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Previous issue date: 2014-06-27 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES / Microssismos s?o vibra??es cont?nuas na Terra registradas na faixa de
frequ?ncia de mili Hertz para 1 Hz. Estas vibra??es s?o em sua maioria
compostas de ondas Rayleigh e s?o mais fortes na faixa de frequ?ncia de 0.04
? 1 Hz. Seus mecanismos de gera??es ainda s?o quest?es de debates, mas ?
consenso que eles est?o relacionados com perturba??es atmosf?ricas e ondas
oce?nicas de gravidade. O Arquip?lago de S?o Pedro e S?o Paulo (ASPSP)
est? localizado na regi?o equatorial do Oceano Atl?ntico cerca de 1.100 km de
dist?ncia da costa do nordeste brasileiro. O ASPSP ? composto por um
conjunto de v?rias pequenas forma??es rochosas com uma ?rea total de
aproximadamente 17.000 m?. Devido a sua localiza??o distante do continente,
isolamento e aus?ncia de ru?dos provocados pela atividade humana, este local
? ideal para a medi??o de ru?do micross?smico e investiga??o de sua rela??o
com algumas vari?veis clim?ticas e oceanogr?ficas. No ASPSP registramos
microssismos prim?rios (PM) entre 0.04 - 0.12 Hz e microssismos secund?rios
(SM) entre 0.12 - 0.4 Hz durante 10 meses em 2012 e 2013. As an?lises
indicam uma boa correla??o entre o ru?do micross?smico na regi?o e uma
depend?ncia do clima de ondas. Em particular, com inverno no hemisf?rio
norte. Tamb?m ? mostrado que a maior parte do PM ? gerado no pr?prio
ASPSP. O local de gera??o do SM depende do comportamento das vari?veis
clim?ticas e oceanogr?ficas no hemisf?rio norte. / Microseisms are continuous vibrations pervasively recorded in the mili Hertz to
1 Hz frequency range. These vibrations are mostly composed of Rayleigh
waves and are strongest in the 0.04 to 1 Hz frequency band. Their precise
source mechanisms are still a matter of debate but it is agreed that they are
related to atmospheric perturbations and ocean gravity waves. The Saint Peter
Saint Paul Archipelago (SPSPA) is located in the equatorial region of the
Atlantic Ocean about 1,100 km distant from the Brazilian northeastern coast.
The SPSPA is composed by a set of several small rocky formations with a total
area of approximately 17,000 m?. Due to its remote distance from the continent
and the lack of cultural noise, this location is a unique location for measuring
microseismic noise and to investigate its relation with some climate and
oceanographic variables. In the SPSPA we have recorded both primary
microseisms (PM) at 0.04 ? 0.12 Hz and the secondary microseisms (SM) at
0.12 ? 0.4 Hz during 10 months in 2012 and 2013. Our analysis indicates a
good correlation between the microseismic noise in the region and a seasonal
dependency. In particular, the winter in the northern hemisphere. We have also
shown that most of the PM is generated in the SPSPA itself. The SM source
location depends with the seasonal climatic and oceanographic variables in the
northern hemisphere
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/19604 |
| Date | 27 June 2014 |
| Creators | Queiroz, Daniel ?vora de |
| Contributors | 90376285400, http://lattes.cnpq.br/8600906973888297, Chaves, Rosane Rodrigues, 41495942520, http://lattes.cnpq.br/3172179226768630, Assump??o, Marcelo Sousa de, 80543855872, http://lattes.cnpq.br/2833240474723324, Nascimento, Aderson Farias do |
| Publisher | Universidade Federal do Rio Grande do Norte, PROGRAMA DE P?S-GRADUA??O EM GEODIN?MICA E GEOF?SICA, UFRN, Brasil |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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