1980 Mount St. Helens | |
|---|---|
| Total costs | N/A |
| Deaths | 57 |
On March 27, 1980, a series of volcanic explosions and pyroclastic flows began at Mount St. Helens in Skamania County, Washington, United States. A series of phreatic blasts occurred from the summit and escalated until a major explosive eruption took place on May 18, 1980. The eruption, which had a Volcanic Explosivity Index of 5, was the most significant to occur in the contiguous United States since the much smaller 1915 eruption of Lassen Peak in California. It has often been declared the most disastrous volcanic eruption in U.S. history. The eruption was preceded by a two-month series of earthquakes and steam-venting episodes caused by an injection of magma at shallow depth below the volcano that created a large bulge and a fracture system on the mountain's north slope. An earthquake at 8:32:11 am PDT (UTC−7) on Sunday, May 18, 1980 caused the entire weakened north face to slide away, creating the largest landslide in recorded history. This allowed the partly molten rock, rich in high-pressure gas and steam, to suddenly explode northward toward Spirit Lake in a hot mix of lava and pulverized older rock, overtaking the landslide. An eruption column rose 80,000 feet (24 km; 15 mi) into the atmosphere and deposited ash in 11 U.S. states and two Canadian provinces. At the same time, snow, ice, and several entire glaciers on the volcano melted, forming a series of large lahars (volcanic mudslides) that reached as far as the Columbia River, nearly 50 miles (80 km) to the southwest. Less severe outbursts continued into the next day, only to be followed by other large, but not as destructive, eruptions later that year. Thermal energy released during the eruption was equal to 26 megatons of TNT.About 57 people were killed, including innkeeper and World War I veteran Harry R. Truman, photographers Reid Blackburn and Robert Landsburg, and geologist David A. Johnston. Hundreds of square miles were reduced to wasteland, causing over $1 billion in damage (equivalent to $3.5 billion in 2020), thousands of animals were killed, and Mount St. Helens was left with a crater on its north side. At the time of the eruption, the summit of the volcano was owned by the Burlington Northern Railroad, but afterward, the railroad donated the land to the United States Forest Service. The area was later preserved in the Mount St. Helens National Volcanic Monument.
Source: Wikipedia 1941 Huaraz avalanche | |
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| Total costs | N/A |
| Deaths | 6000 |
Huaraz ([waˈɾas]) (from Quechua: Waraq or Waras, 'dawn'), founded as San Sebastián de Huaraz, is a city in Peru. It is the capital of the Ancash Region (State of Ancash) and the seat of government of Huaraz Province. The urban area's population is distributed over the districts of Huaraz and Independencia. The city is located in the middle of the Callejon de Huaylas Valley and on the right side of the river Santa. The city has an elevation of approximately 3050 metres above sea level. The built-up area covers 8 km2 and has a population of 120,000 inhabitants, making it the second largest city in the central Peruvian Andes after the city of Huancayo. It is the 22nd largest city in Peru. Huaraz is the seat of the province's Roman Catholic Bishop and the site of the cathedral. Huaraz is the main financial and trade center of the Callejón de Huaylas and the main tourist destination of Ancash region. Moreover, is one of the biggest towns in the Peruvian Andes. Huaraz is the main destinations for winter sports and adventure. Many visitors from around the world come to the city for practicing sports as climbing, hiking, mountain biking and snowboarding, and also to visit the glaciers and mountains of the Cordillera Blanca, mainly Mount Huascarán, which is considered the tallest mountain in tropics, all of them located in Huascarán National Park which UNESCO declared a nature world heritage site. The city was founded before the Inca Empire when humans settled around the valley of the Santa River and Qillqay. Its Spanish occupation occurred in 1574 as a Spanish-indigenous reducción. During the wars for the independence of Peru, the whole city supported the Liberating Army with food and guns, earning the city the title of 'Noble and Generous City' granted by Simón Bolívar. In 1970, 95% of the city was destroyed by an earthquake that damaged much of Ancash Region. 25,000 people died. The city received much foreign assistance from many countries. For this reason the city was named a capital of International Friendship. The main economic activities in the city are farming and tourism. Since Huaraz has tourist infrastructure supporting the Ancash Highlands, the city is the main point of arrival for practitioners of adventure sports and mountaineering. Along with the snowy peaks of the Cordillera Blanca, one can visit archaeological sites like Chavín de Huantar and the eastern highlands of Ancash, known as Conchucos.
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