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천,☄️ > SCIENCE > Flashcards

SCIENCE Flashcards

1
Q

What is the point on the Earth’s surface directly above the earthquake’s focus called?

A

Epicenter

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2
Q

True or False: The epicenter is always located at the surface of the Earth.

A

True

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3
Q

In which direction do seismic waves radiate from the earthquake epicenter?

A

In all directions

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4
Q

What is the term for the location within the Earth where an earthquake originates?

A

Focus

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5
Q

The epicenter is usually located how far from the earthquake’s focus?

A

On the Earth’s surface directly above the focus

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6
Q

What instrument is used to determine the location of an earthquake epicenter?

A

Seismograph

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7
Q

What is the term for the study of the distribution of earthquakes in time and space?

A

Seismology

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8
Q

Fill in the blank: The epicenter is the point on the Earth’s surface that is ________ above the earthquake’s focus.

A

Directly

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9
Q

What type of waves are the first to reach a location after an earthquake?

A

P-waves

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10
Q

What type of waves are the most destructive and cause the most damage during an earthquake?

A

Surface waves

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11
Q

What is the name of the scale used to measure the magnitude of an earthquake?

A

Richter scale

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12
Q

What is the name of the scale used to measure the intensity of an earthquake’s effects?

A

Modified Mercalli Intensity scale

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13
Q

True or False: The Richter scale measures the intensity of an earthquake’s effects.

A

False

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14
Q

What is the term for the point within the Earth where an earthquake originates?

A

Focus

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15
Q

What is the name of the phenomenon where two seismic waves overlap and reinforce each other?

A

Constructive interference

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16
Q

What is the name of the phenomenon where two seismic waves overlap and cancel each other out?

A

Destructive interference

17
Q

Fill in the blank: The ________ is the location on the Earth’s surface directly above the earthquake’s focus.

A

Epicenter

18
Q

What is the term for the process of locating the epicenter of an earthquake?

A

Epicenter determination

19
Q

What is the term for the point on the Earth’s surface closest to the earthquake’s focus?

A

Hypocenter

20
Q

What is the name of the phenomenon where seismic waves change speed and direction as they travel through different materials?

A

Refraction

21
Q

What is the name of the phenomenon where seismic waves change speed and direction upon encountering a boundary between different materials?

A

Reflection

22
Q

Fill in the blank: The epicenter is located on the Earth’s surface directly ________ the earthquake’s focus.

A

Above

23
Q

What is the term for the record of seismic waves produced by an earthquake?

A

Seismogram

24
Q

What is the name of the region on the Earth’s surface where seismic waves are first detected?

A

Seismic shadow zone

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