1 Inflammation of the gingiva, bone loss, and increased gingival recession may progress slower than with other forms of periodontitis.  Periodontitis Associated with Systemic Diseases - Systemic diseases, such as heart disease, diabetes, and certain forms of arthritis, may have a correlation with periodontitis.
Along Faults. Earthquakes can also occur far from the edges of plates, along faults. Faults are cracks in the earth where sections of a plate (or two plates) are moving in different directions. Faults are caused by all that bumping and sliding the plates do. They are more common near the edges of the plates.
Most earthquakes occur on plate boundaries for a variety of reasons. When plates in the earth's crust move, they scrape or bump each other on the edges and boundaries. Therefoâ¦re, the movements of the plates are more likely to be felt along the edges, where all of the activity takes place.