GEO 1111 Lecture Notes - Lecture 8: Continental Crust, African Plate, Red Sea

• School: University of Ottawa
• Department: Geology
• Course: GEO 1111
• Professor: Donald Cummings

Document Summary

Determining the distance to the epicenter- used from printout from seismometers. If you have a few you can find where the epicentre is. The distance is found by the time it takes for different wave types. (p-s interval. As you move away from the epicenter the ps spread increases) Richter scale determines with maximum amplitude on the printout. Velocity is dependent on the density (inverse proportion), to increase in velocity is due to the rigidity. (the more ridged, the faster the p wave travels) Gutenberg- associated with shadow zones of the s waves. Lehmann discontinuity between liquid outer core and solid inner core. Shadow zones from p waves are caused from refraction from the inner core. (due to difference in fluidity). There were late p waves in the p wave shadowzone, which suggests a solid portion in the middle. The late p waves are reflecting from the solid core.