18 Questions
What is the primary geological factor that can generate a tsunami?
Plate tectonic movement
Which characteristic of the seafloor slope is most important in determining tsunami wave height?
Depth
Which infrastructure is most vulnerable to damage from a tsunami?
Coastal buildings
What is the primary long-term consequence of tsunami flooding on the environment?
Soil salinization
What is the main role of the Pacific Tsunami Warning Center (PTWC)?
Both a and b
What is the primary cause of fatalities during a tsunami event?
Drowning
What geological factors contribute to the occurrence of earthquake-induced landslides?
Presence of weak, highly-sheared rocks of old fault zones
How do the characteristics of slope influence the location of earthquake-induced landslides?
Longer and steeper slopes are common sites
Why can earthquake-induced landslides lead to disruptions in lifelines?
They can cause major disruption to lifelines
What consequences can arise from the breach of landslide dams across streams?
Disastrous flooding and the triggering of more slides
What environmental effect do landslides have on river morphology?
Changes in river morphology due to sedimentation
Why are surfaces with signs of weakened slopes more prone to earthquake-induced landslides?
Weakness induced by old fault zones and landslide scars
What is the main reason for the complete relocation of some human populations and infrastructure to new areas?
Damage from both earthquakes and landslides
What is the fastest speed at which a tsunami can propagate?
The speed calculated using the formula $v = (gb)^{1/2}$
What happens to the speed of a tsunami wave as it approaches the shore?
The speed decreases due to the decreasing depth
What is the relationship between wave height and water depth as a tsunami approaches the shore?
Wave height increases inversely proportional to water depth
What is an important step for communities to take regarding slope instability?
Report any signs of slope instability to local authorities
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
Explore the factors that contribute to earthquake-induced landslides, including slope length, steepness, aspect, and geological properties. Learn how weakened slopes and low strength of rock or soil materials can lead to landslides during earthquakes.
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