Causes
With the range of data avalaible today, geologists will tell you this about earthquake predictions.
That they cannot not know when or where an earthquake can happen.
These are the first waves from an earthquake to arrive and move by compressing and expanding the ground like an accordion.
What are P or Primary waves?
The San Andreas fault in California is this type of fault.
What is a strike-slip fault?
This scale uses a seismograph to rate its size.
What is a Richter Scale?
This is a large area of flat land elevated high above sea level.
What is a plateau?
These are vibrations that are similar to sound waves.
What are seismic waves?
These waves come after P waves.
What are S or secondary waves?
In a normal fault, the part that lies below the other part is called this.
What is the footwall?
A seismograph uses this at the end of the device to mark the paper on the drum.
What is a pen?
The collision of two plates can cause this, just like the Himalayas.
What is a folded mountain?
This is the area beneath the Earth's surface where rock breaks under stress and triggers an earthquake.
What is the focus?
These waves move the slowest and are felt when both P and S waves arrive.
What are Surface waves?
Stress that pushes a mass of rock in two opposite directions is called this.
What is shearing?
This scale rates the amount of damage done by an earthquake and is useful where there aren't many instruments avalaible to measure the earthquake's strength.
What is the Modified Mercalli Scale
A fold in the rock that bends upward into an arch is called this.
What is an anticline?
This is the point on the surface directly above where the earthquake happens.
What is the epicenter?
These waves make the ground roll like the ocean and cause the most severe ground movements.
What are Surface waves?
This type of stress causes reverse faults.
What is compression?
This rating system estimates the total energy released by an earthquake.
What is the moment magnitude scale?
A block of rock that lies above a fault is called this.
What is a hanging wall?
You need these many points when charting an earthquake's epicenter.
These waves cannot move through liquids.
What are S waves?
The stress force that pulls on the crust where two plates are moving apart is called this.
What is tension?
This is the ratio of increase in magnitude of the moment magnitude scale.
What is 32 times more energy?
This is what forms when the hanging walls of two normal faults drop down on either side of the footwall.
What is a fault-wall mountain?