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RISS 인기검색어
- 검색키워드
- 저자 : Weijia Sun (검색결과 5 건)
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Seismic wave propagation through surface basalts – implications for coal seismic surveys
Weijia Sun,Binzhong Zhou,Peter Hatherly,Li-Yun Fu 한국지구물리.물리탐사학회 2010 지구물리와 물리탐사 Vol.13 No.1
Seismic reflection surveying is one of the most widely used and effective techniques for coal seam structure delineation and risk mitigation for underground longwall mining. However, the ability of the method can be compromised by the presence of volcanic cover. This problem arises within parts of the Bowen and Sydney Basins of Australia and seismic surveying can be unsuccessful. As a consequence, such areas are less attractive for coal mining. Techniques to improve the success of seismic surveying over basalt flows are needed. In this paper, we use elastic wave-equation-based forward modelling techniques to investigate the effects and characteristics of seismic wave propagation under different settings involving changes in basalt properties, its thickness,lateral extent, relative position to the shot position and various forms of inhomogeneity. The modelling results suggests that:1) basalts with high impedance contrasts and multiple flows generate strong multiples and weak reflectors; 2) thin basalts have less effect than thick basalts; 3) partial basalt cover has less effect than full basalt cover; 4) low frequency seismic waves (especially at large offsets) have better penetration through the basalt than high frequency waves; and 5) the deeper the coal seams are below basalts of limited extent, the less influence the basalts will have on the wave propagation. In addition to providing insights into the issues that arise when seismic surveying under basalts, these observations suggest that careful management of seismic noise and the acquisition of long-offset seismic data with low-frequency geophones have the potential to improve the seismic results.
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Seismic wave propagation through surface basalts - implications for coal seismic surveys
Sun, Weijia,Zhou, Binzhong,Hatherly, Peter,Fu, Li-Yun Korean Society of Earth and Exploration Geophysici 2010 지구물리와 물리탐사 Vol.13 No.1
Seismic reflection surveying is one of the most widely used and effective techniques for coal seam structure delineation and risk mitigation for underground longwall mining. However, the ability of the method can be compromised by the presence of volcanic cover. This problem arises within parts of the Bowen and Sydney Basins of Australia and seismic surveying can be unsuccessful. As a consequence, such areas are less attractive for coal mining. Techniques to improve the success of seismic surveying over basalt flows are needed. In this paper, we use elastic wave-equation-based forward modelling techniques to investigate the effects and characteristics of seismic wave propagation under different settings involving changes in basalt properties, its thickness, lateral extent, relative position to the shot position and various forms of inhomogeneity. The modelling results suggests that: 1) basalts with high impedance contrasts and multiple flows generate strong multiples and weak reflectors; 2) thin basalts have less effect than thick basalts; 3) partial basalt cover has less effect than full basalt cover; 4) low frequency seismic waves (especially at large offsets) have better penetration through the basalt than high frequency waves; and 5) the deeper the coal seams are below basalts of limited extent, the less influence the basalts will have on the wave propagation. In addition to providing insights into the issues that arise when seismic surveying under basalts, these observations suggest that careful management of seismic noise and the acquisition of long-offset seismic data with low-frequency geophones have the potential to improve the seismic results.
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박경옥(Kyoung-Ok Park),이상운(Sang-Un Lee),홍옥선(Ok-Sun Hong),이연선(Yeon-Sun Lee),리웨이쟈(Weijia Li) 충북대학교 생활과학연구소 2011 생활과학연구논총 Vol.15 No.2
The purpose of this study was to explore characteristics and development process of back-to-farm community villages that were developed by the rural village development policy in order to suggest basic information on the back-to-farm community development. Literature review and in-depth interview technique were main research methods in this study. Three resident representatives of community villages answered the semi-structured questionnaire regarding move-in reasons, location, residential environment, and resident participation of the villages. These were analyzed using content analysis technique. The findings are as follow. 1) Important factors of back-to-farm community village development were found to be project theme, continuous resident meeting, common space, and village regulation. It was necessary to build information system of various government subsidy programs to support farm village development. 2) Resident representatives pointed out the necessity of residents’ participation in development process before their move-in. Thus, local government should support development of training program for residents’ participation in development process and participation of professional groups who can conduct the program.
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