Cascadia Fault
When was the last Cascadia Fault earthquake?
1700
Type of fault boundary that produces the largest earthquakes and subsequent tsunamis
Subduction zone
•What are two types of waves generated by an earthquake that travel through the Earth? (Body Waves)
P waves and S waves
The instrument used to record earthquakes
Seismograph
An earthquake wave that travels by compressing the material in front of it and expanding the material behind it
P (primary) wave
What is the average recurrence interval for the Cascadia Fault?
246.5 years
A forest that has died after being inundated by saltwater
Ghost Forest
The zone where no body waves are detected by seismographs
Shadow zone
What category of earthquake wave results in the greatest amplitude of shaking?
Surface waves
The increase in water pressure leads to soil particles moving apart.
Liquefaction
What is an indirect impact that Idaho will experience from the earthquake?
Highway infrastructure may be damaged due to heavy use during response and recovery operations.
3 layers that would indicate tsunami deposits (bottom to top)
Topsoil, Sand, Tidal mud
Can travel through solids, liquids and gases
P (Primary) waves
The difference between the focus and the epicenter
The focus is the place within the Earth where that slippage occurred. The epicenter is the location on the Earth's surface directly above the focus.
The freeway collapse in the Loma Prieta earthquake was due to this phenomenon
Wave amplification
What cultures written records pinpointed the time and date of the last Cascadia Fault earthquake?
Japanese
An underwater landslide
Turbidity current
Travels with an up and down shearing motion
S (secondary) waves
To determine an earthquakes epicenter, you need ________ seismographs to ___________.
Three, Triangulate
Measures the magnitude of the earthquake
Richter scale
Areas that will be hit first by the tsunami, may have as little as ________ minutes of warning.
10
The buildup of strain is released when the strain overcomes the strength of the rock
Elastic Rebound Theory
Description for how Rayleigh waves travel
Like ocean waves
The Moment Magnitude measures an earthquakes______
Energy
Travel motion of Love waves
Horizontal or lateral shearing motion