Banca de QUALIFICAÇÃO: CÍCERO COSTA DA SILVA

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE : CÍCERO COSTA DA SILVA
DATA : 24/12/2018
HORA: 08:00
LOCAL: Labsis
TÍTULO:

Ambient noise tomography in the Borborema Province with short-period stations

PALAVRAS-CHAVES:

Ambient noise tomography; Rayleigh-wave dispersion; Borborema Province

PÁGINAS: 60
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Geociências
RESUMO:

The analysis of seismic ambient noise has been recently proven a viable alternative to the analysis of seismic waves generated by earthquakes. Although seismic ambient noise had traditionally been discarded from earthquake records, it has now been shown that the cross-correlation of the seismic ambient noise allows for the recovery of the Green’s function between the receivers. Furthermore, seismic noise has the ability to propagate continuously and independently of the occurrence of earthquakes, allowing for high-resolution tomographic studies in regions of low seismicity. Over the last two decades, the cross-correlation of continuous seismic noise recordings between pairs of stations has been widely utilized in surface-wave tomography studies. For the Northeast Brazil region, tomographic studies have been exclusively performed with seismic data from broadband stations; however, in addition to those stations, there exists a large volume of short-period data that might potentially improve the resolution of existing ambient noise tomographies. Thus, goal of this master's thesis was to utilize, in addition to broadband data, short-period data recorded by the 22 stations (presently dismantled) that were deployed under the INCT-ET effort in the Borborema Province. Through cross-correlation and stacking of ambient seismic noise, the emergence of the Green’s function among all possible of stations was observed, along with the fundamental mode of the Rayleigh waves and their dispersive character. Once the empirical Green's functions were retrieved, the measurement of (phase and group) dispersion curves for periods up to 10 seconds and its tomographic inversion were assessed.

MEMBROS DA BANCA:
Interno - 1451214 - ADERSON FARIAS DO NASCIMENTO
Interno - 350640 - FRANCISCO HILARIO REGO BEZERRA
Presidente - 1863578 - JORDI JULIA CASAS