Analysis of Fault Lines in the City of Manado

The Indonesian region with high seismic activity, Manado City, is situated at the convergence of four major tectonic plates on Earth: the Eurasian Plate, Indo-Australian Plate, Pacific Plate, and Philippine Plate.

This study aimed to identify the Manado fault line. The Geoelectric PQWT-TC 300 tool was utilized, which can detect up to a depth of 300 meters vertically.

The research was conducted to analyze and to create a map of the Manado fault line. This study is an efforts to mitigate earthquake disasters, which involves constructing earthquake-resistant infrastructure.

The Manado fault line was measured for 17 lines; each line was 9 to 41m in length, and the result was found to be Manado fault at line 23 Kayuragi-1 and line 70 among the 17 lines.

The depth of the Manado Fault started from 30m to 270m from the surface layer. The resistivity values of fault were 0 Ω.

The present identification of the Manado fault line closely align with previous analysis. The activity of the Manado fault line has not been detected in the last 1800 years. The present method yielded better results for identifying the Manado fault line than the previous method.