Observations and modelling of rotational signals in the P-Coda: constraints on crustal scattering
- Abstract
In addition to three classical components (vertical, N-S, and E-W) of ground translations recorded by broadband seismometer, the vertical component of earthquake induced rotational ground motions is consistently measured by a ring laser sensor located in Wettzell, SE Germany. Significant rotational motions in the P coda of tele-seismic signals are either directly visible or can be inferred through the investigation of cross-correlation between transverse acceleration and vertical rotation rate. Theoretically, in spherically symmetric isotropic media we should not observe a vertical component of rotations before the onset of SH waves. Possible causes for the observed rotations in the P coda are: (1) tilt – ring laser coupling; (2) anisotropy; (3) topographic scattering; and (4) P-SH scattering in the crust. Here we show that P-SH scattering in the 3D random crust can explain the observations and allow us to constrain crustal scattering properties.
- BibTeX
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@article{id1309, author = {Pham, D. N. and Igel, H. and Wassermann, J. and K\"aser, M. and de la Puente, J. and Schreiber, U.}, doi = {10.1785/0120080101}, journal = {BSSA}, language = {en}, number = {2B}, pages = {1315-1332}, title = {Observations and modelling of rotational signals in the P-Coda: constraints on crustal scattering}, volume = {99}, year = {2009}, }
- EndNote
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%O Journal Article %A Pham, D. N. %A Igel, H. %A Wassermann, J. %A Käser, M. %A de la Puente, J. %A Schreiber, U. %R 10.1785/0120080101 %J BSSA %G en %N 2B %P 1315-1332 %T Observations and modelling of rotational signals in the P-Coda: constraints on crustal scattering %V 99 %D 2009