Abstract
Abstract. We installed GPS stations for monitoring of land subsidence of Kujukuri Plain in Chiba prefecture in 2003, and have been monitoring since then. In this paper, we discussed a data processing method capable of reducing noise in data collected by the GPS stations. Also, we compare the accuracy of leveling and GPS, and collected basic data for establishing a new monitoring system based on the combination of leveling and GPS.
Highlights
In Chiba prefecture,Japan, eight companies have exploited natural gas in Southern Kanto Natural Gas Field, which is a deposit of natural gas dissolved in water
Land subsidence in recent years has been reduced in many areas, land subsidence of more than 10 mm per annum has been observed in some places
Natural gas with formation water is mainly produced in the Kujukuri district
Summary
In Chiba prefecture,Japan, eight companies have exploited natural gas in Southern Kanto Natural Gas Field, which is a deposit of natural gas dissolved in water. The Kujukuri district has good gas production ratio, natural gas with formation water is mainly produced there. Land subsidence in this area was found in the late 1960s. The eight companies in this area have been making efforts to control land subsidence and have concluded the subsidence prevention agreement with the local government. Land subsidence in recent years has been reduced in many areas, land subsidence of more than 10 mm per annum has been observed in some places. The eight companies currently operate addressing environmental problems including land subsidence through the Environment Committee of the Japan Natural Gas Association Keiyo Natural Gas Association (hereinafter referred to as the Environment Committee). The monitoring and observation working group works under the commitee
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