earth 3

Question 1

-The point on Earth’s surface directly above the focus.
-Where earthquake waves reach first and receives the greatest impact from the earthquake

Answer 1

Epicenter

Question 2

-The point of the initial movement, or energy release, along the fault.
-Generally located underground (from a few
miles to several hundred miles depth)

Answer 2

Focus

Question 3

85% of the total energy
 The focus is within (10-70 km deep) of the Earth’s surface.

Answer 3

Shallow

Question 4

about 12% of energy
 focal depth range of 70-300 km.

Answer 4

Intermediate

Question 5

more than (>300 km) below the Earth’s surface.

Answer 5

Deep

Question 6

Underwater earthquake associated with oceanic floor
➢ Speed of 700-800 km/h, high as 10-20 meters

Answer 6

TSUNAMI

Question 7

Causes of tsunami

Answer 7

✓ Underwater landslide,
✓ volcanic eruption,
✓ meteorite impact in the ocean, and
✓ other movement of the ocean floor

Question 8

used by geologists to study and measure the strength of an earthquake

✓ An instrument that detects and measures waves.
✓ Consists of weight attached to a spring or wire (because the weight is not attached directly to Earth, it will remain nearly still even when Earth moves)
✓ A pen attached to the weight records any movement on a sheet of paper wound around a constantly rotating drum

Any horizontal ground motion will be recorded when the mass swings away from the frame.

Any vertical motion will be recorded when the mass bounce up and down against the spring.

Answer 8

SEISMOGRAPH

Question 9

✓ internal part of the seismograph, which may be a pendulum, or a mass mounted on a spring; however, it is often used synonymously with “seismograph

Modern Seismograph

Answer 9

SEISMOMETER

Question 10

✓ Trace/data produced by the seismometer, which shows the ground motion at a specific measuring station recorded against time

Answer 10

SEISMOGRAMS