S U M M A R Y We present an alternative to the classical mode coupling method scheme often used in global seismology to compute synthetic seismograms in laterally heterogeneous earth model and Frechet derivatives for tomographic inverse problem with the normal modes first-order Born approximation. We start from the first-order Born solution in the frequency domain and we use a numerical scheme ...

Historical seismograms contain a rich harvest of information useful for the study of past earthquakes. It is necessary to extract this information by digitising the analog records if modern analysis is required. Teseo has been developed for quick and accurate digitisation of seismogram traces from raster files, introducing a vectorisation step based on piecewise cubic Bézier curves. The vectori...

As a mean to assess the risk dam structures are exposed during earthquakes, we employ an abstract mathematical, three dimensional, elasto-acoustic coupled wave-propagation model taking into account (i) structure itself, embedded (ii) its surrounding topography, (iii) different material soil layers, (iv) seismic source as well (v) reservoir lake filled with water treated acoustic medium. case st...

The 2D seismic reflection data were used to study the structure of Shurau and Sheikh Alas formations (Oligocene) in Ismail area, northern Iraq. horizons reflectors identified based on well logs through a synthetic seismogram construction. Two-Way Time, velocity depth maps two coinciding obtained. A Great coincidence was noticed between identical formations. Main closure (syncline) trending NE-S...