Inner Core Attenuation Measurements

Published: 6 December 2024| Version 1 | DOI: 10.17632/9tphkfsrv9.1
Contributors:
Vernon Cormier,

Description

The data files here enable an estimate of the goodness of fit to observed PKIKP body waveforms of a 2-layered model of inner core attenuation, in which the boundary between and upper and lower inner core is varied.

Files

Steps to reproduce

Seismic waveform data were downloaded from IRIS-DMC. An Excel file and text files are provided for P attenuation measurements obtained from fitting the first half-cycle of PKIKP waveforms with an inner core attenuation operator and a far-field source-time function and average mantle attenuation operator for specific earthquake and stations. The best fitting inner core attenuation operator is parameterized by attenuation (1/Qp) at 1 Hz and a low-frequency corner of a relaxation spectrum assumed to be 5 decades wide in frequency (Cormier, V.F., and Li, X., J. Geophs. Res., 2002. Frequency-dependent seismic attenuation in the inner core. The Excel file assumes a 600 km radius of an innermost inner core, with column headings. A series of text files adjusts information in the Excel files for varying the radius of the boundary of the upper and lower inner core between radii 400 to 800 km. A Matlab file reads the text files, plots a Gaussian probability density for the attenuation in the upper and lower inner core, reports the attenuation values at the maximum of the probability density.

Institutions

University of Connecticut

Categories

Seismology

Funding

National Science Foundation

EAR 17-54498

Licence