Earthquake-induced Landslides: Causes and Factors

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What is the primary geological factor that can generate a tsunami?

Coastal landslide

Volcanic eruption

Meteorite impact

Plate tectonic movement (correct)

Which characteristic of the seafloor slope is most important in determining tsunami wave height?

Depth (correct)

Sediment composition

Roughness

Steepness

Which infrastructure is most vulnerable to damage from a tsunami?

Skyscrapers

Coastal buildings (correct)

Bridges

Power lines

What is the primary long-term consequence of tsunami flooding on the environment?

Soil salinization Signup and view all the answers

What is the main role of the Pacific Tsunami Warning Center (PTWC)?

Both a and b Signup and view all the answers

What is the primary cause of fatalities during a tsunami event?

Drowning Signup and view all the answers

What geological factors contribute to the occurrence of earthquake-induced landslides?

Presence of weak, highly-sheared rocks of old fault zones Signup and view all the answers

How do the characteristics of slope influence the location of earthquake-induced landslides?

Longer and steeper slopes are common sites Signup and view all the answers

Why can earthquake-induced landslides lead to disruptions in lifelines?

They can cause major disruption to lifelines Signup and view all the answers

What consequences can arise from the breach of landslide dams across streams?

Disastrous flooding and the triggering of more slides Signup and view all the answers

What environmental effect do landslides have on river morphology?

Changes in river morphology due to sedimentation Signup and view all the answers

Why are surfaces with signs of weakened slopes more prone to earthquake-induced landslides?

Weakness induced by old fault zones and landslide scars Signup and view all the answers

What is the main reason for the complete relocation of some human populations and infrastructure to new areas?

Damage from both earthquakes and landslides Signup and view all the answers

What is the fastest speed at which a tsunami can propagate?

The speed calculated using the formula $v = (gb)^{1/2}$ Signup and view all the answers

What happens to the speed of a tsunami wave as it approaches the shore?

The speed decreases due to the decreasing depth Signup and view all the answers

What is the relationship between wave height and water depth as a tsunami approaches the shore?

Wave height increases inversely proportional to water depth Signup and view all the answers

What is an important step for communities to take regarding slope instability?

Report any signs of slope instability to local authorities Signup and view all the answers

What should communities prepare for in the event of future landslides?

Provisions for food, water, blankets, medicines, and other supplies needed for possible prolonged isolation due to destruction of roads Signup and view all the answers

Earthquake-induced Landslides: Causes and Factors

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