Analysis of the Impact of Earthquakes in Medan (North Sumatra, Indonesia) using MASW, SPAC, and HVSR Methods
Teguh Rahayu (a*), Zulkifli Nasution (a), Roesyanto (a), Dwikorita Karnawati (b)

a) Management of Natural Resources and Environment, Sumatera Utara University, Medan, Indonesia
*ayugraha76[at]gmail.com
b) Agency for Meteorology, Climatology and Geophysics, Jakarta, Indonesia

Abstract

The city of Medan located in the northern part of Sumatra has often been shaken by earthquake both from subduction zone and active faults. To investigate the impact of earthquakes in the city, we used the Multichannel Seismic Analysis Surface Wave (MASW), Spatial Autocorrelation (SPAC), and Horizontal to Vertical Spectral Ratio (HVSR) methods. The results of these methods show that Tdom values vary between 0.0907 s and 8.30723 s which means that the subsurface beneath Medan consists of soft to medium soil type and the engineering bedrock at a depth of 290-300 m. Our results show that several areas in Medan have a high risk of earthquakes impacts. The results of this study can be used by the Medan government for making regional planning decisions and developing infrastructure as well as this study can be taken into account in the preparation of regional regulations for mitigating earthquakes impacts such as landslides, liquefaction, and ground movement.

Keywords: Medan- earthquake- MASW- SPAC- HVSR

Topic: Physics