A9R18EC.tmp 11 - Earthquake (15) Seismic waves Earthquake...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Earthquake (15) Seismic waves Earthquake (16) Recording EQ Seismograph : Principles Principles Description Description Vertical seismographe Vertical Horizontal seismograph (at less 2/ station) Horizontal Seismogramm Source: FEMA Source: A. Randrianasolo Earthquake (17) Vertical (on right) and horizontal (on left) seismograph Recording EQ Earthquake (18) Recording EQ Seismogram: is a graph output by a seismograph Source: A. Randrianasolo Source: A. Randrianasolo Earthquake (19) Evaluation There are two main methods or scales to evaluate the earthquake : Mercalli Scale (measures intensity of EQ; subjective) Richter Scale (measures magnitude of EQ). Earthquake (20) Evaluation? Relative Intensity Mercalli scale Mercalli Usable in inhabited region Usable Correlation: perception + damage / intensity Correlation: Magnitude Richter scale Richter Measure of energie released Measure M = log(A/T) + F(∆) log(A/T) Today, only Richter method is used. However, the EQs that occurred in the past can only be evaluated using Mercalli’s method. Source P. A. Bourque, 2004 Prof. M. Fall - University of Ottawa 11 ...
View Full Document

This note was uploaded on 03/21/2011 for the course GNG 4124 taught by Professor Soils during the Spring '11 term at Uni. of Nottingham Ningbo.

Ask a homework question - tutors are online