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Observations and modelling of rotational signals in the P-Coda: constraints on crustal scattering

Pham, D. N., H. Igel, J. Wassermann, M. Käser, J. de la Puente, and U. Schreiber (2009), Observations and modelling of rotational signals in the P-Coda: constraints on crustal scattering, BSSA, 99(2B), 1315-1332, doi:10.1785/0120080101.

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
@article{id1309,
  author = {D. N. Pham and H. Igel and J. Wassermann and M. K{\"a}ser and J. de la Puente and U. Schreiber},
  journal = {BSSA},
  month = {may},
  number = {2B},
  pages = {1315-1332},
  title = {{Observations and modelling of rotational signals in the P-Coda: constraints on crustal scattering}},
  volume = {99},
  year = {2009},
  doi = {10.1785/0120080101},
}
EndNote
%0 Journal Article
%A Pham, D. N. 
%A Igel, H.
%A Wassermann, J.
%A Käser, M.
%A de la Puente, J.
%A Schreiber, U.
%D 2009
%N 2B
%V 99
%J BSSA
%P 1315-1332
%T Observations and modelling of rotational signals in the P-Coda: constraints on crustal scattering
%8 may
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Printed 15. Dec 2019 04:02