Rotational motions for teleseismic surface waves

Details Rotational motions for teleseismic surface waves Rotational motions for teleseismic surface waves

Aug 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011georl..3815301l&link_type=abstract

Geophysical Research Letters, Volume 38, Issue 15, CiteID L15301

Statistics

Computation

1

Computational Geophysics: Data Analysis: Algorithms And Implementation, Exploration Geophysics: Data Processing, Seismology: Earthquake Ground Motions And Engineering Seismology (4302), Seismology: Surface Waves And Free Oscillations

Scientific paper

We report the findings for the first teleseismic six degree-of-freedom (6-DOF) measurements including three components of rotational motions recorded by a sensitive rotation-rate sensor (model R-1, made by eentec) and three components of translational motions recorded by a traditional seismometer (STS-2) at the NACB station in Taiwan. The consistent observations in waveforms of rotational motions and translational motions in sections of Rayleigh and Love waves are presented in reference to the analytical solution for these waves in a half space of Poisson solid. We show that additional information (e.g., Rayleigh wave phase velocity, shear wave velocity of the surface layer) might be exploited from six degree-of-freedom recordings of teleseismic events at only one station. We also find significant errors in the translational records of these teleseismic surface waves due to the sensitivity of inertial translation sensors (seismometers) to rotational motions. The result suggests that the effects of such errors need to be counted in surface wave inversions commonly used to derive earthquake source parameters and Earth structure.

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