Influence of the Earth's Local Structure on Elastic Surface Deformations Caused by Atmospheric, Hydrologic, and Oceanic Loads
Abstract
The deformational response of the Earth to atmospheric surface pressure, water-storage loads, and ocean bottom pressure on seasonal or shorter time scales is usually represented by a set of elastic load Love numbers or alternatively the corresponding Green's function spectrum. As these response functions are determined for one radial Earth structure like PREM, they are not appropriate for small-scale surface loads, less than 2500km2, that probe the heterogeneous shallow crustal structure of the Earth. Typical small-scale mass load features occur along the major river channels and the ocean coastline. In order to consider variations in the Earth structure, we derive local Green's functions for each 1°x1° grid cell of the 3D crustal structure model CRUST1 and applied them to high-resolution atmospheric, hydrologic, and oceanic surface loads. We will discuss the sensitivity of the calculated load deformations to changes in the Earth structure.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2015
- Bibcode:
- 2015AGUFM.G54A..03D
- Keywords:
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- 1211 Non-tectonic deformation;
- GEODESY AND GRAVITY;
- 1217 Time variable gravity;
- GEODESY AND GRAVITY;
- 1218 Mass balance;
- GEODESY AND GRAVITY;
- 1225 Global change from geodesy;
- GEODESY AND GRAVITY