Plot the following focal mechanisms on a stereonet by using
the
relations in Section 4.2.5 to find the second nodal plane.
Indicate
the compressional and dilatational quadrants, mark the P and
T
axes, and describe the type of faulting. Use the conventions
of
Fig. 4.2-2, and remember that dip is defined from the −x2
axis
and is less than 90°.
(a) 0 = 330°, 1 = 65°, * = 70°
(b) 0 = 280°, 1 = 60°, * = 270°
- Plot The Following Focal Mechanisms On A Stereonet By Using The Relations In Section 4 2 5 To Find The Second Nodal Plan 1 (149.84 KiB) Viewed 22 times
Dip angle S X3 2 â Slip angle X2 of X1 www. AMEW Strike angle www www. 2221277714 www wwwww wwwwwwwwwwww Amminis Wwwww wwwww show n.d = 0 232330 MATEUNENLLZW Fault plane Fig. 4.2-2 Fault geometry used in earthquake studies. The fault plane, with normal vector în, separates the lower, or foot wall, block from the upper hanging wall block (not shown). The slip vector, d, describes the motion of the hanging wall block with respect to the foot wall block. The coordinate axes are chosen with x3 vertical and x₁ oriented along the fault in the plane of the earth's surface, such that the fault dip angle, 8, measured from the −x₂ axis, is less than 90°. The slip angle λ is measured between the x₁ axis and d in the fault plane. Of is the strike of the fault measured clockwise from north. (After Kanamori and Cipar, 1974. Phys. Earth Planet. Inter., 9, 128–36, with permission from Elsevier Science.) 11111111 Foot wall block North