Banca de QUALIFICAÇÃO: JOSÉ RICHARLES ALMEIDA GOMES

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : JOSÉ RICHARLES ALMEIDA GOMES
DATE: 02/12/2019
TIME: 10:00
LOCAL: Auditório LABSIS
TITLE:

Monitoring velocity changes using seismic interferometry after earthquakes occur in the Saint Peter Saint Paul Archipelago, Equatorial Atlantic

KEY WORDS:

Seismic Noise Interferometry; Moving Window Cross Spectral; Velocity Changes; Seismicity; Saint Peter Saint Paul Archipelago

PAGES: 30
BIG AREA: Ciências Exatas e da Terra
AREA: Geociências
SUMMARY:

Monitoring velocity changes associated with volcanism or seismicity provides insights into how internal dynamic processes can affect the Earth's surface. In this qualification report we present the preliminary results of the investigation of velocity structure disturbances in the Saint Peter Saint Paul Archipelago (ASPSP) due to seismicity. Through seismic noise recorded throughout 2012 by the seismographic station installed at ASPSP, local earthquakes were monitored with two distinct approaches. In the first one, we analyzed the decorrelation over the period under analysis, in which it was possible to identify significant falls in the correlation coefficients after the nearest events with moderate magnitudes. In addition, velocity variations were estimated using the Moving Window Cross Spectral (MWCS) methodology. Periods of 0.02 % increase in seismic velocity were identified that coincided temporally with the largest falls in the correlation coefficient. It is still necessary to aggregate complementary information to help plot a physical model that explains why velocity increase.

BANKING MEMBERS:
Presidente - 1451214 - ADERSON FARIAS DO NASCIMENTO
Interno - 583.103.478-04 - JOAQUIM MENDES FERREIRA - UFRN
Externo à Instituição - RENATO RAMOS DA SILVA DANTAS