A: P waves, or compressional waves, are seismic body waves that. shake the ground back and forth in the direction that the wave. is moving. P waves travel fastest and are generally felt first. They. usually cause very little damage. B: S, or secondary waves or shear waves, are seismic body waves that. shake the ground back and forth perpendicular to the direction. the wave is moving. C: Surface waves (not shown in the house images) roll the ground in a. back-and-forth, up- and-down motion.
A scientific method or process is considered fundamental to the scientific investigation and acquisition of new knowledge based upon verifiable evidence. In addition to employing the scientific method in their research, sociologists explore the social world with several different purposes in mind.
Sampling for qualitative research 525 qualitative studies and why alternative strategies areused. Three broad categories of naturalistic samplingtechniques have been describedâconvenience, judge-ment and theoretical samplingâthough in practice thereis often considerable overlap between these approaches.