Interpretation of general geophysical patterns in Iran based on GRACE gradient component analysis
2008 (English)In: Acta Geophysica, ISSN 1895-6572, Vol. 56, no 2, 440-454 p.Article in journal (Refereed) Published
Only with satellites it is possible to cover the entire Earth densely with gravity field related measurements of uniform quality within a short period of time. However, due to the altitude of the satellite orbits, the signals of individual local masses are strongly damped. Based on the approach of Petrovskaya and Vershkov we determine the gravity gradient tensor directly from the spherical harmonic coefficients of the recent EIGEN-GL04C combined model of the GRACE satellite mission. Satellite gradiometry can be used as a complementary tool to gravity and geoid information in interpreting the general geophysical and geodynamical features of the Earth. Due to the high altitude of the satellite, the effects of the topography and the internal masses of the Earth are strongly damped. However, the gradiometer data, which are nothing else than the second order spatial derivatives of the gravity potential, efficiently counteract signal attenuation at the low and medium frequencies.
In this article we review the procedure for estimating the gravity gradient components directly from spherical harmonics coefficients. Then we apply this method as a case study for the interpretation of possible geophysical or geodynamical patterns in Iran. We found strong correlations between the cross-components of the gravity gradient tensor and the components of the deflection of vertical, and we show that this result agrees with theory. Also, strong correlations of the gravity anomaly, geoid model and a digital elevation model were found with the diagonal elements of the gradient tensor.
Place, publisher, year, edition, pages
2008. Vol. 56, no 2, 440-454 p.
global geopotential model, gravity anomaly, deflection of vertical, geoid, GRACE, digital elevation model
Earth and Related Environmental Sciences
IdentifiersURN: urn:nbn:se:kth:diva-10771DOI: 10.2478/s11600-007-0050-2ISI: 000254400500013ScopusID: 2-s2.0-41549108039OAI: oai:DiVA.org:kth-10771DiVA: diva2:227929
QC 20100920. Tidigare titel "Interpretation of the general geophysical patterns of Iran based on the gradient components analysis of the GRACE".