GEOL 1001 Chapter : GEOL 1001 Chapter 11
Document Summary
It"s the crust along the fault line adjusting to the displacement: foreshocks: sometimes precedes and can predict major earthquakes. 11. 3 seismology: the study of earthquake waves: instruments used to record, seismographs/seismometers: weight freely suspended from a support that is attached to bed rock. When vibrations reach it the inertia of the weight keeps the instrument stationary, while earth and the support move. The weight provides a reference point to measure the amount of displacement: seismograms: the records obtained from seismographs. Measures waves: body waves: travels through earth"s interior, primary (p) waves: push and pull rocks in the direction they"re traveling. Change the volume of what they"re going through: secondary (s) waves: shake particles at the right angle to their travels. Change the shape of what they"re going through: surface waves: travel in the rock layers just below earth"s surface, one causes earth"s surface and anything on it to move, other causes earth"s materials to move side to side.
