HR: 0800h
AN: S51A-08    [Abstracts]
TI: Seismic activity in northeastern Brazill-new perspectives
AU: * Ferreira, J M
EM: joaquim@dfte.ufrn.br
AF: U. Federal do Rio Grande do Norte, U. Federal do Rio Grande do Norte Departamento de Fisica, Natal, RN , Brazil
AU: do Nascimento, A F
EM: aderson@dfte.ufrn.br
AF: U. Federal do Rio Grande do Norte, U. Federal do Rio Grande do Norte Departamento de Fisica, Natal, RN , Brazil
AU: Vilar, C S
EM: vilar@dfte.ufrn.br
AF: U. Federal do Rio Grande do Norte, U. Federal do Rio Grande do Norte Departamento de Fisica, Natal, RN , Brazil
AU: Bezerra, F H
EM: bezerrafh@geologia.ufrn.br
AF: U. Federal do Rio Grande do Norte, U. Federal do Rio Grande do Norte Departamento de Geologia, Natal, RN , Brazil
AU: Assumpcao, M
EM: marcelo@iag.usp.br
AF: U. de Sao Paulo, Universidade de Sao Paulo Instituto Astronomica e Geofisico, Sao Paulo, SP , Brazil
AU: Berrocal, J
EM: berrocal@iag.usp.br
AF: U. de Sao Paulo, Universidade de Sao Paulo Instituto Astronomica e Geofisico, Sao Paulo, SP , Brazil
AU: Fuck, R A
EM: reinhardt@unb.br
AF: U. de Brasilia, U. de Brasilia Instituto de Geociencias, Brasilia, DF , Brazil
AB: Northeastern Brazil is the most seismic active region in the country. Some earthquakes with magnitude above 5.0 and intensity VII MM associated with swam-like seismic activity lasting for many years are a serious social concern. Since the 1980's macroseismic and instrumental surveys have been carried out in this region and they are an important data archive which allows the composition of a reliable catalogue of seismic activity for this region. Among the many scientific results it was possible to identify the main seismogenic areas, obtain reliable hypocentres and focal mechanisms. As a consequence, it was possible also to analyse the relationship between seismicity and geological features. It was also possible to determined maximum horizontal stress direction for the region. An important induced seismic activity case has also been reported in the area as being a classical example of pore pressure diffusion triggering mechanism. The majority of the results were obtained using analogic data. Recently, a new research project is being conducted and will allow us to provide a regional scale monitoring with 6 broad-band stations and a new portable six station digital seismic network equipped with short- period sensors. Thus, with the continuous seismic activity in the area we trust that the results of this project will increase the present knowledge of seismic activity in northeastern Brazil.
UR: http:www.dfte.ufrn.br
DE: 7200 SEISMOLOGY
DE: 7221 Paleoseismology (8036)
DE: 7230 Seismicity and tectonics (1207, 1217, 1240, 1242)
DE: 7294 Seismic instruments and networks (0935, 3025)
DE: 7299 General or miscellaneous
SC: Seismology [S]
MN: 2007 Joint Assembly