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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Earthquake source properties of a shallow induced seismic sequence in SE Brazil

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Agurto-Detzel, Hans ; Bianchi, Marcelo ; Prieto, German A. ; Assumpcao, Marcelo
Número total de Autores: 4
Tipo de documento: Artigo Científico
Fonte: JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH; v. 122, n. 4, p. 2784-2797, APR 2017.
Citações Web of Science: 2

We study source parameters of a cluster of 21 very shallow (< 1 km depth) small-magnitude (M-w< 2) earthquakes induced by percolation of water by gravity in SE Brazil. Using a multiple empirical Green's functions (meGf) approach, we estimate seismic moments, corner frequencies, and static stress drops of these events by inversion of their spectral ratios. For the studied magnitude range (-0.3< M-w< 1.9), we found an increase of stress drop with seismic moment. We assess associated uncertainties by considering different signal time windows and by performing a jackknife resampling of the spectral ratios. We also calculate seismic moments by full waveform inversion to independently validate our moments from spectral analysis. We propose repeated rupture on a fault patch at shallow depth, following continuous inflow of water, as the cause for the observed low absolute stress drop values (< 1 MPa) and earthquake size dependency. To our knowledge, no other study on earthquake source properties of shallow events induced by water injection with no added pressure is available in the literature. Our study suggests that source parameter characterization may provide additional information of induced seismicity by hydraulic stimulation. (AU)

Processo FAPESP: 14/26330-0 - Caracterização da fonte de sismicidade induzida em bebedouro, Brasil, e de terremotos profundos na América do Sul
Beneficiário:Hans Alex Agurto Detzel
Linha de fomento: Bolsas no Exterior - Estágio de Pesquisa - Pós-Doutorado
Processo FAPESP: 14/09455-3 - Sismos induzidos em Bebedouro, SE Brasil: sismicidade, estrutura de velocidade e mecanismos focais
Beneficiário:Hans Alex Agurto Detzel
Linha de fomento: Bolsas no Brasil - Pós-Doutorado