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.
Rivas family history originated in Languedoc in southern France near the border with Spain, and Rivas genealogy includes the name variations Rhival, Rhivalle, Ribas, Ribes (Catalan), Rivale, Rivalls, Rivalles, and Rivel.he earliest American Rivas include Francisco de Rivas, who sailed to America in 1513, and Catalina de Rival who sailed to Colombia in 1585, with later settlers to Quebec in the mid-1600s.