Earthquakes
An earthquake's _______ is the place on the surface directly above the focus.
What is the epicenter?
Seismic vibrations are detected, measured, and recorded by these instruments.
What are seismographs?
This volcano type has the shortest life span, is made of mostly ejected lava fragments, and little to no lava.
They have the most violent types of eruptions.
What are composite or stratovolcanoes?
Energy from an earthquake travels in this direction.
What is all directions?
The further from an earthquake someone is, the _______ the time interval between P and S waves.
What is the greater the interval?
Fast moving, runny lava.
What is Aa lava or basaltic lava?
The Hawaiian Islands are...formed from...
What are shield volcanoes...hot spots?
The hypothesis explaining the release of energy during an earthquake.
What is the Elastic Rebound Hypothesis?
The name of the 1989 earthquake in the Bay Area.
What is the Loma Prieta earthquake?
Magma's silica content is directly related to its...
A violent mudflow during a volcanic eruption.
What is a lahar?
The waves that arrive first during an earthquake.
What are P waves or primary waves?
The layer of the earth that is liquid iron.
What is the outer core?
A major factor in determining the type of volcano.
What is the type of magma?
Compared to water, maple syrup has a ______ viscosity.
What is a high viscosity?
These are the most destructive seismic waves.
What are surface waves?
The force responsible for the movement of tectonic plates.
What is convection?
Formed when the top of a volcano collapses into an empty magma chamber.
What is a caldera?
A chamber of magma that cooled into rock underground.
What is a pluton?