Primayandi, Reno (2025) Analisis Geomorfologi Tektonik, Seismisitas Dan Neotektonik Akibat Sesar Sumatra Kawasan Solok Dan Sekitarnya Provinsi Sumatra Barat. Other thesis, Universitas Islam Riau.

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Abstract

The subduction of the Indian Ocean Plate and the Sunda Plate caused deformation of the Sumatra Island, resulting in the largest earthquake and the most destructive tsunami that has ever occurred on the face of the earth, namely on December 26, 2004. However, ironically, until now there has been no Seismicity Map, Earthquake Scenario Map and Geomorphology Tectonic Map available on the Sumatra Island in general and West Sumatra in particular. This is the main motivation of the author to provide useful and easily understood information for the public related to the tectonic development (seismicity, scenario, tectonic geomorphology) of the earthquake, in Solok and its surroundings, West Sumatra. The research method used is to combine secondary data with primary data obtained from recording tectonic geomorphology data in the field. The software used in this study includes ArcGIS, GeoMapApp, Faultkin, Iris Earthquake, using the Shuttle Radar Topography Mission base map with a resolution of 30 m and GMRT (Global Multi-Resolution Topography). Earthquake Moment Magnitude calculation will produce an earthquake scenario map (neotectonic) using several formulas. The results of this study show several tectonic geomorphological features in the form of triangular facets, river diversions with an average of 0.3 km, surface ruptures, and landslides. The dominant type of fault movement in the study area is the right shear fault (dextral). The author recommends 4 Centroid Moment Tensors (CMT) which are not shown at all in the GeoMapApp software, which represent fault parameters including: Galagah-Pakanrabaa Fault (GPF) 7.0 Mw, Pakanrabaa-Pauhduo Fault (PPF) 6.7 Mw, Rajobalun-Kapaualam Fault (RKF) 6.6 Mw, and Alahanbadil-Liki Fault (ALFF) 6.3 Mw. The Muara Labuah Valley is the largest valley formed in the research area caused by the movement of two main faults, namely the Pakanrabaa-Pauhduo Fault (PPF) and the Rajobalun-Kapaualam Fault (RKF). Keywords: Tectonic Geomorphology, Earthquake Scenario, Seismicity, Moment Magnitude, Solok and Surrounding Areas

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