Eruptions
caused by thick, viscous lava which holds a lot of pressure
Explosive
formed in layers with steep sides, can be explosive or effusive
Composite
Convergent boundaries
This is release when rocks break apart from the stress applied to them
Energy
Scale used to measure earthquakes based on observations
Mercalli Scale
fast moving surge of rocks, gases, and ash
pryoclastic flow
Short, steep sided, explosive with felsic lava
Cinder Cone
eruptions found in the middle of a plate that can be felsic or mafic and happen for unknown reasons
Hot spots
the 3 seimic wave types associated with earthquakes
Primary (P), Secondary (S), Surface (L)
a method of predicting volcano eruption based on the amount of SO2 in the air.
Gas emissions
effusive
gentle sloped sides with larger flatten crater at top
Shield
where rift eruptions cause narrow breaks in the crust, usually nonexpolsive(effusive)
Divergent boundaries
location of the rock fracture during the earthquake
focus
Scale used to measure earthquakes based on the amount of energy released and recorded on the seismogram
Richter Scale
rocks and dust falling from the sky
Pyroclastic fall
Low viscosity, faster, lower silica, dark colored lava
Mafic
Where plates rub together with great friction
Transform boundaries
Instructment used to measure changes in the Earth's surface motion.
Seismograph
Tilt
thick mud slide of molten lava
lahar
high viscosity, slower, high silica, lighter colored lava
Felsic
Daily Double!!!!!
What is the source that causes plates to move
Convection currents
Surface location of the central point of the earthquake
epicenter
Short Answer!!
What do we need to calculate the epicenter of earthquake?
Triangulation - Calculated distance from three seismographs. The epicenter is where the 3 circles overlap.