Using Multichannel Analysis of Surface Wave to Assess Bedrock Depth in Grand Aceh Baet Residential Area

Abstract Inadequate foundation studies had over time led to quite a number of mishaps, resulting in loss of lives and properties. To address this issue, a Multichannel Analysis of Surface Wave (MASW) survey was conducted at the proposed Grand Aceh Housing site to characterize the subsurface and determine the depth to the bedrock, ensuring a stable foundation for the Rusunawa construction. The survey was performed along four profile lines using a PASI 16S-24P seismograph. The acquired data were processed with Geopsypack Geopsy and Dinver version 2.5.0 and then modelled into 2D data using Surfer version 13. The results identified four distinct layers with varying depths and thicknesses: the first layer with shear wave velocity ≤175 m/s is classified as soft soil layer (SE), the second layer as medium soil (SD) with Vs 175-350 m/s, the third layer as solid soil and soft rock (SC) with Vs 350-750 m/s, and the fourth layer as rock layer (SB) with Vs 750-1200 m/s. The findings of this study suggest that the fourth layer is bedrock, capable of supporting the Rusunawa foundation.