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Imaging the graben structure in the deep basin with a microtremor profile crossing the Yinchuan City
Microtremor studies were originated in Japan and have gained broader recognition in studying the site effect in earthquake strong ground motion. In recent years, microtremors have also been used in investigating the subsurface structures of a basin. There are also many reports of using array observation to invert the crustal structure; it is particularly popular in Japan. However, to our knowledge, there has been no report on using the spectral ratios between the horizontal components of a microtremor relative to the vertical component, H/V, to deduce the basin's structure, whose thickness could reach a few kilometres, through dense microtremor observation independently. This paper reports the results from a microtremor observation profile crossing the Yinchuan City to study the crustal structure of the Yinchuan Basin, which is the west border of the Ordos block. This basin is a continent graben-basin. The sedimentary layer is very deep; the Quaternary alone is reaching 1600 m. We used the long-period velocity seismometer in this study. The auto-correlation function analysis is used to get the H/V spectral ratio, and to investigate the crustal structure based on the fundamental frequency obtained from the H/V spectra. We have used two methods to verify the computation results. The first one is to compare the crustal structure results with those obtained from seismic explorations. The two results are highly consistent. The second method is to compare the theoretical prediction of the microtremor characteristics using the deduced basin model with real observations. It is shown that it is practical and economical to use densely distributed single-point microtremor observations to study the basal structure of deep basins with decent precision.
Imaging the graben structure in the deep basin with a microtremor profile crossing the Yinchuan City
Microtremor studies were originated in Japan and have gained broader recognition in studying the site effect in earthquake strong ground motion. In recent years, microtremors have also been used in investigating the subsurface structures of a basin. There are also many reports of using array observation to invert the crustal structure; it is particularly popular in Japan. However, to our knowledge, there has been no report on using the spectral ratios between the horizontal components of a microtremor relative to the vertical component, H/V, to deduce the basin's structure, whose thickness could reach a few kilometres, through dense microtremor observation independently. This paper reports the results from a microtremor observation profile crossing the Yinchuan City to study the crustal structure of the Yinchuan Basin, which is the west border of the Ordos block. This basin is a continent graben-basin. The sedimentary layer is very deep; the Quaternary alone is reaching 1600 m. We used the long-period velocity seismometer in this study. The auto-correlation function analysis is used to get the H/V spectral ratio, and to investigate the crustal structure based on the fundamental frequency obtained from the H/V spectra. We have used two methods to verify the computation results. The first one is to compare the crustal structure results with those obtained from seismic explorations. The two results are highly consistent. The second method is to compare the theoretical prediction of the microtremor characteristics using the deduced basin model with real observations. It is shown that it is practical and economical to use densely distributed single-point microtremor observations to study the basal structure of deep basins with decent precision.
Imaging the graben structure in the deep basin with a microtremor profile crossing the Yinchuan City
Imaging the graben structure in the deep basin with a microtremor profile crossing the Yinchuan City
Boming Zhao (author) / Xiaofeng Xie (author) / Chizhang Chai (author) / Heqing Ma (author) / Xiwei Xu (author) / Du Peng (author) / Wang Yin (author) / Jin Tao (author)
Journal of Geophysics and Engineering ; 4 ; 293-300
2007-09-01
8 pages
Article (Journal)
Electronic Resource
English
Imaging the graben structure in the deep basin with a microtremor profile crossing the Yinchuan City
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