We performed a passive seismic survey at Laliptur, south of Kathmandu. The study area spans between 27.61N - 85.29E and 85.35N - 27.65E. Ambient vibrations on a 19 almost regular grid points (2 km step) plus 8 other surveys in Kathmandu urban area were recorded. We employed, for comparison purpose, both a TROMINO® (Micromed, Italy) and a Trillium 20s (Nanometrics, USA) velocimeters. In 12 sites a small-scale surface wave prospection was performed using a 50m long geophones array in order to obtain also the subsoil Vs profiles. The standard Horizontal-to-Vertical Spectral Ratio (HVSR) analyses suggest that the frequency of this part of the Kathmandu basin is within the 0.4 – 0.6 Hz range, lower than previous studies. Seismic noise was also recorded on some buildings: a) a 14-story tower; b) a 7-story school; c) a 3-story orphanage and d) a 2-story standard house. For each building a measure outside in free field and at different levels inside was performed. The Standard Spectral Ratio technique (SSR) was adopted to identify the main vibration modes of the structures.

Enviromental and on buildings noise measures: Laliptur (Kathmandu)

Sandron D;Pettenati F;Giorgi M;
2016

Abstract

We performed a passive seismic survey at Laliptur, south of Kathmandu. The study area spans between 27.61N - 85.29E and 85.35N - 27.65E. Ambient vibrations on a 19 almost regular grid points (2 km step) plus 8 other surveys in Kathmandu urban area were recorded. We employed, for comparison purpose, both a TROMINO® (Micromed, Italy) and a Trillium 20s (Nanometrics, USA) velocimeters. In 12 sites a small-scale surface wave prospection was performed using a 50m long geophones array in order to obtain also the subsoil Vs profiles. The standard Horizontal-to-Vertical Spectral Ratio (HVSR) analyses suggest that the frequency of this part of the Kathmandu basin is within the 0.4 – 0.6 Hz range, lower than previous studies. Seismic noise was also recorded on some buildings: a) a 14-story tower; b) a 7-story school; c) a 3-story orphanage and d) a 2-story standard house. For each building a measure outside in free field and at different levels inside was performed. The Standard Spectral Ratio technique (SSR) was adopted to identify the main vibration modes of the structures.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/20.500.14083/6051
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