Nodal-Plane Solution
Nodal-Plane Solution : Imagine a spherical surface around the earthquake source, then the pattern of constant P-wave polarity divides the spherical surface into four equal-sized quadrants. This pattern can be easily characterized by the two orthogonal "nodal" planes that separate the compressional and dilatational quadrants. These nodal planes are directly related to faulting geometry: one nodal plane coincides with the fault plane while the slip vector coincides with the pole of the other nodal plane (sometimes referred to as the auxiliary plane)
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