miles away. Finch RH (1930) Mudflow eruption of Lassen mudflows. Volcano Ltr. [10] Within the past 1,000 years or so, activity at Lassen Peak has produced six dacite lava domes, erupted tephra and pyroclastic flows, and built Cinder Cone and the Fantastic Lava Beds. Lassen Volcanic National Park covers a total area of 106,000 acres. It is the southernmost active volcano in the Cascade Range. The most recent three notable eruptions were: Chaos Crags (1,100 years ago), Cinder Cone (1666 A.D.), and Lassen Peak (A.D. 1914 to 1917). [63], Between 385,000 and 315,000 years ago, volcanism at the Lassen center shifted from andesitic stratovolcano construction to production of dacite domes. 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