%0 Book Section %1 bohlen_etal:2003 %A Bohlen, Thomas %A Müller, Christof %A Milkereit, Bernd %B Hardrock Seismic Exploration %C 8801 South Yale Suite 500 Tulsa OK 74137 USA %D 2003 %E Eaton, David W. %E Milkereit, Bernd %E Salisbury, Matthew H. %I Society of Exploration Geophysicists %K geophysics seismics %P 70--89 %R 10.1190/1.9781560802396.ch5 %T Elastic seismic wave scattering from massive sulfide orebodies: on the role of composition and shape %U http://dx.doi.org/10.1190/1.9781560802396.ch5 %V 10 %X We study the influence of composition and shape of massive sulfide ore deposits hosted in crystalline rocks on the full scattered wavefield through a series of numerical modelling experiments based on the 3-D elastic Finite Difference (FD) method. Ores consisting of the ned-member sulfide minerals pyrite, sphalerite and galena, which span the full range of observed velocities and densities in ore rocks, as well as gabbro inclusions are investigated for six different shapes which represent the complex morphologies often observed for ore deposits. 3-D FD modelling revealed that large ore deposits lead to a strong and complex scattering response which is dominated by shear wave events. Scattering from massive sulfides cannot be described accurately by the widely used Born approximation. The directional distribution of the scattered wavefield is mainly controlled by the shape of the ore. The directivity imposed by shape is a first-order characteristic of the scattered wavefield, whereas composition effects are of secondary importance. Amplitude focussing caused by the shape of the deposit may lead to very strong amplitude versus offset/azimuth trends. Therefore, the interpretation of amplitude versus offset/azimuth variations along scattering hyperbolas is highly ambiguous without detailed a priori knowledge of shape. If observed, they may serve as a diagnostic tool to classify the composition of the scattering object. %& 131E\_ch5 %@ 9781560801146

@incollection{bohlen_etal:2003, abstract = {We study the influence of composition and shape of massive sulfide ore deposits hosted in crystalline rocks on the full scattered wavefield through a series of numerical modelling experiments based on the 3-D elastic Finite Difference (FD) method. Ores consisting of the ned-member sulfide minerals pyrite, sphalerite and galena, which span the full range of observed velocities and densities in ore rocks, as well as gabbro inclusions are investigated for six different shapes which represent the complex morphologies often observed for ore deposits. 3-D FD modelling revealed that large ore deposits lead to a strong and complex scattering response which is dominated by shear wave events. Scattering from massive sulfides cannot be described accurately by the widely used Born approximation. The directional distribution of the scattered wavefield is mainly controlled by the shape of the ore. The directivity imposed by shape is a first-order characteristic of the scattered wavefield, whereas composition effects are of secondary importance. Amplitude focussing caused by the shape of the deposit may lead to very strong amplitude versus offset/azimuth trends. Therefore, the interpretation of amplitude versus offset/azimuth variations along scattering hyperbolas is highly ambiguous without detailed a priori knowledge of shape. If observed, they may serve as a diagnostic tool to classify the composition of the scattering object.}, added-at = {2012-09-01T13:08:21.000+0200}, address = {8801 South Yale Suite 500 Tulsa OK 74137 USA}, author = {Bohlen, Thomas and M\"{u}ller, Christof and Milkereit, Bernd}, biburl = {https://www.bibsonomy.org/bibtex/2ca76a4eb39643f60fbd4cd36a5c30e66/nilsma}, booktitle = {Hardrock Seismic Exploration}, chapter = {131E\_ch5}, day = 1, doi = {10.1190/1.9781560802396.ch5}, editor = {Eaton, David W. and Milkereit, Bernd and Salisbury, Matthew H.}, interhash = {19bde79acce7da346112d7db343e239c}, intrahash = {ca76a4eb39643f60fbd4cd36a5c30e66}, isbn = {9781560801146}, keywords = {geophysics seismics}, month = jan, pages = {70--89}, publisher = {Society of Exploration Geophysicists}, series = {Geophysical Developments Series}, timestamp = {2021-02-09T13:27:34.000+0100}, title = {Elastic seismic wave scattering from massive sulfide orebodies: on the role of composition and shape}, url = {http://dx.doi.org/10.1190/1.9781560802396.ch5}, volume = 10, year = 2003 }