Constraints from normal modes and exotic body waves on the radial structure of the Earth's inner core

Details Constraints from normal modes and exotic body waves on the radial structure of the Earth's inner core Constraints from normal modes and exotic body waves on the radial structure of the Earth's inner core

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmdi53b..06w&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #DI53B-06

Other

7200 Seismology, 7203 Body Waves, 7207 Core (1212, 1213, 8124), 7255 Surface Waves And Free Oscillations, 8155 Plate Motions: General (3040)

Scientific paper

The thermal and compositional structure of the inner core is key to understanding the inner workings of our planet. Seismology is the only technique that can measure its elastic parameters and density, providing constraints for mineral physics and dynamical modeling of the Earth's core. Unfortunately, even the core's radial structure remains largely unknown due to different and uneven sampling of body waves and whole Earth oscillations. For example, widely ranging values of inner core shear attenuation and impedance contrast at the inner core boundary are invoked to explain observations of inner core shear waves such as PKJKP. Here, we aim to better constrain the radial structure by combining observations of exotic body waves and whole Earth oscillations. Normal modes tightly constrain the inner core compressional velocity at 11.15 km/sec and the shear wave velocity at 3.55 km/sec, in agreement with PKJKP observations. The normal modes also provide information on the shear attenuation structure at long periods, which will be compared with PKJKP observations at shorter periods. The detailed structure at the inner core boundary will be studied using other exotic inner core waves. PKIIKP is strongly sensitive to the jump in compressional velocity and PKJKP provides information on the shear wave velocity contrast. Using constraints from normal mode data, we search large earthquakes for observations of these waves. The (non)-identification of exotic inner core waves provides contraints on the core's radial structure.

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