ASEG Extended Abstracts - ASEG2012 - 22nd Geophysical Conference, 2012
ASEG2012 - 22nd Geophysical Conference, 2012
- Articles
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Multimodal direct fitting of SPAC coefficients using amplitude response
More LessAuthors Tatsunori Ikeda, Toshifumi Matsuoka, Takeshi Tsuji and Koichi HayashiSummaryWe usually analyse microtremors without any considerations of higher modes of surface waves. However, recent studies have demonstrated that the use of higher modes would improve estimated velocity models. In this study, we apply multi-mode analysis with amplitude response to the direct fitting method in SPAC method. The proposed method has the advantage that we don’t need to identify observed modes, which can avoid mode misidentification. The proposed method was applied to synthesized microtremors. Estimated SPAC coefficients were good agreed with theoretical ones proposed in this study, even if in the frequency where two modes have about the same power fractions. The Swave velocity was then successfully inverted by the direct fitting of SPAC coefficients. The proposed method also works well in the analysis of field data acquired in Tsukuba City, Japan. In the inversion performed in this study, we do not use prior information about velocity structure. It is concluded that the multi-mode analysis proposed here is very robust in the multimodal analysis in SPAC method.
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Coal seam roof stability prediction and evaluation based on GIS platform with multiple data sets
More LessAuthors Wang Huaihong, Gong Gu and Lv DaweiSummaryThis paper, based on GIS technology, combines multiple data sets such as three-dimensional seismic data, drilling, geophysical logging and mining geology data to evaluate and predict the stability of the coal seam roof. By analysing every factor affecting the stability of the coal seam roof, we establish an evaluation model of the coal seam roof stability, and we take the first mining area of coal seam 3 of Longgu Mine from the Juye Coalfield as an example to predict the stability of the coal seam roof.
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US coal geophysics expands and gains more support.
More LessAuthors Lawrence M. Gochioco, Fred Ruev jr. and Justin R. GochiocoSummaryThe US coal geophysics program was once the exclusive domain and best kept secret of one major coal company. The company was able to develop a full spectrum of remote-sensing technologies to address their complex upstream and downstream challenges. The program started in the mid-1970s, and greatly expanded a decade later with more robust and diverse applications. Innovative geophysical surveys were routinely conducted to enhance the company’s coal exploration, engineering, and environmental programs.
As the largest operator of underground longwall mines in the country, Consol Energy was able to improve their mining productivity and mine safety by detecting and imaging potential geologic anomalies that could create adverse underground mining conditions prior to mine development. High-resolution surface seismic surveys were routinely conducted years in advance of mine development. Other geophysical methods were at times employed as part of internal multi-disciplinary (geology, geophysics, geohydrology, and ground control) studies to address environmental, engineering, and permitting issues.
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