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increase in both frequency and intensity
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∙ 11y ago
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Why can earthquakes be a warning that a eruption is about to happen?
Movement of high pressure magma underground typically occurs before a volcanic eruption. This magma is under such a high pressure that it can cause hydraulic fracturing of the surrounding rocks and even bulging of the crust. Both these events will release seismic waves (cause earthquakes). All these data help geologists predict that an eruption is about to occur.
What causes an increase in the number and intensity of small earthquakes before an eruption?
Quakes move nearer to the surface as an eruption approaches. And these "microearthquakes" happen more frequently before an eruption, until all the seismometer can register is a distinctive vibration, slight but continuous, known as a harmonic tremor. The seismic activity associated with volcanism is usually as a result of pressure increases in the magma chamber....
What kind of eruptions would you expect from cascade volcanoes?
If the eruption was anything like the eruption of Mount Meager in 2350 BP, you would expect it to send an ash column high into the Stratosphere. This activity could produce a diverse sequence of volcanic deposit. A thick amount of welded vitrophyric breccia may appear on the explosive collapse of a possible appearance of a lava dome, admiting ash several meters in thickness near the vent area. But that is only if the eruption is anything like the Mount Meager eruption mentioned before.
Is an earthquake tougher than an erupting volcano?
Volcanoes are easier because enerally speaking, scientists can predict with a relatively good degree of certainty when a volcano will erupt. This is because most volcanoes follow a regular pattern of increasing seismic activity as the eruption approaches, usually in the form of small earthquakes. Earthquakes: On the other hand, earthquakes have proven to be notoriously difficult to predict because of the lack of regular patterns - sometimes they are preceded by a series of small earthquakes, and other times not. Scientists measure the severity of an earthquake on a (modified) Richter scale, where an increase of 1 unit represents 10 times more ground motion and 30 times more energy released. A magnitude 5 earthquake will be felt by most people in the vicinity, but do little damage to well-made buildings. A magnitude 7-8 earthquake will do major damage. No earthquake larger than a magnitude 9 has ever been recorded. The motion that this Richter scale measures is due to seismic waves that are generated at the center and subsequently travel through the Earth. Much like the use of radiation (electromagnetic waves) that are used in medicine to diagnose diseases, the way that these waves travel through the Earth can tell us a great deal of the structure of the inner Earth.
Why are many volcanoes found in the same areas that earthquakes occur?
Movement of high pressure magma underground typically occurs before a volcanic eruption. This magma is under such a high pressure that it can cause hydraulic fracturing of the surrounding rocks and even bulging of the crust. Both these events will release seismic waves (cause earthquakes). All these data help geologists predict that an eruption is about to occur.
What kinds of unusual activity might be noticed before a volcanic eruption?
no there were not
What happens before volcanic eruptions?
In general the land surface inflates and there is minor (local) seismic activity).
What is post volcanic phenomena?
post-volcanic phenoma are the things which happen before an eruption.
What almost always comes before a volcanic eruption?
An earthquake
What types of updates are provided before a volcanic eruption occurs?
Earthquakes
Precautionary measures before and after volcanic eruption?
what precautionary mesures beforeand after
Can you predict when volcanoes occur?
Sort of, before volcanos erupt there is often a lot of detectable seismic activity. Howeer you can have similar seisimc activity without an eruption; and there have been eruptions were there was little seismic activty immediately prior to the event.Seismologists are getting better at predicting eruptions, but they still have a lot of work yet to do.
What types of updates are provided before a volcanic eruption?
The only updates available before a volcanic eruption are those issued by local meteorologists and geologists. They can issue updates based on observed changes in the volcano.
Where should i go before an volcanic eruption?
Preferably, to a safe distance from the volcano.
Why can earthquakes be a warning that a eruption is about to happen?
Movement of high pressure magma underground typically occurs before a volcanic eruption. This magma is under such a high pressure that it can cause hydraulic fracturing of the surrounding rocks and even bulging of the crust. Both these events will release seismic waves (cause earthquakes). All these data help geologists predict that an eruption is about to occur.
What happens before a volcanic eruption?
magma falls from underground to form an opening in the volcano
What type of updates are provided before volcanic eruption occurs in Alaska?
balls and stuff
