SEISMOLOGY

Question 1

is the study of the generation, propagation and measurement of seismic waves through earth and the sources that generate them.

Answer 1

SEISMOLOGY

Question 2

The earth’s shape is an

Answer 2

OBLATE SPHEROID

Question 3

the average specific gravity
of earth is about

Answer 3

5.5

Question 4

the outer part of the earth is where the life exist.

Answer 4

CRUST OR LITHOSPHERE

Question 5

is a 2900 km thick layer

Answer 5

MANTLE

Question 6

Upper Mantle reaching a
depth of about 400 km made of

Answer 6

OLIVINE AND PYROXENE

Question 7

Lower Mantle made of more
homogeneous mass of

Answer 7

MAGNESIUM, IRON OXIDE AND QUARTZ

Question 8

SPECIFIC GRAVITY OF MANTLE

Answer 8

5

Question 9

Core has a radius of

Answer 9

3470 km

Question 10

INNER CORE HAS A RADIUS OF

Answer 10

1370 Km

Question 11

the core is composed of

Answer 11

molten iron, nickel, sulfur or silicon

Question 12

proposed the hypothesis that the continents
had once formed a single landmass before breaking apart and drifting to their present locations.

Answer 12

German Scientist Alfred Wegener (1915)

Question 13

explains that the lithosphere is broken into seven large (and several smaller) segments called

Answer 13

PLATES

Question 14

He proposed that a large continent termed Pangae existed in earth around 200 million years ago and was surrounded by an ocean called.

Answer 14

PANTHALASA

Question 15

WHAT IS THE CONTINENTAL SIZED PLATES

Answer 15

African, American, Antarctic, Indo-Australian, Eurasian
and pacific plate

Question 16

are areas along the edges of plates move apart from each other

Answer 16

SPREADING RIDGES OR DIVERGENT BOUNDARIES

Question 17

are formed where the two plates move toward each other. In this process, one plate could slip below the other one or both could collide with each other.

Answer 17

CONVERGENT BOUNDARIES

Question 18

These boundaries are created when either oceanic lithosphere subducts beneath oceanic lithosphere (ocean-ocean convergence), or when oceanic lithosphere subducts beneath continental lithosphere (ocean-continent convergence).

Answer 18

SUBDUCTION BOUNDARIES

Question 19

When two plates with continental lithosphere collide, subduction ceases and a mountain range is formed by squeezing together and uplifting the continental crust on both plates,

Answer 19

COLLISION BOUNDARIES

Question 20

occur along the plate margins where two plate moves past each other without destroying or creating new crust

Answer 20

TRANSFORM BOUNDARIES

Question 21

is used to describe a discontinuity within rock mass, along which movement had happened in the past.

Answer 21

FAULT

Question 22

are mappable linear surface features and may reflect subsurface phenomena.

Answer 22

LINEAMENTS

Question 23

The region on the fault, where rupture initiates is known as the

Answer 23

FOCUS OR HYPOCENTER

Question 24

is the location on the earth surface vertically above the focus.

Answer 24

EPICENTER

Question 25

Distance from epicenter to any place of interest is called the

Answer 25

EPICENTRAL DISTANCE

Question 26

The depth of the focus from the epicenter is the

Answer 26

FOCAL DEPTH

Question 27

The higher diameter along equator is caused by the higher ________________ generated along the equator due to rotation of earth.

Answer 27

CENTRIFUGAL FORCE

Question 28

The oceanic crust is constituted by

Answer 28

BASALTIC ROCKS

Question 29

continental part by

Answer 29

GRANITIC ROCKS

Question 30

The mantle has an average temperature of about

Answer 30

2200 DEGREE CELCIUS

Question 31

The specific gravity of outer core is about

Answer 31

9-12

Question 32

The specific gravity of inner core is

Answer 32

15

Question 33

create shear stresses at the bottom of the plates which drags them along the surface of earth.

Answer 33

CONVECTION CURRENTS

Question 34

interior portion of a plate is usually tectonically quiet, earthquakes also occur far from plate boundaries

Answer 34

INTRA-PLATE EARTHQUAKES

Question 35

The earthquake that occurs at a plate boundary is known as

Answer 35

INTER-PLATE EARTHQUAKES

Question 36

It could be a fault, a joint or any other linear geological phenomena.

Answer 36

LINEAMENT

Question 37

is the direction of a horizontal line on the surface of the fault

Answer 37

STRIKE

Question 38

measured in a vertical plane at right angles to the strike of the fault

Answer 38

DIP

Question 39

The vertical shift along a fault plane is called

Answer 39

THROW

Question 40

the horizontal displacement is termed as

Answer 40

HEAVE

Question 41

the slippage occurred along the dip of the fault

Answer 41

DIP-SLIP FAULT

Question 42

the movement has taken place along the strike

Answer 42

STRIKE-SLIP FAULT

Question 43

The movement occurs diagonally across the fault plane

Answer 43

OBLIQUE SLIP FAULT

Question 44

the hanging wall has been displaced downward relative to the footwall

Answer 44

NORMAL FAULT

Question 45

the hanging wall has been displaced upward relative to the footwall

Answer 45

REVERSE FAULT

Question 46

the foot or the hanging wall do not move up or down in relation to one another

Answer 46

WRENCH FAULT

Question 47

which are a subdivision of reverse faults, tend to cause severe earthquakes

Answer 47

THRUST FAULT

Question 48

As the plate try to move relative to each other, strain energy gets built up along the boundaries

Answer 48

ELASTIC REBOUND THEORY