GEOL 2207 Lecture Notes - Slinky, Compressive Stress
Document Summary
Geologic structure along which displacement has occurred. Motion on all types of faults causes earthquakes (active faults) Some faults (e. g. , blind thrusts) have no surface expression. Includes two walls on an incline defined by miners as: Foot wall, where miners put their feet. Hanging walls, where they put their lanterns. Faults defined by the relative motion of footwall and hanging wall. Normal faults: hanging wall moves down; divergence; tension stress. Reverse fault: hanging wall moves up; convergence; compressive stress. Dextral (right-lateral: position yourself on the plates and see where the plate moves. Active faults movement during the past 11,600 years. Potentially active faults movement during the past 2. 6 million years. Inactive faults no movement during the past 2. 6 million years. Tectonic creep occurs when movement is so gradual that earthquakes are not felt. P wave (primary) ~6km/s, compressional: longitudinal (slinky) (moving left and right, can go through liquids.
