Abstract
Gorontalo is an area located in the North Arm of Sulawesi which has a complex geological structure as a result of the submergence of the Sulawesi Sea and East Sangihe so that this area is considered an earthquake-prone area. The existence of the regional structure and the mapping of the earthquake point distribution is interesting to be studied more deeply because it affects seismic activity in the area. The purpose of this study is to analyze earthquakes in the Asparaga area based on their depth and magnitude and to relate them to the geological structures found in the study area. The earthquake data used were obtained from USGS. Satellite image data used is the SRTM satellite image. Earthquake data is mapped to produce depth maps, magnitude maps, and earthquake zoning maps. Lineament data were processed using a rosette diagram. Lineament can reflect the morphology observed on the earth's surface as a result of the activity of geological forces. The results showed that the Asparaga area had shallow earthquake depths and moderate to large magnitudes. The focus of the earthquake was right on the path traversed by the geological structure and its relatively northwest-southeast direction. The geological structure in the research location is the epicenter of the earthquake because it is crossed by regional geological structures.
Highlights
Gorontalo is an area located in the North Arm of Sulawesi which has a complex geological structure as a result of the submergence of the Sulawesi Sea and East Sangihe so that this area is considered an earthquake-prone area
The results showed that the Asparaga area had shallow earthquake depths and moderate to large magnitudes
Analisis Kegempaan di Zona Sesar Palu Koro, Sulawesi Tengah
Summary
Provinsi Gorontalo terletak di Indonesia bagian timur dan dibentuk oleh beberapa subduksi yaitu subduksi Laut Sulawesi yang berada di sebelah utara serta subduksi Sangihe Timur yang berada di sebelah tenggara (Simandjuntak, 1992). Adapun tujuan dari penelitian ini yaitu menganalisis gempabumi daerah Asparaga berdasarkan kedalaman dan magnitudo gempabumi serta menghubungkannya dengan struktur geologi yang bekerja pada daerah penelitian. Peta zonasi magnitudo gempa diperkirakan bahwa struktur geologi tersebut menjadi penyebab utama adanya titik fokus gempa yang terjadi pada daerah Asparaga bagian timur. Peta sebaran gempa berdasarkan magnitudo gempabumi di daerah Asparaga menunjukkan keterdapatan tiga titik gempa dengan magnitudo berbeda-beda yaitu magnitudo moderate (5.0-5.9 Mw) berwarna hijau, magnitudo strong (6.0-6.9 Mw) berwarna ungu, dan magnitudo major (7.0-7.9 Mw) berwarna jingga (Gambar 4). Peta sebaran magnitudo gempa berdasarkan zonasi gempabumi menunjukkan bahwa sebagian kecil daerah Asparaga bagian timur dan selatan didominasi oleh magnitudo moderate. Hal ini menunjukkan bahwa bagian timur daerah penelitian didominasi oleh gempa dangkal dan daerah barat didominasi gempa dengan magnitudo tinggi. Berdasarkan peta kelurusan dan hasil analisis kelurusan pada diagram roset diperoleh bahwa arah umum kelurusan yaitu barat laut–tenggara (Gambar 7)
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