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Occur When Rock Folds:
Earthquakes can also occur when rock folds that can no longer support the elastic strain break to form a fault.
Seismic (earthquake) waves spread outwards in all directions from the focus - much as sound waves do when a gun is fired [Key, 4]. There are two main types of seismic wave: the compressional wave and the shear wave [2]. Compressional waves cause the rock particles through which they pass to shake back and forth in the direction of the wave. Shear waves make the particles vibrate at right-angles to the direction of their passage. Neither type of seismic wave physically moves the particles: instead it merely travels through them.The French heading is probably the most satisfactory treatment, and consists in gathering the material in small folds about 6 inches apart and sewing the folds together usually 4 or 5 inches down from the top of the curtain; the folds then continue down the full length of the drapery, and are permanently fixed at a reasonably even spacing; the curtain is thus given a more tailored appearance. Box-plaiting consists of a similar spacing and start of folds, except that the head is not gathered, but doubled and pressed flat and sewed in that position. Plain shirring starts the folds at irregular intervals and is accomplished by sewing rings on the underside of the head of the curtain and sliding them on a small rod. Small weights evenly spaced along the bottom hem of curtains are some times used to make them hang properly, particularly if the material is unruly, as are glazed chintz and organdy.
Headings. Both valances and draperies may be given interest and, at the same time, organization and symmetry of folds by means of headings, plaiting, or shirring. The French heading is probably the most satisfactory treatment, and consists in gathering the material in small folds about 6 inches apart and sewing the folds together usually 4 or 5 inches down from the top of the curtain; the folds then continue down the full length of the drapery, and are permanently fixed at a reasonably even spacing; the curtain is thus given a more tailored appearance. Box-plaiting consists of a similar spacing and start of folds, except that the head is not gathered, but doubled and pressed flat and sewed in that position. Plain shirring starts the folds at irregular intervals and is accomplished by sewing rings on the underside of the head of the curtain and sliding them on a small rod. Small weights evenly spaced along the bottom hem of curtains are some-times used to make them hang properly, particularly if the material is unruly, as are glazed chintz and organdy.
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