EARTHSC 2GG3 Lecture Notes - Mercalli Intensity Scale, Richter Magnitude Scale, Convergent Boundary

• School: McMaster University
• Department: Earth Sciences
• Course: EARTHSC 2GG3
• Professor: Sergei Basik

Document Summary

Grenville (s. ontario) faults in this region are somewhat active and cause minor earthquakes. Most earthquakes (3 plates) coast of b. c. After affects can be worse than earthquakes itself (ex. Period the time between seismic waves. Wavelength the length from crest to crest of a wave. Frequency the number peaks per second. Tool to measure and record earthquake waves. After s wave when energy hits earth"s surface. Short-period seismographs: record local earthquakes (high freq) Long-period seismographs: record distant earthquake (low freq) Broadband seismographs: record both local and distant earthquakes; but cannot accurately measure strong earthquakes in the direct vicinity. Strong-motion seismographs: record local and very strong earthquakes. P waves (primary or compressional): wave shakes back and forth along the direction of wave travel. S waves (secondary or shear): shakes back and forth perpendicular to the direction of wave travel (cannot travel through a liquid) Love waves : move side to side. Lower wall will fall relative to upper wall.