-
oa Simple assessment of shallow velocity structures with small-scale microtremor arrays: interval-averaged S-wave velocities
- Australian Society of Exploration Geophysicists
- Source: Exploration Geophysics, Volume 49, Issue 6, Nov 2018, p. 922 - 927
-
- 11 Feb 2018
- 18 Feb 2018
- 01 Nov 2018
Abstract
This article describes a simple method for estimating interval-averaged S-wave velocities for 10-m depth ranges down to a depth of 30 m. Possibilities and limitations of this method are examined by using the analysis results of the microtremor data obtained in the town of Mashiki, Kumamoto Prefecture, Japan.
,This article describes a method for processing microtremor records from a small-scale seismic array that allows interval-averaged S-wave velocities to be estimated for 10-m depth ranges down to a depth of 30 m. The method was applied to microtremor data obtained in the town of Mashiki, Kumamoto Prefecture, Japan, and the analysis results were evaluated through a comparison with available PS logs and sections obtained by surface-wave methods. It turned out that the interval-averaged S-wave velocity estimates may be subject to errors of up to 20–30% in absolute values, but it was shown that the method can help evaluate relative spatial variations in those S-wave velocities. In view of the simplicity of analysis, the analyser-independent nature of the results and the limitations of analysis accuracy, the interval-averaged S-wave velocity estimation method presented here could be used as an effective tool for the preliminary analysis of microtremor data from small-scale seismic arrays.
]