beachballs

By c onvention the c ompres s ional quadrants are c

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: o thes e planes . By c onvention the c ompres s ional quadrants are c olour-filled and the tens ional left white. The two nodal planes inters ec t at the N (neutral)ax is . The P and T ax es are als o often plotted; with the N ax is thes e three direc tions res pec tively matc h the direc tions of the max imum, minimum and intermediate princ iple c ompres s ive s tres s es as s oc iated with the earthquak e. The P-ax is is plotted in the c entre of the white s egment, the T-ax is in the c entre of the c olour-filled s egment. The fault plane res pons ible for the earthquak e will be parallel to one of the nodal planes , the en.wikipedia.or g /wiki/Focal_mechanism 2/3 12/8/13 Focal mechanism - Wikipedia, the fr ee encyclopedia other being c alled the aux iliary plane. Unfortunately it is not pos s ible to determine s olely from a foc al mec hanis m whic h of the nodal planes is in fac t the fault plane. For this other geologic al or geophy s ic al evidenc e is needed to remove the ambiguity . The s lip vec tor, whic h is the direc tion of motion of one s ide of the fault relative to the other, lies within the fault plane, 90 deg from...
View Full Document

This document was uploaded on 02/04/2014.

Ask a homework question - tutors are online