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.
Main Content. An earthquake is ground shaking caused by a sudden movement of rock in the earthâs crust. Such movements occur along faults, which are thin zones of crushed rock separating blocks of crust.
Earthquakes usually occur where two plates are running into each other or sliding past each other. Earthquakes mostly occur in places where there is a Fault Line. Plates under the Earth's surface move and push against each other. Some of these places are: Alaska is the most earthquake-prone state and one of the most seismically active regions in the world.