seismic hazards Flashcards

1
Q

plates dont move in…

A

fluid motiosn

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2
Q

why do plates become stuck (at any boundary)?

A

friction between plates

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3
Q

when pressure builds up what eventually happens?

A

give way and pressure is released quickly creating jolting movement

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4
Q

what is the jolt responsible for?

A

seismic movement spreading throughout the ground

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5
Q

what is the focus?

A

the point underground where the earthquake originates from

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6
Q

what is the spatial distribution?

A

along all boundaries

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7
Q

what is seismicity?

A

to measure the strength of seismic waves

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8
Q

what is seismicity measured with?

A

the logarithmic richter scale

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9
Q

what does the mescali scale look at?

A

rate of the destruction caused

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10
Q

are earthquakes frequent?

A

yes

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11
Q

what is most frequent?

A

smaller magnitude earthquakes

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12
Q

do earthquakes follow any pattern?

A

no - they are random

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13
Q

can u predict earthquakes?

A

almost impossible - microquakes may give some indication but the magnitude cannot be predicted as how strong they are as they r random

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14
Q

what are some siesmic events?

A

shockwaves, tsunamis, liquefaction and landslides and avalanches

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15
Q

what are shockwaves?

A

energy released from the sudden jolt that vibrates through the ground

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16
Q

how are tsunami caused?

A

when water is displaced from plates moving underwater - create a large wave

17
Q

what is liquifaction?

A

when soil is saturated - vibrations of an earthquake causes it to act like a liquid - soil become weaker and more likely to subside - large weight on It