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Geography : Risk & Hazard Perception

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Jessy Frydenberg

on 8 February 2013

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Transcript of Geography : Risk & Hazard Perception

photo credit Nasa / Goddard Space Flight Center / Reto Stöckli - Armel - Lara - Vicky Earthquakes General Factors Affecting
Perception of Hazards + Poor Decision Making
+ Disability - Personal Circumstances Factors Affecting Individuals Perceptions of Hazard Risk + Preparation for the earthquake

+ Previous experience with earthquakes

+ Ability to exercise control over a hazard

+ Understanding and knowledge of earthquakes prior to these specific disasters

+ Use of technology [for preparation / prediction / building /etc] Methods & Obstacles Methods Used in Case Studies Sendai: How Prepared were the Affected
Communities? Predictions for both earthquakes had little effect on the community's readiness To Conclude
"Just for Fun" Decreases Perception: + Predictions of Hazards
+ Belief in Technology
+ First-hand Experience [with Hazard]
+ Belief in Technology
+ Overestimation / Underestimation
of Hazard Severity
+ Ability to Exercise Control
+ Use of Media (technology)
+ Knowledge & Understanding of a Hazard [in the case studies of Sendai and Loma Prieta] Both: + Preparation for Hazard Increases Perception: Earthquakes - Return / Interval period For Predicting Possible Ways of Forecasting Earthquakes: + Not realized until a few hours or even seconds before the hazard event - Development of warning systems - Erratic animal behaviour - Foreshocks - Changes in Vp/Vs --> the pressure waves passing through the rock at a certain velocity - Seismographs --> keep track of plate movement Jessy - Seismic electro signals (geoelectric) - Radon gas emission measurements Loma Prieta: In the days leading up the earthquake... - Little difference in radon emissions - Dogs at Santa Cruz County Animal shelter, rushed to their kennels whimpering seconds before - Monkeys at the SF zoo were screaming / banging on the glass an hour before - No foreshocks - Unnoticed minor changes in animal behavior - Seismographs measured small foreshocks - Scientists noticed high radon emissions (as they were not officially 'announced' to the communities) Sendai Loma Prieta - Prior experience = much smaller severity than it could have been - 63 deaths in total - About 31,000 deaths - Nowhere near as prepared as CA - About 15,000 buildings damaged (generally only minor damage) - No specific building damage data as the damage was largely severe) Earthquake - Labrinth
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