Which earthquakes are also called as ‘crustal earthquakes’?

[A] Shallow focus earthquakes
[B] Deep focus earthquakes
[C] Both 1 & 2
[D] Neither 1 & 2

what are the two primary types of waves generated by earthquakes?

What is an earthquake measuring divice called? 

What do the two stars near the center of this block represent?

a) location of the earthquake
b) the star at depth is the place where the earthquake is generated
c) the star at depth is the hypocenter
d) the star on the surface is the epicenter
e) All of the Above