Extended Seismic Source Characterisation using Linear Programming Inversion in ...

• Autor(es): Caldeira, B. ; Borges, J.F. ; Bezzeghoud, M. ; Bushenkov, V. ; Smirnov, G.
• Data: 2012
• Identificador Persistente: http://hdl.handle.net/10174/6943
• Origem: Repositório Científico da Universidade de Évora
• Assunto(s): Seismic source reconstitution; Numerical techniques; Joint seismic and geodetic data inversion
• Tipo de Documento: Artigo
• Idioma: Inglês
• Editor(es): Oliveira, C.S.

Descrição

A linear programming (LP) inversion method in a dual formulation was applied to reconstruct the kinematics of finite seismic ruptures. In a general setting, this approach can yield results from several data sets: strong ground motion, teleseismic waveforms or/and geodesic data (static deformation). The dual formulation involves the transformation of a normal solution space into an equivalent but reduced space: the dual space. The practical result of this transformation is a simpler inversion problem that is therefore faster to resolve, more stable and more robust. The developed algorithm includes a forward problem that calculates Green’s functions using a finite differences method with a 3D structure model. To evaluate the performance of this algorithm, we applied it to the reconstitution of a realistic slip distribution model from a data set synthesised using this model, i.e., the solution of the forward problem. Several other standard inversion approaches were applied to the same synthetic data for comparison.