This paper presents a new traveltime inversion method based on the wave equation. In this new method, designated as wave-equation traveltime inversion (WT), seismograms are computed by any full-wave forward modeling method (we use a finitedifference method). The velocity model is perturbed until the traveltimes from the synthetic seismograms are best fitted to the observed traveltimes in a leas...

The core-mantle boundary (CMB) is a complex and poorly understood region of the Earth. existence melt or partial at CMB strongly debated with evidence coming from range sources. While has been inferred in specific locations using seismology, often as an explanation for ultra-low velocity zones (ULVZs), no global layer observed despite that such should accumulate CMB. Using high frequency synthe...

A rock physics model was established to calculate the P-wave velocity dispersion and attenuation caused by squirt flow of fluids in gas hydrate-bearing sediments. The critical hydrate saturation parameter introduced describe different ways concentration, including mode pore filling co-existence particle cementation. Rock physical modeling results indicate that is insensitive increase for fillin...

An appropriate velocity model from well logs is a key issue in the processing and interpretation of seismic data. In deep borehole located central part Polish Outer Carpathians, sonic measurements were inadequate for purposes due to poor quality data gaps logging. Multiple regression (MR) modified Faust equation proposed log. MR estimated P-wave slowness as dependent variable on basis sets vari...

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...

Recently developed source inversion techniques do not take full advantage of the broadband nature of regional seismograms. The reason is that Green's functions generated from fiat-layered models are not correct for the complicated propagational phenomena associated with realistic crustal structure. The inversion is usually performed by removing short periods and inverting only selected portions...