EARTHSC 2GG3 Lecture Notes - Lecture 3: Foreshock, Silt, Himalayas

• School: McMaster University
• Department: Earth Sciences
• Course: EARTHSC 2GG3
• Professor: Mark Moscicki

Document Summary

They result from the rupture of rocks along a fault. Energy from an earthquake is released in the form of seismic waves. They are mapped according to the epicentre; the focus is located directly below the epicentre. The focus is below the ground the focus is where they happen. They are measured by seismographs and compared The magnitude of an earthquake is expressed as a number to one decimal place. This type of measurement was irst developed by richter in 1935. The richter scale was a measure of the strength of a wave at a distance of 100 km from the epicenter. Since then more accurate methods have been developed and the richter scale is no longer in use. Today earthquakes are measured using the moment magnitude scale. The scale is determined by: the area ruptured along a fault, the amount of movement along the fault, the elasicity (ex. hard and ridge) of the crust at the focus,