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Abstract

The authors applied time-term method in a seismic refraction survey to determine the variation of the<br>thickness of a gravel layer overlaying a weathered granite basement in a 100 x 400m area. The reason why we used<br>time-term method in this survey was that the ground surface at the site was covered with boulders as large as 1<br>meter in diameter, it was difficult to apply conventional refraction survey in which sources and receivers have to be<br>in a line. Before doing field measurements, it seemed that the velocity structure of the site satisfied all<br>requirements for the applicability of time-term method. However, when analyzing observed seismic refraction data,<br>we found that the structure was not satisfied one of the requirements that the basement had no lateral variation in<br>velocity. To determine the variation of basement velocities as well as the distribution of the thickness of gravel<br>layer, we incorporated a tomographic technique into a conventional method and successfully applied it to the survey<br>data.

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/content/papers/10.3997/2214-4609-pdb.206.1995_049
1995-04-23
2021-10-16
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http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609-pdb.206.1995_049
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