Banca de QUALIFICAÇÃO: MARIA RAYLA DOS SANTOS

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE : MARIA RAYLA DOS SANTOS
DATA : 30/05/2019
HORA: 14:00
LOCAL: Auditório CCET
TÍTULO:

DETERMINATION OF THE RELATIONSHIP BETWEEN OCEAN SURFACE WAVES AND SEISMIC NOISE IN THE EAST COAST OF THE NORTHEAST BRAZIL

PALAVRAS-CHAVES:

Microsseism; surface oceanic gravity waves; PNBOIA; coastal variability

PÁGINAS: 40
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Oceanografia
SUBÁREA: Oceanografia Física
ESPECIALIDADE: Interação do Oceano com a Atmosfera
RESUMO:

The study of ocean waves spread and dissipation is of extreme importance for the safety and efficiency to the offshore engineering works, as well as for the coastline management. However, there are difficulties associated with obtaining measured data at sea that make a good time-space sampling difficult to obtain. An alternative to filling these voids in the observations comes from the production of ocean waves data indirectly through the geophysical effect registered by means of the microseisms. The frequencies of the signals which are of interest of this proposition range from 10 – 20s (0.05 – 0.1Hz), and are denominated as primary microseism, and the variations between 3 – 10s (0.1 – 0.3Hz) are the secondary microseism. In this context, this research aims to evaluate the association of the oceanic gravity waves parameters and the microseismic signals recorded in the northeastern Brazilian coast. The oceanographic data come from the Recife buoy, which is the only one of the Programa Nacional de Boias (PNBOIA) located on the eastern part of the northeast Brazilian coast, from June 11 to November 16, 2015. The seismological data come from the NBRF station, installed in Rio Formoso – PE (closest station to the oceanic buoy). After pre-processing the seismograms, which includes limiting the analysis to the range of interest by applying a low-pass filter of 1 Hz, the obtained spectrograms will allow analyze the arrangement of spectral density from the signal and the relationship with events from ocean waves of expressive height (Swells). For those oceanic events, will also be investigated the atmospheric phenomena that generated it. This investigation will run through the analysis of the infrared channel from GOES 13 and Meteosat-10 satellites and data from reanalysis ERA5. One of our goals is to establish a correlation between the measured wave data and the microseismic records. To reach that, a transfer function will be estimated for converting the recorded information in the seismograph to surface oceanic gravity waves, correlating the significant wave height with the amplitude of the microsseism.

MEMBROS DA BANCA:
Presidente - 1164414 - WEBER ANDRADE GONCALVES
Interno - 1858120 - DAVID MENDES
Externo ao Programa - 1451214 - ADERSON FARIAS DO NASCIMENTO
Externo ao Programa - 2276514 - MARCIO MACHADO CINTRA