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.
The names of some famous persons by the name Norval (or its variants) are: Norval Crawford White, born on 12 June, a famous architect.Norval Crawford White 's background: An American architect, architectural historian and professor. Norval Baptie, born on 18 March, a famous athlete.orval Alexander Horner, born on 21 August, a famous politician. Norval Alexander Horner's background: A Saskatchewan politician and former member of the Canadian House of Commons.