Journal of Mathematical and Fundamental Sciences | 卷:48 |
Site Response Characteristics of Simeulue Island, Indonesia as Inferred from H/V Spectral Ratio of Ambient Noise Records | |
Nugroho Dwi Hananto1  Lina Handayani1  Titi Anggono2  Syuhada2  | |
[1] Research Center for Geotechnology, Indonesian Institute of Sciences, Jl. Cisitu Sangkuring, Bandung 40135; | |
[2] Research Center for Physics, Indonesian Institute of Sciences, Kawasan PUSPIPTEK Serpong, Tangerang 15310; | |
关键词: ambient noise; amplification factor; fundamental frequency; H/V spectral ratio; site response; Simeulue Island; | |
DOI : 10.5614/j.math.fund.sci.2015.48.2.4 | |
来源: DOAJ |
【 摘 要 】
Simeulue Island is an outer island arc west of Sumatra Island. The island is located close to the interface of the subduction zone between the Indo-Australian and Eurasian plates. Seismic activities around the island include devastating megathrust earthquakes, such as the 2004 MW 9.2 Sumatra-Andaman and 2005 MW 8.7 Nias earthquakes. We have investigated site response characteristics using the Horizontal-to-Vertical (H/V) Spectral Ratio method based on continuous ambient noise records from eight broadband seismometers. From the calculation results, generally, strong peaks were observed in the H/V spectral ratio curves caused by strong impedance contrast in this area. However, the BATU, LABU and DEHI sites showed relatively flat H/V spectral ratio curves caused by a lack of sharp impedance contrast beneath the site. Multiple peaks were observed at several sites, which may indicate the presence of a more highly weathered soil/clay layer on top of a more compact medium. H/V peak frequencies, which reveal the fundamental resonant frequencies of the soil sites, were generally observed in the range of 2.0 Hz-16.4 Hz.
【 授权许可】
Unknown