inner core crust mantle outer core
reverse fault
normal fault
strike-slip fault
thrust or reverse fault
normal fault
strike-slip fault
P Waves P Waves push and pull motion fastest-moving waves travel in straight path move through solid and liquid material
move in up-and-down zigzag pattern move more slowly than P waves cannot travel through liquid material S Waves S Waves
P wave
S wave
Love wave
Rayleigh wave
MercalliRichter measures magnitude measures destruction based on man’s observations
Richter Scale Effects
magma chamber vent lava ash side vent side vent crater
Classifying Volcanoes Classifying Volcanoes by shape by type of eruption by how often they erupt
by shape cinder cone shield composite cone hill-shaped with a bowl- like crater upside-down- saucer- shaped symmetrical, cone-shaped
shield volcano
cinder cone volcano
composite cone volcano
shield cinder cone composite cone
by how often they erupt extinct dormant active
has erupted during recorded history is expected to erupt again
dormant erupted in distant past not expected to erupt again
extinct does not have a recorded eruption is not expected to erupt
by type of eruption Plinian Pelean Vulcanian avalanche of red-hot dust and gases; pyroclastic flow violent, loud explosion of lava, ashes, cinders, and gases most powerful eruption, spewing lava, gas, and dust into atmosphere Hawaiian/ Strombolian quiet, runny lava; little or no cinder, ash, or steam