IDENTIFICATION OF SUBSURFACE LAYERS USING THE SEISMIC REFRACTION METHOD IN THE TABIANG BARASOK AREA

Khania Zahra; Ahmad  Fauzi; Hamdi  Rifai; Zulhendra Zulhendra

doi:10.24036/3n22y328

Authors

Khania Latifa Zahra Department of Physics, Padang State University, Padang Author
Ahmad Fauzi Department of Physics, Padang State University, Padang Author
Hamdi Department of Physics, Padang State University, Padang Author
Zulhendra Department of Physics, Padang State University, Padang Author

DOI:

https://doi.org/10.24036/3n22y328

Keywords:

Refraction seismic, subsurface layer, Tabiang Barasok

Abstract

The Tabiang Barasok area is located in the city of Bukittinggi which has a high index of rainfall and earthquakes, besides that the city of Bukittinggi is directly related to the Sianok segment which results in this city having natural disaster vulnerability landslide, such as the incident around the tabiang barasok area caused by the earthquake in 2009 which caused landslides, resulting in the smoke on the barasok cliffs being covered. Investigation of the subsurface layer is very important to find out some information before development and disaster mitigation. Data collection was conducted directly at the research site, in the Tabiang Barasok area, using equipment such as a hammers, seismic iron plates, 12 geophones, trigger cables, sysmatrack-Mae, geophone cable, and GPS for coordinate and elevation . the primary wave velocity and depth values at each subsurface trajectory are processed using the seismic refraction method, which will then be interpreted and modeled using time term inversion. After data processing the results obtained in the first layer wave dominated of unsaturated gravel, unsaturated sand material. The second layer for routes 2 and 4 obtained from the interpretation result in the form of alluvium. The alluvium layer is composed of volcanic ash material which is waterproof and becomes slippery when it rains, so that this hard alluvium will act as an undderound layer for materials that experience weathering above the hard layer coming out of the cliff.

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