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Earthquakes

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Glen Fahey

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Cards in this guide (16)
At divergent plate boundaries in the ocean magma rises and melts because of what

Because of a decrease in pressure.

A tsunami can occur when there is vertical movement at a fault under

The ocean floor.

What process occurs when an earthquake's shaking turns loose soil into mud

the answer is liquefaction

How much of an increase in wave amplitude is seen from an earthquake measuring 5.4 on the Richter scale compared to one measuring 4.4

Ten times

Use the words sea floor spreading and mid ocean ridges in a complete sentence

Mid ocean ridges are the direct result of sea floor spreading.

Which is a landscape feature created by glacial deposits

outwash plain

What did the pattern of earthquakes in the wadati-benioff seafloor zones show scientists

Slabs of ocean floor return to the mantle in subduction zones

What did wegener hypothesis happened to the continents

Continental Drift.

Which was not included in the support for harry hess's hypothesis of sea-floor spreading

Granitic strips in the ocean floor ...

Novanet

What is the difference of the P waves and S waves used to locate an earthquake's epicenter

P waves, also called primary waves, are the first waves to be registered on a seismograph. The S waves, or secondary waves, are the second and slower wave to register on the seismograph. When locating an earthquakes epicenter seismologists take the first reading of the P wave, and then take the reading from the S wave. At the station of where the earthquake was recorded, seismologists draw a large circle from where the earthquakes epicenter could be. TO exactly located the earthquakes epicenter there needs to be at least 3 dfferent staions where the earthquake hit to determine its epicenter using the S and P time interval. 

Why was Alfred wegeners idea that tidal forces might cause continental drift refuted as impossible

It would stop earth's rotation.

Showed that the tidal forces needed to move continents would stop earths rotation.

When p wave bend while traveling through earth's core what happen when arrive at the shadow zone

serveral minutes later than expected

When new rock is added to an oceanic ridge the magnetized strips on either side of the ridge are evidence of sea-floor spreading. This is because the rocks on the two sides of the ridge

are equal in width and polarity

What was the reason wegeners continental drift hypothesis was rejected

His evidence was incorrect.

The trace that records an earthquake from seismic instruments is called a

magnitude

How do ancient glacial deposits in Africa India Australia and South America support the idea of continental drift

G

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