Mt. St Hellens On the 18th May, 1980, a huge explosion could be heard across the Cascade Mts, USA as Mt. St Hellens violently erupted. What caused the eruption? Mt.
MountStHelens.com Information Resource Center History - Mt. St. Helens Mount St. Helens, located in southwestern Washington about 50 miles northeast of Portland, Oregon, is one of several lofty volcanic peaks that dominate the Cascade Range of the Pacific Northwest; the range extends from Mount Garibaldi in British Columbia, Canada, to Lassen Peak in northern California. Geologists call Mount St. Helens a composite volcano (or stratovolcano), a term for steepsided, often symmetrical cones constructed of alternating layers of lava flows, ash, and other volcanic debris. Composite volcanoes tend to erupt explosively and pose considerable danger to nearby life and property. In contrast, the gently sloping shield volcanoes, such as those
This map also shows the area of the smoke plume from the eruption. Herculaneum is situated approximately 7 kilometres to the west of Mount Vesuvius, whereas Pompeii was approximately 9 kilometres to the south. SIGNIFICANCE IN PRESERVING EVIDENCE OF EVERYDAY ROMAN LIFE The eruption of Mount Vesuvius took citizens by surprise, no one knew the danger of the eruption, some
The last eruption happened in 1984, and we’re certain the volcano will erupt again, but for now we monitor Mauna Loa for any indication of its next eruption. Mauna Loa is named for the sub aerial part that extends 120 km at the southern tip and at the east-northeast coastline, therefore its name “Mauna Loa” meaning “Long Mountain”. Most Recent Eruption: March 24-April 15, 1984 Number of Historical Eruptions: 33 Oldest Dated Rocks: Between 100,000 and 200,000 years ago Estimated Age of Earliest Sub aerial Eruptions: About 400,000 years ago Estimated Age of First Eruption of Mauna Loa: Between 1,000,000 and 700,000 years before present Hawaiian Volcano Stage: Shield-forming stage.Mauna Loa aka Long Mountain in Hawaiian can be found on the island of Hawaii and is rising over 13, 680 ft. above sea level. The volcano has erupted 33-39 times, 1984 is the last time Mauna Loa has erupted. Mauna Loa has an estimated time of six years between each eruption, but on March 25, 2009 The Hawaiian Volcano Observatory celebrated the 25th anniversary of the volcanoes last eruption in 1984.
It created a lot of homes for the animals that are living in the park and became big attractions for visitors all around the world. The volcano in Yosemite Park erupted and the lava cause to make igneous rocks because of the cooling and solidification of the lava. Also the lava formed other rocks like granite and tonality are all form of plutonic rock, but also referred to as granitic rocks (Yosemite National Park). Plutonic rocks are compress with five minerals (Yosemite National Park). The plutonic rocks were formed by magma and are form deep within the Earth.
Cities are located near dangerous earthquake zones all throughout the country, from the most infamous on the West Coast to potential time bombs in the Midwest and even on the Eastern Seaboard. Stretching from northern Vancouver Island in Canada to northern California is the Cascadia subduction zone, where one giant plate of the Earth's surface is diving deep beneath another one. “The very largest earthquakes all occur on subduction zones”, said seismologist Geoffrey Abers at the Lamont-Doherty Earth Observatory of Columbia University in New York. "These are also the faults that make very large tsunamis that propagate across ocean basins to cause a lot of damage.” This means that our home state, Washington, falls into that “at risk” category. The earthquake threat in Washington is
How to predict an volcanic eruption Ground Deformation Ground deformation is the change in shape that happens before during or after a volcanic eruption. This happens because the sides of the volcano change shape because the magma in many ways to measure the change of shape of the volcano, like leveling, triangulation and more recently using continuous Global Positioning System (CGPS). It is also possible to use lakes as large tilt meters. Tilt meters measure the tiny degrees of tilt or slope on land. This is one of the oldest methods of knowing when ground deformation was caused because of rising lava.
(Some geologists argue that this portion of the Eurasian Plate is actually a fragment of the North American Plate called the Okhotsk microplate.) A part of the subduction zone measuring approximately 190 miles (300 km) long by 95 miles (150 km) wide lurched as much as 164 feet (50 metres) to the east-southeast and thrust upward about 33 feet (10 metres). (“Japan Earthquake and Tsunami of 2011, 1”) A series of extremely destructive tsunami waves followed the 9.0 earthquake along with the dozens of foreshocks and aftershocks that came with it. The city of Sendai, its surrounding area and airport were pounded by a wave
This is an analysis on what is known to be the largest earthquake and biggest tsunami ever to hit Japan on March 11, 2011. The earthquake and tsunami Japans coast lies in ruins after the earthquake hit followed by the tsunami picking up everything in its path like cars, houses, and warehouses. Seismometers, strain gages, and title gages records the disaster. P-waves travel at four miles a second and within seconds warnings flash across the country. The S-waves shake the ground making earthquakes so damaging and the reactor core is shut down (Kerger, 2011.
The December 26, 2004 Indian Ocean tsunami was caused by an earthquake that is thought to have had the energy of 23,000 Hiroshima-type atomic bombs. The epicenter of the 9.0 magnitude quake was under the Indian Ocean near the west coast of the Indonesian island of Sumatra. The violent movement of sections of the Earth’s crusts known as tectonic plates displaced an enormous amount of water, sending powerful shock waves in every direction. The tectonic plates in this area had been pushing against each other, building pressure for thousands of years – they continue to do so and will likely cause underwater earthquakes and tsunamis in the future. The shifting of the earth’s plates in the Indian Ocean on Dec. 26, 2004 caused a rupture more than 600 miles long, displacing the seafloor above the rupture by perhaps 10 yards horizontally and several yards vertically.