Preparing for Earthquakes: Understanding Seismic Activity and Fault Lines, Slides of Geology

Download Preparing for Earthquakes: Understanding Seismic Activity and Fault Lines and more Slides Geology in PDF only on Docsity! Peter Yanev, Peace of Mind in Earthquake Country – How to Save Your Home and Life, Chronicle Books Seattle Fault Scenario (~6.5) Nisqually Subduction Zone Earthquake (6.8) NW Subduction Zone Earthquake, 1700; Indonesia, 2004 9+ Richter Magnitudes and Some Historic Earthquakes Docsity.com Peter Yanev, Peace of Mind in Earthquake Country – How to Save Your Home and Life, Chronicle Books Richter (Energy Based) and Modified Mercalli (Descriptive) Scales (for MM maximum damage) Richter – One number reflecting energy release Mercalli – Descriptive where intensity will be zoned about epicenter Docsity.com Earthquake Location http://web.ics.purdue.edu/~braile/edumod/as1lessons/EQlocation/EQlocation.htm Use knowledge of P-S velocities and difference of arrival times to calculate distance from seismic monitoring station (corrected for depth velocity variations) . Using multiple stations determine location. Docsity.com Samuel Y. Johnson, Christopher J. Potter, John J. Miller, John M. Armentrout, Carol Finn and Craig S. Weaver The southern Whidbey Island fault: An active structure in the Puget Lowland, Washington, Geological Society of America Bulletin 1996;108;334-354 Finding Faults – Seismic Reflection Docsity.com Focal Plane Solutions for Earthquakes • Very important for defining faults and stresses based on earthquakes of all detectable magnitudes • Map first motions and plot on maps and in 3-D • Stereonet“Beach Ball” Plots Docsity.com