LITHO1.0: An Updated Crust and Lithosphere Model of the Earth (Postprint)
Abstract
The compilation of extremely large global datasets of group velocity for Rayleigh and Love waves from 10mHz to 40mHz have completed using a cluster analysis technique. The method has been extended to measure phase velocity to complement the group velocity with global data sets of longer period phase data that help to constrain deep lithosphere properties. To model these data, a starting model for the crust at a nominal resolution of 1 degree is required. This has been developed by constructing a map of crustal thickness using data from receiver function and active source experiments where available, and by using CRUST2.0 where other constraints are not available. Particular care has been taken to make sure that the locations of sharp changes in crustal thickness are accurately represented. This map is then used as a template to extend CRUST2.0 to 1 degree nominal resolution and to develop starting maps of all crustal properties. The data is being modeled using two techniques. The first is a linearized inversion about the 3D crustal starting model. Note that it is important to use local eigenfunctions to compute Frechet derivatives due to the extreme variations in crustal structure. Another technique uses a targeted grid search method.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 22, 2012
- Accession Number
- ADA566462
Entities
People
- Gabi Laske
- Michael E. Pasyanos
- T. G. Masters
- Zhitu Ma
Organizations
- University of California, San Diego