Both body and surface waves are traveling waves; however, large earthquakes can also make the Earth ring like a bell. This ringing is a mixture of normal modes with discrete frequencies and periods of an hour or shorter. Motion caused by a large earthquake can be observed for up to a month after the event.
Carballo comes from the Portuguese word Carvalho, which means Oak. Therefore, this name means the place where the Oaks come from. In Portugal, Carvalho is also the name of a province in the district of Pe acova, within the Carvalho Mountains. In Spain, during the re-conquest years or the Reconquista, the name Carballo was extended from Galicia to the Iberian Peninsula and to the Canary Islands.
c.1300, body or host of knights; knighthood in the feudal social system; bravery in war, warfare as an art, from Old French chevalerie knighthood, chivalry, nobility, cavalry, art of war, from chevaler knight, from Medieval Latin caballarius horseman, from Latin caballus nag, pack-horse (see cavalier).