Hardina, Ragil Ayu (2026) Kajian Geologi Struktur Dampak Pergerakan Sesar Berdasarkan Analisis Geomorfologi Tektonik dan Seismisitas Daerah Marudu Hingga Pitas, Sabah, Malaysia. Other thesis, Universitas Islam Riau.

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Abstract

The research area extends from Marudu to Pitas, Sabah, a part of Borneo Island that was previously considered stable. Research on tectonics and seismicity on Borneo Island remains limited, both in terms of data quantity and quality. Most previous studies have focused on regional geology and stratigraphy, while studies specifically addressing active tectonic activity are still relatively rare. Furthermore, the lack of detailed maps of tectonic geomorphology, seismicity, and earthquake scenarios creates a knowledge gap. Therefore, the authors were motivated to conduct research on tectonic geomorphology, seismicity analysis, and the preparation of neotectonic maps based on field data. The research method combines primary and secondary data collection. Primary data was analyzed in the studio using various software, such as ArcGIS for tectonic geomorphology mapping, GeoMapApp for seismicity mapping, and the application of prediction formulas.Moment magnitude (Mw) to compile an earthquake scenario map. This research produces output in the form of tectonic geomorphology maps, seismicity maps, and earthquake scenario maps, which are equipped with the latest field photo documentation. The tectonic geomorphology of the study area shows the development of nine main regime zones controlled by eleven major faults. The dominant landforms are structural valleys, with a total of 45 valleys and twelve large, densely populated valleys, formed by fault activity. In general, the tectonic regime is dominated by northwest-southeast-trending right-slip faults. The seismicity recommended by Geomapapp is very minimal, with the authors giving it a recommendation score of 11 Centroid Moment Tensor which is very important to provide fault parameter information. The results of the potential calculation, Moment magnitude 5.7 Mw – 6.4 Mw are classified as moderate to strong earthquakes. The greatest potential for earthquakes is generated by Tinduk – Taginambor Fault (TTF). Evidence of field deformation strengthens active tectonic activity, indicated by the presence of ridges, triangular facet, folds, offset layering and offset vein, and landslides. Analysis Strain Riedl Shear of the Taritipan – Sulu fault (TSF) produces a combination of simple composite displacement and pure compression (composite simple shear and compressive pure shear). Keywords: Tectonics, Tectonic Geomorphology, Seismicity, Earthquake

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