GEOL 106 - LEC 16

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Queen's University
Geological Sciences and Geological Engineering
GEOL 106

Readings from textbook. Chapter 2 Earthquakes. Scenario • The government of Ontario proposes to build a nuclear reactor on the shore of lake Ontario near Kingston. • Our task: carry out a RISK ANALYSIS and RISK MANAGEMENT study, for the government , focused on SEISMIC RISK. San Andres Fault in San Fransisco Elastic Rebound Theory • Rigid part of Earth can store Elastic Energy • (Hockey Stick) Applying stress then eventually breaking or returning to original shape a) original position b) buildup of strain c) slippage d) strain released Therefore earthquakes are associated with faults • Earthquakes happen when either o A fault forms o There is an episode of Movement on a pre-existing fault  In both cases, stored energy is released! For a big earthquake fault motion needs to be only a metre or so Fault Terminology • 1. Strike-Slip : Horizontal motion, not up and down , only side to side (Stress is horizontal , flat) o The San Andreas Fault • 2. Dip-Slip : Generates a Fault Scarp o Two Types
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