Topic 2, Chapter 2.3 Part 1:

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Questions and Answers

Which of the following is NOT a typical consequence of ground shaking during an earthquake?

  • Weakening of buildings and bridges.
  • Increased agricultural productivity due to soil aeration. (correct)
  • Disruption of communication networks.
  • Fracturing of trees and damage to wildlife habitats.

The rupture of oil and chemical factories during ground shaking primarily leads to air pollution.

False (B)

Name two types of infrastructure that are typically weakened by ground shaking.

Buildings and Bridges

During the 2010 Port-au-Prince earthquake, the rupture of water pipes led to a significant __________.

<p>water shortage</p> Signup and view all the answers

An earthquake causes widespread damage to infrastructure, including rupturing gas lines, collapsing buildings, and snapping powerlines. In addition to the direct physical destruction and immediate safety hazards, what is the most likely cascading effect that would critically impede rescue efforts and prolong the crisis in the immediate aftermath?

<p>A complete failure of communication networks preventing coordinated emergency response. (C)</p> Signup and view all the answers

What is the primary cause of a tsunami?

<p>Undersea earthquakes (C)</p> Signup and view all the answers

Besides direct flooding, which of the following is a significant way tsunamis damage coastal ecosystems?

<p>Polluting habitats with debris carried by the waves (B)</p> Signup and view all the answers

How do tsunamis most significantly disrupt essential services in affected areas?

<p>By damaging infrastructure, collapsing buildings, and severing power and communication lines (B)</p> Signup and view all the answers

In addition to drowning, what is another major cause of injuries and death during a tsunami?

<p>Being struck by debris carried by the waves (A)</p> Signup and view all the answers

What was a key characteristic of the 2011 Tohoku, Japan tsunami that contributed to extensive damage?

<p>The extreme height of the waves (D)</p> Signup and view all the answers

Which type of plate boundary is MOST commonly associated with major earthquake zones?

<p>Convergent boundaries (B)</p> Signup and view all the answers

Intraplate earthquakes are more frequent and pose a greater overall global threat than earthquakes at plate boundaries.

<p>False (B)</p> Signup and view all the answers

What geological feature is MOST often associated with intraplate volcanism?

<p>hotspots</p> Signup and view all the answers

Subduction zone earthquakes are a significant trigger for ________.

<p>tsunamis</p> Signup and view all the answers

Match the plate boundary type with its associated tectonic hazard:

<p>Convergent Boundary = Earthquakes, Volcanoes, Tsunamis Divergent Boundary = Volcanoes (typically less explosive) Transform Boundary = Earthquakes</p> Signup and view all the answers

Which of the following factors DOES NOT influence the intensity of ground shaking during an earthquake?

<p>Atmospheric pressure at the epicenter (D)</p> Signup and view all the answers

The recurrence interval of past seismic events, combined with historical seismicity, contributes MOST significantly to what type of assessment?

<p>Seismic hazard assessment (B)</p> Signup and view all the answers

Explain the relationship between plate boundaries and the distribution of both earthquakes and volcanoes. Include specific examples of plate boundary types and their associated hazards.

<p>Earthquakes and volcanoes are closely associated with plate boundaries. Convergent boundaries (e.g., subduction zones) are characterized by both earthquakes and explosive volcanoes due to one plate sliding beneath another, causing melting and generating magma. Transform boundaries (e.g., the San Andreas Fault) primarily produce earthquakes due to the horizontal sliding motion of plates. Divergent boundaries (e.g., mid-ocean ridges) feature volcanic activity as magma rises to fill the gap created by separating plates.</p> Signup and view all the answers

Flashcards

Ecosystem destruction

Ground shaking can destroy ecosystems by rupturing factories and damaging habitats.

Property damage

Buildings, bridges, and roads can weaken or collapse, complicating rescue efforts after an earthquake.

Service disruption

Earthquakes can snap water and gas pipes, halting essential services and causing shortages.

Injuries and fatalities

People trapped in collapsed buildings during earthquakes can suffer injuries or death.

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2010 Haiti earthquake

A devastating Mw7.0 earthquake that caused pollution, building destruction, and numerous casualties in Haiti.

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Tsunami

A series of ocean waves caused by undersea earthquakes that travel long distances.

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Ecosystem damage

Flooding from tsunamis destroys wetlands, forests, and habitats, harming wildlife.

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Infrastructure destruction

Tsunamis can sweep away buildings and roads, causing significant damage to infrastructure.

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2011 Tohoku Tsunami

A massive tsunami triggered by a Mw 7.0 earthquake in Japan, causing widespread destruction and loss of life.

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Earthquake distribution

Earthquakes cluster along specific geological features, often at plate boundaries.

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Subduction zones

Areas where one tectonic plate slides under another, high-risk for earthquakes.

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Intraplate earthquakes

Earthquakes that occur within tectonic plates, less frequent but dangerous.

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Volcano distribution

Volcanoes are primarily located along plate boundaries, especially convergent ones.

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Divergent plate boundaries

Areas where tectonic plates separate, often leading to volcanic activity.

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Tsunami triggers

Tsunamis are often triggered by undersea earthquakes from subduction zones.

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Ground shaking factors

Ground shaking varies based on the focus depth and distance from the epicenter.

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Seismic hazard assessment

Evaluates earthquake risk based on historical data and geological features.

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Study Notes

Ground Shaking Effects

  • Ecosystem Destruction: Earthquakes rupture oil and chemical factories, polluting land and water. They also fracture and uproot trees, causing widespread tree injury, death, and damage to wildlife habitats.

Property Damage

  • Structural Damage: Earthquakes weaken buildings, bridges, roads, and railways, leading to their collapse. This makes rescue efforts difficult and disrupts the supply of emergency aid.

Service Disruptions

  • Utility Failures: Earthquakes snap water and gas pipes, causing water shortages and disrupting gas supplies. Electricity and communication systems are also often disrupted, hindering tsunami warnings and TV broadcasts.

Injuries and Deaths

  • Trapped People: Earthquakes trap people in collapsed buildings, resulting in injuries and deaths.
  • Example: The 2010 Haiti earthquake (Mw 7.0) in Port-au-Prince caused significant pollution to surrounding areas of factories and debris-polluted rivers. More than 250,000 homes were destroyed, and over 220,000 people died. The earthquake also ruptured water pipes leading to water shortages.

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