Earthquake

Question 1

Where are the Tectonic Plates located?

Answer 1

The Tectonic plates are located in the lithosphere, above the Asthenosphere.

Question 2

What causes plates to form?

Answer 2

Plates are formed due to the heat from the inner core, causing the crust to break apart.

An example of this is a bread in the oven, when the oven is baked, the outer layer breaks apart due to the heat, but not not fully breaking apart.

Question 3

What are Tectonic Plates?

Answer 3

A massive, irregularly shaped slab of solid rock.

Question 4

What are plate boundaries?

Answer 4

The plate boundary is the edge of the plate to another plate.

Question 5

What are the two types of plates?

Answer 5

The Continental and Oceanic Plates.

Question 6

Which is denser, the Continental or the Oceanic Plate?

Answer 6

The Oceanic Plate

Question 7

Is lower density on top or bottom?

Answer 7

Lower density is always on the bottom, because the higher the density the more the mass an object has, resulting it to sink down the bottom, or to be always on the bottom.

Question 8

What is a Fault?

Answer 8

Faults are cracks in the Earth’s crust along which there is movement.

It is formed in the Earth’s crust as a brittle response to stress. Generally, the movement of the Tectonic plates provide the stress, and rocks at the surface break in response to this.

Question 9

What causes Earthquakes?

Answer 9

Plate movements

Question 10

What are the seismic waves the is released during an earthquake?

Answer 10

1. P-Wave (Primary Wave)
   The first seismic wave detected by seismographs, able to move through liquid and solid rocks.
2. S-Wave (Secondary Wave)
   The second wave detected by the seismograph, travels slower than P-Wave because S-Waves do not travel through liquid.
3. Rayleigh Waves
   Surface wave, move in an elliptical motion.
4. Love Waves
   Surface waves,

Question 11

What seismic wave causes the damage during the earthquake?

Answer 11

The Secondary Wave or the S-Waves.
It is much more destructive than the P-Wave.

Question 12

What records the seismic waves?

Answer 12

The seismograph

Question 13

What are seismic waves?

Answer 13

Waves that are caused by an earthquake.

Question 14

How many seismic station does it take to accurately record the location of the epicenter?

Answer 14

It takes three seismic station.

Question 15

What is the epicenter?

Answer 15

The point on the Earth’s surface directly above the focus is the epicenter.

Question 16

What is the Focus?

Answer 16

It is the place inside the Earth’s crust where an earthquake originates.

Question 17

What is the formula to compute the location of the epicenter from the seismic stations?

Answer 17

Td/8sec. ×100km

Where:
Td - Time difference in the arrival between the P-waves and S-waves
8 seconds - The interval between the times of arrival of the P-waves and S-Waves in a distance of 100km