INDIKASI GUNUNGAPI BAWAH LAUT DI PERAIRAN SANGEANG SUMBAWA NUSA TENGGARA BARAT
Abstract
Penelitian dengan menggunakan metode seismik pantul saluran ganda (multichannel) dan geomagnet mengindikasikan adanya gunungapi bawah laut. Dari penampang rekaman seismik dapat ditafsirkan bahwa Gunungapi bawah laut ditandai dengan bentuk tonjolan atau terobosan menembus dasar laut. Dari data megnetik kelautan diperoleh bahwa pada lokasi gunungapi bawah laut diketahui nilai anomali intensitas magnet total cukup tinggi yaitu sekitar 124 nT. Umumnya anomali intensitas magnet tinggi terdapat di bagian selatan daerah penelitian yang ditafsirkan juga sebagai penipisan kerak atau adanya Gunungapi bawah laut. Bagian selatan memang banyak didapat Gunungapi seperti gunungapi Sangeang Api yang terdapat diujung timur dan rangkaian Gunungapi lainnya yang terdapat di pulau Sumbawa (Gunungapi Tambora dan lainnya).
Kata kunci metode seismik dan geomagnet, gunungapi bawah laut, Perairan Sangiang
The study is equipped by using multi-channel seismic reflection and marine geomagnetic method and it indicates a submarine volcano. The seismic reflection profile can be interpreted that the submarine volcano is characterized by the bulge or break shape penetrate the seabed. From the data obtained of marine geomagnetic, the location of submarine volcanoes known value of the total magnetic intensity anomalies is quite high which is about 124 nT. Generally, the intensity of high magnetic anomaly is located in the southern part of the study area. This anomaly is interpreted as a thinning crust or the presence of submarine volcanoes. The southern part is the area where volcanoes are found such as Sangeang Api volcano located at the eastern tip and other volcanoes series on the island of Sumbawa (volcano Tambora and others).
Keywords: seismic and geomagnetic methods, submarine volcanoes, Sangiang waters
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DOI: http://dx.doi.org/10.32693/jgk.13.2.2015.263
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