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Waveform modelling
Published in Rajib Biswas, Recent Developments in Using Seismic Waves as a Probe for Subsurface Investigations, 2023
where ut is the seismogram, st is the source term, gt is the propagation term, Itis the instrument response and ‘*’ represents the convolution operator. The comparison of synthetic seismogram with the observed earthquake record is known as waveform modelling. This is a tool used for understanding the source fault rupture process and earth structure through which the waves travel. It is an iterative process used to minimize the difference between the observed and synthetic seismograms either by adjusting the earth structure or the source parameters.
Surface Displacement in an Elastic Half Space Due to an Earthquake Source on an Inclined Fault Plane
Published in Arabinda Roy, Rasajit Kumar Bera, Linear and Non-Linear Deformations of Elastic Solids, 2019
Arabinda Roy, Rasajit Kumar Bera
Computation of a synthetic seismogram associated with an assumed seismic source is possibly the first step towards computation of a hazard map of the earthquake affected region. Essentially the steps involved include a suitable model of the earth which we will take as an elastic half space and a source which is assumed to trigger the earthquake. Traditionally Lamb’s source or a point source (Pekeris and Lifson, 1957) is used. Other models that are used are pressure on a circular area (Mitra, 1964, Roy, 1975, Tupholme, 1970). Moving source model (Gakenheimer and Miklowitz, 1969, Gakenheimer, 1971) has also been used. Roy (1974) used a point source moving along an inclined direction. Most studies on finite sources over a circular area are usually parallel to the free surface. However, sites of earthquakes are situated on a geologic fault, in general an inclined one. Recently De and Roy (2012) considered such model.
1-D basin modeling, 3-D reservoir mapping and source rock generative potential of Balkassar oilfield, Potwar basin, Pakistan
Published in Petroleum Science and Technology, 2023
Syed Bilawal Ali Shah, Syed Haider Ali Shah, Manabendra Nath
The vertical scale in seismic recording is two-way travel time. Seismic-well tying is a method used to identify the horizons on seismic sections to compare well data with seismic section. A synthetic seismogram is generated during this method (Figure 7). By combining the wavelet obtained from seismic data with the reflection acquired from density logs and digitalized acoustic logs, a synthetic seismogram is produced. The accuracy of the synthetic seismogram’s match with the recorded well logs depends on the accuracy of the seismic data.