Q. What type of boundary is the Cascade Mountains?
convergent boundary
Q. What is the Cascade Range known for?
The Cascade Range or Cascades is a major mountain range of western North America, extending from southern British Columbia through Washington and Oregon to Northern California. It includes both non-volcanic mountains, such as the North Cascades, and the notable volcanoes known as the High Cascades.
Q. What are some of the greatest hazards associated with Cascade volcanoes?
The most significant threats are from volcanic ash and from the slurry of mud and debris within lahars. Even in the absence of eruption, the flanks of Cascade volcanoes can collapse, which result in landslides and debris avalanches that can destroy areas downslope from the collapse location.
Q. What caused the Cascade mountain range?
Melting of the Juan de Fuca Plate at depth intruded magma into the continental margin to form the Cascade Arc. The îblobî of volcanic rock riding on the top of the Juan de Fuca plate is the Crescent Basalt, unsuccessfully trying to subduct beneath the continent. These rocks were uplifted to form the Olympic Mountains.
Q. When a Cascade Volcano Erupts What are 4 possible hazards or consequences?
It also goes over the multiple hazards Cascades Volcanoes produce, including but not limited to, tephra (ash), lava flows, pyroclastic flows, and lahars. I learned that these hazards do pose risk to the population of the Pacific Northwest and that distance does play a role in the level of risk.
Q. Why is lahar so dangerous?
Lahars and excess sediment cause serious economic and environmental damage to river valleys and flood plains. Over a period of weeks to years after a volcanic eruption, the erosion and transportation of loose volcanic deposits can lead to severe flooding in areas far downstream from a volcano.
Q. Which volcano has recorded one of the deadliest volcanic eruption in the world?
Mount Tambora
Q. What province has the most number of active volcano?
Luzon
Q. Why did Mount Pinatubo erupt in 1991?
In March and April 1991, however, molten rock (magma) rising toward the surface from more than 20 miles (32 kilometers) beneath Pinatubo triggered small earthquakes and caused powerful steam explosions that blasted three craters on the north flank of the volcano.
Q. What type of eruption was Pinatubo 1991?
Huge pyroclastic flows roared down the flanks of Pinatubo, filling once-deep valleys with fresh volcanic deposits as much as 200 m (660 ft) thick….
| 1991 eruption of Mount Pinatubo | |
|---|---|
| Start date | April 2, 1991 |
| End date | September 2, 1991 |
| Type | Phreatic, Ultra-Plinian |
Q. How many times did Mt Pinatubo erupted?
Eruptions of Mount Pinatubo Pinatubo has had at least 6 periods of activity with large explosive eruptions in its past 35,000 years prior to the 1991 eruption.
