Indikasi Struktur Patahan Berdasarkan Data Citra Satelit dan Digital Elevation Model (DEM) Sungai Siak, Tualang dan Sekitarnya Sebagai Pertimbangan Pengembangan Pembangunan Wilayah
Indications Fault Structure Based on Satellite Imagery Data and Digital Elevation Model (DEM) River Siak, Tualang Area As Development considerations Regional development
Keywords:
Fault, Satellite Imagery Data, Digital Elevation ModelAbstract
[ID] Struktur patahan dapat ditunjukkan dengan adanya indikasi yang berupa pola kelurusan sungai, adanya offset litologi, dan lainnya. Berdasarkan data citra satelit dan digital elevation model terdapat kemunculan indikasi adanya struktur patahan pada daerah tualang dan sekitarnya. Hal ini terlihat dari kelurusan Sungai Siak. Anomali ini sangat terlihat jelas pada pola aliran sungai yang menujukkan perubahan signifikan pada daerah hulu yang berbentuk meander / berkelok kemudian berubah seketika menjadi bentuk straight/ lurus. Hal ini menunjukkan adanya indikasi struktur patahan. Berdasarkan kenampakan citra satelit terlihat adanya offset perbukitan yang bergeser dengan pergerakan patahan. Hal ini juga didukung dengan data pendukung kerangka tektonik cekungan sumatera tengah yang menandakan adanya fase kompresi selama Oligosen Tengah sampai Miosen Tengah dengan arah tegasan Utara – Selatan dan mengalami reaktivasi pada pliosen – pleistosen. Hal ini diharapkan menjadi perhatian bagi daerah – daerah yang akan dilalui patahan tersebut berkaitan dengan pengembangan pembangunan, karena setiap pergerakan lempeng terjadi bisa mereaktifasi patahan tersebut dan mempengaruhi daerah – daerah disekitarnya.
[EN] The fault structure can be shown by several indication such as pattern of alignment of the river, the offset lithology, and others. Based on data from satellite imagery and digital elevation models there are emergence of indications of faults structure in the Tualang Area and its surroundings, It is seen from the lineament of the Siak river, these anomalies are very clearly shown in the flow pattern of the river that showed significant changes in upstream areas which start from meanders type of channel and then changed instantly into straight shape as an indication of fault structure. Based on feature on satellite image, there are shifting hills by fault movement. This is also supported by a tectonic framework of Central Sumatran Basin, which indicates the compression phase during Middle Oligocene to Middle Miocene with trend towards North - South direction and reactivated in the Pliocene - Pleistocene. It has to be considered for the regional development in the area which will be affected by the fault structure, because every movement of the plates can reactivate the fault and affects the surrounding areas.
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