Volcano Types
A volcano that will never erupt again
What is extinct?
A bowl shaped area that may form around the top or the central vent.
What is a crater?
an event that occurs naturally and can have a negative impact on people
What is natural hazard?
This scale measures the magnitude of seismic waves from 1-10.
What is the Richter Scale
A crack where earthquakes occur WITHIN A PLATE
What is a fault?
A volcano that is sleeping or not active but could erupt again.
What is dormant?
It sits on both a hot spot and a divergent boundary.
Why does Iceland have so much volcanic activity?
to reduce the impact of an event
What is mitigate?
vibrations caused by an earthquake
What are seismic waves?
the location on the surface directly above the focus where most of the shaking occurs
What is the epicenter?
Nonexplosive thin lava flows out and hardens and builds up in layers.
What is a Shield volcano?
A place where one plate subducts under another plate, mixes with mantle, melts and forms a volcano
What is a convergent boundary?
the number of times an event happens in a specific amount of time
What is frequency?
The machine that records the type of wave, the strength of the wave and the time the wave arrives.
What is seismograph?
Country that sits on 4 tectonic plates and builds tall buildings on top of rubber shock absorbers
What is Japan?
Explosive ash, cinders, and pyroclastic material build up in a steep pile around a volcano’s vent.
What is a cinder cone volcano?
US state on a hot spot, where magma is hotter than surrounding magma, rising to the crust on a moving plate.
What is Hawaii?
the strength or intensity of an event, represented by a numerical scale
What is magnitude?
The vertical or horizontal shaking that people feel are caused by this
What are surface waves?
Body waves, inside Earth, have (shorter/longer) wavelengths and travel (slower/faster/same) compared to surface waves.
What is shorter, faster than?
Sometimes there are violent eruptions, sometimes lava flows from it and sometimes it is quiet.
What is a composite volcano?
Three precursor events that predict an eruption
What are small earthquake, release of gas, & change of volcano shape?
smaller events that often lead to a final event
What are precursor events?
Earthquakes can cause this large, destructive water wave
What is tsunamis?
Two boundaries where Earthquakes occur
What are convergent and transform boundaries?