Erratum: On the effectiveness of directional derivative based filters on gravity anomalies for source edge approximation: synthetic simulations and a case study from the Aegean graben system (western Anatolia, Turkey)

2013 ◽  
Vol 10 (5) ◽  
pp. 059601
Author(s):  
Yunus Levent Ekinci ◽  
Can Ertekin ◽  
Erdinç Yiğitbaş
Keyword(s):  
Directional Derivative ◽  
Gravity Anomalies ◽  
Western Anatolia

scholarly journals Regional Recovery of Gravity Anomaly from the Inversion of Diagonal Components of GOCE Gravitational Tensor: A Case Study in Ethiopia

2018 ◽  
Vol 53 (2) ◽  
pp. 55-74 ◽  
Author(s):  
Mehdi Eshagh ◽  
Andenet A. Gedamu ◽  
Tulu B. Bedada
Keyword(s):  
Gravity Anomaly ◽  
Gravity Field ◽  
Ocean Circulation ◽  
Opposite Sign ◽  
Joint Inversion ◽  
Gravity Anomalies ◽  
The Earth ◽  
Tikhonov Regularisation ◽  
The Difference

Abstract The tensor of gravitation is traceless as the gravitational field of the Earth is harmonic outside the Earth’s surface. Therefore, summation of the 2nd-order horizontal derivatives on its diagonal components should be equal to the radial one but with the opposite sign. The gravity field can be recovered locally from either of them, or even their combination. Here, we use the in-orbit diagonal components of the gravitational tensor measured by the gravity field and steady state ocean circulation explorer (GOCE) mission for recovering gravity anomaly with a resolution of 1°×1° at sea level in Ethiopia. In order to solve the system of equations, derived after discretisation of integral equations, the Tikhonov regularisation is applied and the bias of this regularisation is estimated and removed from the estimated gravity anomalies. The errors of the anomalies are estimated and their significance of recovery from these diagonal components is investigated. Statistically, the difference between the recovered anomalies from each scenario is not significant comparing to their errors. However, their joint inversion of the diagonal components improved the solution by about 1 mGal. Furthermore, the inversion processes are better stabilised when using errors of the input data compared with its exclusion, but at the penalty of degradation in accuracy of the estimates.

Modernity From Below: The Amalgamated Oriental Carpet Manufacturers, Ltd. of Izmir, 1907-1922

2015 ◽  
Vol 14 (4) ◽  
pp. 413-429
Author(s):  
Elena Frangakis-Syrett
Keyword(s):  
General Population ◽  
World Market ◽  
Turn Of The Century ◽  
Western Anatolia ◽  
Business Sector ◽  
Urban Center ◽  
The World

Turkish carpet making and marketing, a rapidly expanding niche in the world market in the latter 19th and early 20th centuries, offers an excellent case study for modernity in a major Ottoman provincial urban center such as Izmir and its hinterland in western Anatolia. Representative of the changes that the city’s economy was undergoing was the Amalgamated Oriental Carpet Manufacturers Limited (ocm), which included multiethnic and multiconfessional actors similar to the city’s business sector and general population, as well as dual nodes of administration in London and Izmir. This case study of ocm (and of its emulators) reveals the degree of modernity that Izmir’s business circles were capable of at the turn of the century, and their ability to put together a trust and strategize accordingly along similar lines as the trusts in Europe or the us.

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