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The Effects of Tropospheric Bias on Deformation Monitoring of MT. Guntur using GPS Survey Method

Hasanuddin Z. Abidin, O. Yolanda, I. Meilano, O.K. Suganda, M.A. Kusuma, D. Muhardi, B. Setyadi, R. Sukhyar, J. Kahar & T. Tanaka


Abstract. A reliable volcano deformation monitoring requires a high positioning accuracy, i.e. up to mm level in the case of reawakening volcanoes. As a consequence of this requirement, the errors and biases affecting the GPS positioning accuracy has to be eliminated or reduced, which one of them is the tropospheric bias. In the case of volcano deformation monitoring using the GPS survey method, due to a relatively large altitude variation in the stations altitude, the elfects of tropospheric bias could not be effectively reduced by the differencing process. In order to meet the accuracy requirement of volcano deformation monitoring system, this residual tropospheric bias, therefore, has to be somehow corrected or taken into account. In this paper, the effects of tropospheric bias on the volcano deformation monitoring will be discussed. The discussion is based on the results from the deformation monitoring of Guntur volcano in Garut, West Java, by using repeated GPS surveys.

Keywords: GPS, volcano, deformation, monitoring, tropospheric bias

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