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Annual study of gravity anomalies in oceanic regions by altimeter satellite data
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Mohammadamin Ilka *   , Seyed roohollah Emadi |
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Abstract: (156 Views) |
| The purpose of this study is to obtain gravity anomalies from the data of altimeter satellites and to examine and compare them annually in the regions of the ocean where tsunamis have occurred.For this purpose, by analyzing the data of Jason 1,2, Envisat, Cryosat satellites from 2003 to 2014, the mean sea level was calculated, Then, from the difference of this level of mean dynamic topography MDT calculated from altimeter satellite data, geoid height was obtained.To obtain the gravitational anomaly, the remove-restore technique was used, in which the monthly geopotential models of Grace satellites, the size of the geoid height and the gravitational anomaly were extracted, and then the geoid residue was derived from the geoid difference between altimetry and geopotential model.In the next step, using the inverse solution of the Stokes integral by the fast Fourier technique, we obtain the residue of gravity anomalies.By comparing the annual changes of gravity anomalies in the tsunami area, it was observed that the changes of gravity anomalies in the desired area in the year of the tsunami have a jump compared to previous years. |
Article number: 8 |
| Keywords: sattelite altimetry, gravity anomaly, tsunami, geopotential model, fast fourier transform, remove-restore technique |
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Full-Text [PDF 699 kb]
(66 Downloads)
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Type of Study: Tarviji |
Subject:
Geo&Hydro
Received: 2021/03/18
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