Explore the fundamentals of seismology and Earth's internal structure in this 43-minute lecture. Delve into topics such as elastic rebound theory, megathrust faults, and the propagation of earthquake waves. Learn how to locate earthquakes, differentiate between body and surface waves, and understand methods for determining earthquake magnitude and intensity. Examine the destructive potential of earthquakes, including liquefaction and tsunamis, and investigate current approaches to earthquake prediction. Gain insights into Earth's interior layers through the study of seismic wave behavior, and discover how this knowledge contributes to our understanding of our planet's composition. Utilize resources from the USGS Earthquake Hazards Program and NOAA Tsunami Program to enhance your comprehension of these critical geological phenomena.
Overview
Syllabus
Intro
Elastic Rebound
Megathrust Fault
Seismology: The Study of Earthquake Waves • Earthquake waves - Study of earthquake waves is called seismology - Earthquake recording instrument (seismograph)
Earthquake Focus and Epicenter
Earthquakes • Locating an earthquake
Body Wave and Surface Wave Travel
Determining the Size of Earthquakes • Intensity - A measure of the degree of earthquake shaking at a given locale based on the amount of damage - Most often measured by the Modified Mercalli Intensity
Seismic Intensity Map, Loma Prieta 1989
Determining Richter Scale Magnitude
Annual Earthquake Occurrence
Earthquake Destruction
Liquefaction
Japan Tsunami
Formation of a Tsunami
Tsunami Travel Times to Honolulu
Earthquake Prediction
Earth's Interior . Most of our knowledge of Earth's interior comes from the study of P and Searthquake waves - Travel times of P and S waves through Earth vary depending on the properties of the materials
Possible Paths of Earthquake Waves
Earth's Layers
Views of Earth's Layered Structure
Taught by
Sven Holbik
