Earthquakes
What is a seismologists
Scientists that study earthquakes
What is a volcano?
A volcano is a vent in Earth's crust through which melted or molten rock flows.
What is a seismic wave
Waves that originate where rocks first move along the fault, at a location inside the Earth.
What are volcanoes classified for
They are classified for there shapes and sizes
When magma surfaces it might erupt as a lava flow True or false?
True
what are earthquakes
Vibrations in the ground that result from movement along breaks in Earths lithosphere.
what do earthquakes do when they erupt
They form large mountains, create new crust, and leave a path of destruction behind.
During an earthquake how do seismic waves happens
A rapid release of energy along a fault produces seismic waves
Does magma composition and eruptive style of the volcano contribute to the shape
yes
Volcanic ash
Tiny particles of pulverized volcanic rocks and glass high into the atmosphere
How do faults occur earthquakes
When rocks move in any directional long fall.
If magma has a low silica content and also has a ____ viscosity
low
Primary waves
They cause particles to move in a push pull motion
Composite volcanoes
large steep sided volcanoes that result from explosive eruptions of and andesitic and rhyolitic lava and ash along convergent plate boundaries
Does magma chemistry determine the volcanic eruption style/the explosive behavior of a volcano is affected the amount of dissolved gases.True or false?
True
what plate boundary is associated with deep earthquakes
Convergent boundaries
what does the ring of fire represent
The ring of fire represents an area of an earthquake and volcanic activity that surround the Pacific Ocean
Secondary waves
They cause particles to move up and down at right angles
Shield volcanoes
They are divergent along plate boundaries and oceanic hot spots
What is ash fall
Ash fall is when volcanoes shoot large volumes of volcanic ash. also its a mixture of particles or pulverized rock and glass
How do you find the distance to the epicenter of earth
Use a graph with a P-wave and S-wave lag time plotted against distance. Look at the y axis and locate the place on the solid blue line that intersects with the lag time that you calculated from the seismogram. Then read the corresponding distance from the epicenter on the x- axis.
How much volcanoes are active in the USA potentially
60 volcanoes
Surface waves
They cause particles to move up and down in a rolling motion
Cinder cones
small steep sided volcanoes that erupt gas rich basaltic lava
What is Pyroclastic flow
When a volcano erupts and it produces fast moving avalanches of hot gas, ash, and rock called Pyroclastic flow.