Estimation of S-wave velocity structure for sedimentary layered media using Microtremor array measurements in Palu City, Indonesia

Pyi, Soe Thein and Pramumijoyo, Subagyo and Brotopuspito, Sri Kibrani and Junji, Kiyono and Wilopo, Wahyu and Aiko, Furukawa and Setianto, Agung and Putra, Rusnardi Rahmad (2015) Estimation of S-wave velocity structure for sedimentary layered media using Microtremor array measurements in Palu City, Indonesia. International Journal of Sustainable Future for Human Security, 28. pp. 595-605. ISSN 2187-4587

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Abstract

In this study, 8 array microtremor measurements have performed in Palu City, Indonesia for S-wave velocity profiles, which will be used in seismic hazard mapping. Four accelerometers were used in each array observation site. One was installed at a center of the circle with a radius, r. Other three were arranged on the circle with a shape of regular triangle. Sequential observations were conducted three times by changing the array radius; r=3, 10 and 30 meters. The ground profile was estimated by means of the dispersion curves obtained using the Spatial Autocorrelation (SPAC) methods. The Particle Swarm Optimization (PSO) technique was introduced to determine the dispersion curves. Unified two-layered model were reconstructed by averaging the f irst three layers obtained from array observation. The shear wave velocity of the top layer is Vs 300 m/s. Based on layer m odels identified, sedimentary layer was estimated around Palu City. Understanding the parameters of sedimentary layersis important for seismic hazard mitigation and environmental planning in Paul City.

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