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What were the first signs of activity of Pinatubo in spring 1991?
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How did scientists know to evacuate 85000 people before Mt Pinatubo erupted in May 1991?
First, the main eruption was in June, not May. There were a number of signs, starting with earthquakes and steam explosions indicating the volcano was becoming active. Gas measurements and later earthquakes clearly showed that magma was rising. The volcano's activity gradually escalated until its climactic eruption. When a lava dome appeared on the flanks, it was a sign that Pinatubo was about ready to blow. Furthermore, by studying deposits in the surrounding area, scientists knew that Pinatubo was prone to very large eruptions and so represent a very great danger.
Can volcanoes suddenly become restless and erupt withing one week of the first signs of activity?
Yes...yes it can, but it almost always shows the tell-tale signs weeks before
Why might it be important to learn about a volcano that erupted many years ago?
Studying past eruptions of a volcano can allow scientists to understand how it might erupt in the future, which helps determine what areas are in danger and what threats they face. A great example would be that of Mount Pinatubo in the Philippines. When it started showing signs of activity in 1991, one of the first steps scientists took was to study evidence from past eruptions. They found that Pinatubo had a long history of very large violent eruptions. Nearly everyone within 15 miles of the volcano was evacuated. The eruption that followed was one of the largest ever recorded, but timely evacuations saved an estimated 20,000 lives.
What are signs that an volcano is going to occur?
increased seismic activity in the area, swelling of the magma dome (in andesite volcanoes), increase in surface temperature.
Is long valley caldera extinct?
No. It last erupted a few hundred years ago and has been showing signs of renewed activity since 1980.
What flower is one of the first signs of spring?
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The first organ system that shows any signs of activity is the?
The first organ system that shows any sign of activity is the
A Geneva official watches what each year for the first signs of spring?
A chestnut tree.
How did scientists know to evacuate 85000 people before Mt Pinatubo erupted in May 1991?
First, the main eruption was in June, not May. There were a number of signs, starting with earthquakes and steam explosions indicating the volcano was becoming active. Gas measurements and later earthquakes clearly showed that magma was rising. The volcano's activity gradually escalated until its climactic eruption. When a lava dome appeared on the flanks, it was a sign that Pinatubo was about ready to blow. Furthermore, by studying deposits in the surrounding area, scientists knew that Pinatubo was prone to very large eruptions and so represent a very great danger.
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Are there signs of volcanic activity on Jupiter?
No there is no signs of volcanic activity on Jupiter because Jupiter is a gas giant and has no land masses on which to have a volcano on.
Can volcanoes suddenly become restless and erupt withing one week of the first signs of activity?
Yes...yes it can, but it almost always shows the tell-tale signs weeks before
What do you do when your house is showing signs of paranormal activity?
Leave, now
Why might it be important to learn about a volcano that erupted many years ago?
Studying past eruptions of a volcano can allow scientists to understand how it might erupt in the future, which helps determine what areas are in danger and what threats they face. A great example would be that of Mount Pinatubo in the Philippines. When it started showing signs of activity in 1991, one of the first steps scientists took was to study evidence from past eruptions. They found that Pinatubo had a long history of very large violent eruptions. Nearly everyone within 15 miles of the volcano was evacuated. The eruption that followed was one of the largest ever recorded, but timely evacuations saved an estimated 20,000 lives.
What are some areas that show signs of eruptions or volcanic activity in California?
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