A new version of "Boxer" code for the determination of seismic source parameters from macroseismic data

Geophysical Research Abstracts, Vol. 11, EGU2009-5699, 2009 EGU General Assembly 2009 © Author(s) 2009 A new version of "Boxer" code for the determination of seismic source parameters from macroseismic data. P. Gasperini (1), G. Vannucci (2), and D. Tripone (3) (1) Dipartimento di Fisica, Università di Bologna, Viale Berti-Pichat 8, I-40127 Bologna (Italy), paolo.gasperini@unibo.it, (2) INGV-Istituto Nazionale di Geofisica e Vulcanologia, Via Donato Creti, 12, I-40128, Bologna (Italy), (vannucci@bo.ingv.it), (3) INGV-Istituto Nazionale di Geofisica e Vulcanologia, Via Donato Creti, 12, I-40128, Bologna (Italy), (tripone@bo.ingv.it) About ten years after the first release of the code we implemented new methods of epicentral location and magnitude computation as well as a procedure for the evaluation of uncertainties by the bootstrap technique. We also developed a user-friendly interface for parameter setup and graphical post-processing of the results. The improved code allows to locating epicenters in the sea or in uninhabited areas by minimizing the norm of the residuals of an attenuation equation. The same approach also per-mits, in the most favorable cases, the estimation of the source depth. By the geographical rendering of the bootstrap solutions we give a tool for characterizing the possible multiplicity of the seismic source of historical earthquakes