Path: TopS1-Final ProjectGeophysics Engineering-FTTM2011

SURVEY GAYA BERAT PADA VOLCANIC ARC KABUPATEN FLORES TIMUR

Undergraduate Theses from JBPTITBPP / 2017-10-09 10:31:18
By : FACRY SALIM (NIM : 12305008), S1 - Department of Geophysical Engineering
Created : 2011, with 9 files

Keyword : tumbukan, sesar, pengolahan data gaya berat, CBA SRTM, deformasi, penipisan kerak, ring volcanic

Kabupaten Flores Timur merupakan volcanic arc hasil dari penunjaman lempeng Indo-Australia dan Eurasia. Terdapat 4 buah gunungapi aktif di daerah ini yang menarik untuk dikaji. Survey gayaberat dilakukan untuk mengetahui



fenomena bawah permukaan daerah ini. Dilakukan pengukuran sebanyak 301 titik dengan jarak antar stasiun 1000-1500 m. Koreksi data gayaberat diaplikasikan



hingga diperoleh nilai anomali gayaberat, kemudian dipetakan dalam bentuk kontur. Peta kontur menunjukkan anomali tinggi di utara Larantuka dan anomali rendah di wilayah selat flores dan tenggara Pulau Adonara. Digunakan data CBA SRTM hasil pengukuran satelit guna memperoleh informasi daerah yang tidak tercakup oleh stasiun pengukuran gayaberat darat.



Pemodelan kedepan 2.5 D anomaly gayaberat darat dan satelit dengan estimasi kedalaman sumber hasil analisis spektrum dan informasi litologi dari peta geologi memperlihatkan struktur sesar naik di bagian utara Larantuka dan terdapat proses naiknya magma di bawah area gunungapi yang menyebabkan deformasi pada kerak akibat suhu yang disertai dengan deformasi akibat pembebanan oleh massa gunungapi sehingga menyebabkan penipisan kerak di beberapa daerah tertentu. Terdapat hubungan antara gunungapi di sekeliling selat flores



membentuk ring volcanic, diduga ketiga gunungapi tersebut dihasilkan oleh satu sumber magma yang sama di bawah selat flores.

Description Alternative :

East Flores Regency is a volcanic arc resulting from the subduction Indo-Australia and Eurasian plate. There are 4 active volcanoes in this area is interesting to study. Gravity survey conducted to determine subsurface



phenomenon of this area. Measurements were taken as much as 301 points with the distance between stations from 1000 to 1500 m. Gravity data correction is applied to obtained gravity anomaly values, and then mapped in the form of countours. Countour map shows a high anomaly in the north Larantuka and low anomalies in the Flores Strait region and southeastern of Adonara island. CBA



SRTM from satellite measurement is used to obtain local information that is not covered by land gravity measurement.



2.5D forward modeling of land and satellite gravity anomaly with an estimated depth of the source generated from spectrum analysis and lithological information from geological maps showing thrust fault structure on the north Larantuka and there are processes of magma rising beneath the volcano area which causes deformation of the crust due to temperature which is accompanied by deformation due to mass loading by the volcano, causing thinning of the crust in certain areas. There is a relationship between volcanoes around the flores strait forming ring volcanic, an estimated that the three volcanoes are produced by the same magma source beneath the strait flores.

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PropertyValue
Publisher IDJBPTITBPP
OrganizationS1 - Department of Geophysical Engineering
Contact NameUPT Perpustakaan ITB
AddressJl. Ganesha 10
CityBandung
RegionJawa Barat
CountryIndonesia
Phone62-22-2509118, 2500089
Fax62-22-2500089
Administrator E-maildigilib@lib.itb.ac.id
CKO E-mailinfo@lib.itb.ac.id

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