Scientific report on Laki eruption Laki volcano September marks the anniversary of the famed eruption in Iceland — one of the largest volcanic eruptions in recorded history. It did have a profound impact on people living around the entire Northern Hemisphere for years afterwards by killing almost half of the world's population and almost all of Iceland's livestock. Map of Iceland Iceland sometimes referred to in full as the Republic of Iceland is a Nordic island country marking the juncture between the North Atlantic and the Arctic Ocean, on the Mid-Atlantic Ridge. The country has a population of 321,857 and a total area of 103,000 km2 (40,000 sq mi), which makes it the most sparsely populated country in Europe. The capital and largest city is Reykjavík, with the surrounding areas in the southwestern region of the country being home to two-thirds of the country's population.
Mount St. Helens is a volcanic mountain in the Cascade Range in North America, in the state of Washington. It is, perhaps, the most famous mountain in the range, and certainly is the most active volcano in the area today. In fact, it has probably been the most active of the Cascade volcanoes for over 4000 years. On May 18th, 1980, the mountain erupted. Becoming one the largest volcanic eruptions in U.S history.
The Cascade Range extends from southern British Columbia through Washington and Oregon to Northern California. It is a part of the Cascade Volcanic Arc. Mount St. Helens has the most seismically active volcanoes in the Washington and Oregon Cascades. In an average month, 22 events are located by the Pacific Northwest Seismic Network, with the number going far higher during eruptive periods. Mount St. Helens lies on a Convergent boundary plate.
The oldest ash deposits were erupted at least 40,000 years ago onto an eroded surface that's still older volcanic and sedimentary rocks. Intermittent volcanism continued after the glaciers disappeared, and nine main pulses of pre-1980 volcanic activity have been recognized. Two months before the big explosion there was a 4.1 magnitude earthquake that hit underneath Mount Saint Helens, then seven days after that a 250 foot hole was in the mountain and released a plume of ash. The entire area was evacuated. Then on May 18, 1980 it happened, 57 people were killed, over 7,000 animals were killed as well.
St. Helens is a very closely monitored volcano due to its previous eruptions. It is one the most seismically active volcanoes in the Washington and Oregon Cascades. Since establishing a full seismic monitoring network in 1980 the millions of
The Columbia Plateau province is enclosed by one of the world’s largest accumulations of lava. Over 500,000 square kilometers of the Earth's surface is covered by it. The topography here is dominated by geologically young lava flows that flooded the countryside with amazing speed, all within the last 17 million years. Over 170,000 cubic kilometers of basaltic lava, known as the Columbia River basalts, covers the western part of the area. These tremendous flows erupted between 17-6 million years ago.
The tremendous eruption of Mount Tambora in April 1815 was the most powerful volcanic eruption of the 19th century. The eruption and the tsunamis it triggered killed tens of thousands of people. And the magnitude of the explosion is difficult to fathom. It has been estimated that Mount Tambora stood approximately 12,000 feet tall before the 1815 eruption, and the top 4,000 feet of the mountain was completely obliterated. Adding to the disaster's massive scale, the huge amount of dust blasted into the upper atmosphere by the Tambora eruption contributed to a bizarre and highly destructive weather event the following year.
One of Yosemite natural wonders are two giant monoliths known as, Half Dome and El Capitan. Half Dome is one of the biggest rocks in Yosemite. Half Dome was made by a glacier during the Ice Age. (National Park Service) The rock soars over 8,842 feet and 4,733 feet above the valley floor. (Shannon Tech) It is located in Yosemite Valley, near Mariposa County on the southeast side of the park.
9, 000 of those being foreigners. The Tsunami’s energy was so great the wave traveled around the world three times. Seven years later in 2011 an earthquake 60km off the east coast of Tohoku with a magnitude of 9.0 on the Richter scale struck Japan. The earthquake triggered a huge Tsunami which reached heights of 133 ft. and killed around 15, 839 people, injured 5950 and left 3642 unaccounted for. Causes When a dense oceanic plate collides with a less dense continental plate the denser oceanic plate subducts under the less dense continental plate.
The ironic thing is that the lowest point in N. America is only 84.5 miles East, South-East of Mount Whitney, which coincidently is the highest point in the Contiguous U.S. Death Valley also holds the highest reliable temperature in the Western hemisphere at 134 degrees hich was recorded 1913. Death Valley has a long and complex history of metamorphism, sedimentary deposits, and igneous intrusions throughout its history. The oldest rocks at Death Valley are from the early Proterozoic era during the Precambrian Eon. The basement rocks that are found here are a complex mix of metamorphosed sedimentary and igneous rocks. They are believed to be no older than 1.8 Billion years old (which are the oldest known rocks in the area).