Fault-Plane Solution 2
Fault-Plane Solution 2 : A way of showing the fault and the direction of slip on it from an earthquake, using circles with two intersecting curves that look like beach balls. A fault-plane solution is found by an analysis using stereographic projection or its mathematical equivalent to determine the attitude of the causative fault and its direction of slip from the radiation pattern of seismic waves using earthquake records at many stations. The most common analysis uses the direction of first motion of P-wave onsets and yields two possible orientations for the fault rupture and the direction of seismic slip. Another technique is to use the polarization of teleseismic S waves and/or to measure amplitude ratios between different phase types. From these data, inferences can be made concerning the principal axes of stress in the region of the earthquake. The principal stress axes determined in this method are the compressional axis (also called the P-axis, i.e. the axis of greatest compression, or s1), the tensional axis (also known as the T-axis, i.e., the axis of least compression, or s3), and the intermediate axis (s2)
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