![Page 1: ANALISA STRUKTUR BAWAH PERMUKAAN TANAH DI …repository.its.ac.id/51745/2/1113201201-Presentation.pdf•Gelombang VLF-EM •NA-MEMD •Filter Karous-Hjelt •Inversi •Finite Element](https://reader036.vdokument.com/reader036/viewer/2022070217/61214f9734b3c1759b6e34f8/html5/thumbnails/1.jpg)
ANALISA STRUKTUR BAWAH PERMUKAAN TANAHDI SEKITAR CANDI GAMBAR WETAN, KABUPATEN BLITAR DENGAN
METODE VERY LOW FREQUENCY ELECTROMAGNETIC (VLF-EM)
Pembimbing: Prof. Dr. rer. nat. Bagus Jaya Santosa, SU
MIFTAKHUL MAULIDINA
Jurusan Fisika
Institut Teknologi Sepuluh Nopember
Program Magister Bidang Keahlian Geofisika
2014
![Page 2: ANALISA STRUKTUR BAWAH PERMUKAAN TANAH DI …repository.its.ac.id/51745/2/1113201201-Presentation.pdf•Gelombang VLF-EM •NA-MEMD •Filter Karous-Hjelt •Inversi •Finite Element](https://reader036.vdokument.com/reader036/viewer/2022070217/61214f9734b3c1759b6e34f8/html5/thumbnails/2.jpg)
Maulidina 1113201201
METODOLOGI PENELITIANKAJIAN
PUSTAKA
PENDAHULUAN
![Page 3: ANALISA STRUKTUR BAWAH PERMUKAAN TANAH DI …repository.its.ac.id/51745/2/1113201201-Presentation.pdf•Gelombang VLF-EM •NA-MEMD •Filter Karous-Hjelt •Inversi •Finite Element](https://reader036.vdokument.com/reader036/viewer/2022070217/61214f9734b3c1759b6e34f8/html5/thumbnails/3.jpg)
Pendahuluan
FAKTA Penemuan Candi Gambar Wetanpertama kali di Desa Sumberasri, Kec.Nglegok, Kab. Blitar hanya satu arca Tahun-tahun berikutnya ditemukanarca dan bagian tempat pemujaan Penemuan terbaru Mei 2014 sebuaharca
Perlu penelitian lebih lanjut tentangstruktur bawah tanah sekitar CandiGambar Wetan
TEORI Batuan memiliki resistivitas lebih tinggidaripada tanahMetode VLF-EM dapat digunakan untukmengenali dengan cepat beda resistansi yangexist pada batuan beku dan sedimennya.
PENEITIAN TERDAHULU Arcone, 1978; Paal, 1968 (batuan induk) Drahor, 2006 (arkeologi)
RUMUSAN MASALAHBagaimana anomali dan hasil interpretasi pengukuranVLF-EM untuk sebaran batuan bawah tanah sekitarcandi?
![Page 4: ANALISA STRUKTUR BAWAH PERMUKAAN TANAH DI …repository.its.ac.id/51745/2/1113201201-Presentation.pdf•Gelombang VLF-EM •NA-MEMD •Filter Karous-Hjelt •Inversi •Finite Element](https://reader036.vdokument.com/reader036/viewer/2022070217/61214f9734b3c1759b6e34f8/html5/thumbnails/4.jpg)
• Mengidentifikasi anomali di bawah permukaan tanahdi sekitar candi berdasarkan hasil pengukuran VLF-EM
• Menentukan sebaran batuan bawah tanahberdasarkan hasil interpretasi pengukuran VLF-EM
Tujuan Penelitian
Maulidina 1113201201
![Page 5: ANALISA STRUKTUR BAWAH PERMUKAAN TANAH DI …repository.its.ac.id/51745/2/1113201201-Presentation.pdf•Gelombang VLF-EM •NA-MEMD •Filter Karous-Hjelt •Inversi •Finite Element](https://reader036.vdokument.com/reader036/viewer/2022070217/61214f9734b3c1759b6e34f8/html5/thumbnails/5.jpg)
Maulidina 1113201201
METODOLOGI PENELITIANKAJIAN
PUSTAKA
PENDAHULUAN
![Page 6: ANALISA STRUKTUR BAWAH PERMUKAAN TANAH DI …repository.its.ac.id/51745/2/1113201201-Presentation.pdf•Gelombang VLF-EM •NA-MEMD •Filter Karous-Hjelt •Inversi •Finite Element](https://reader036.vdokument.com/reader036/viewer/2022070217/61214f9734b3c1759b6e34f8/html5/thumbnails/6.jpg)
Maulidina 1113201201
Kajian Pustaka
• Gelombang VLF-EM • NA-MEMD • Filter Karous-Hjelt
• Inversi • Finite Element Method
• SifatElektromagnetikMaterial Arkeologi
![Page 7: ANALISA STRUKTUR BAWAH PERMUKAAN TANAH DI …repository.its.ac.id/51745/2/1113201201-Presentation.pdf•Gelombang VLF-EM •NA-MEMD •Filter Karous-Hjelt •Inversi •Finite Element](https://reader036.vdokument.com/reader036/viewer/2022070217/61214f9734b3c1759b6e34f8/html5/thumbnails/7.jpg)
Gelombang VLF-EM
Maulidina 1113201201
Pemancar
Sinyal VLF
PerambatanMedan EM
Fase dan Polarisasi Ellips
Skin Depth
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Pemancar
Maulidina
Gelombang VLF-EM
1113201201
Dua pemancar terdekat dengan Indonesia berada diYosamai, Jepang dan Northwest Cape, Australia
Ilustrasi transmitter raksasa VLF NLK di Seattle, US yang dibangun pada lembah dua bukit(Sumber: Panduan Workshop Ekplorasi Geofisika UGM, 2011)
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Gelombang VLF-EM
Maulidina 1113201201
Pemancar
Sinyal VLF
PerambatanMedan EM
Fase dan Polarisasi Ellips
Skin Depth
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Sinyal VLF
Maulidina
Gelombang VLF-EM
1113201201
bumi adalah bulat (sferis) bukan datar (flat) dan dikelilingi oleh ionosfer adanya noise dalam penerimaan sinyal
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Gelombang VLF-EM
Maulidina 1113201201
Pemancar
Sinyal VLF
PerambatanMedan EM
Fase dan Polarisasi Ellips
Skin Depth
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Perambatan Medan EM
Maulidina
Gelombang VLF-EM
1113201201
TE Mode
TM Mode
Output alat VLF berupa data triper (Hz/Hy) berbilangankomplek akibat polarisasi
Hz≠Hy
Hz=Hy
bentuk ellips
bentuk lingkaran
bagian real inphasebagian imaginer quadrature
Perbedaankonduktivitas Medan magnetik gel
primer menginduksimedium
Eddy Current
![Page 13: ANALISA STRUKTUR BAWAH PERMUKAAN TANAH DI …repository.its.ac.id/51745/2/1113201201-Presentation.pdf•Gelombang VLF-EM •NA-MEMD •Filter Karous-Hjelt •Inversi •Finite Element](https://reader036.vdokument.com/reader036/viewer/2022070217/61214f9734b3c1759b6e34f8/html5/thumbnails/13.jpg)
Eddy Current
Maulidina
Gelombang VLF-EM
1113201201
Arus Eddy menimbulkan medan elektromagnetik baru yang disebut medanelektromagnetik sekunder (Bosch dan Muler, 2001)
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Gelombang VLF-EM
Maulidina 1113201201
Pemancar
Sinyal VLF
PerambatanMedan EM
Fase dan Polarisasi Ellips
Skin Depth
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Fase dan Polarisasi Ellips
Maulidina
Gelombang VLF-EM
1113201201
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Gelombang VLF-EM
Maulidina 1113201201
Pemancar
Sinyal VLF
PerambatanMedan EM
Fase dan Polarisasi Ellips
Skin Depth
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Skin Depth
Maulidina
Gelombang VLF-EM
1113201201
Kedalaman penetrasi gelombang (Skin Depth) :
Skin Depth (m)
f (Hz)Resistivitas (Ωm)
0.01 1 102 104
0.01 500 5000 5x104 5x105
10 16 160 1600 16000
103 1.6 16 160 1600
104 0.5 5 50 500
105 0.16 1.6 16 160
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Maulidina 1113201201
Kajian Pustaka
• Gelombang VLF-EM • NA-MEMD • Filter Karous-Hjelt
• Inversi • Finite Element Method
• SifatElektromagnetikMaterial Arkeologi
![Page 19: ANALISA STRUKTUR BAWAH PERMUKAAN TANAH DI …repository.its.ac.id/51745/2/1113201201-Presentation.pdf•Gelombang VLF-EM •NA-MEMD •Filter Karous-Hjelt •Inversi •Finite Element](https://reader036.vdokument.com/reader036/viewer/2022070217/61214f9734b3c1759b6e34f8/html5/thumbnails/19.jpg)
Maulidina
NA-MEMD
1113201201
Contoh hasil penguraian sinyal
-4
-2
0
2
4
6
0 10 20 30 40 50
inphase
quadratureHasil penjumlahan IMF4 dan IMF5
![Page 20: ANALISA STRUKTUR BAWAH PERMUKAAN TANAH DI …repository.its.ac.id/51745/2/1113201201-Presentation.pdf•Gelombang VLF-EM •NA-MEMD •Filter Karous-Hjelt •Inversi •Finite Element](https://reader036.vdokument.com/reader036/viewer/2022070217/61214f9734b3c1759b6e34f8/html5/thumbnails/20.jpg)
Maulidina 1113201201
Kajian Pustaka
• Gelombang VLF-EM • NA-MEMD • Filter Karous-Hjelt
• Inversi • Finite Element Method
• SifatElektromagnetikMaterial Arkeologi
![Page 21: ANALISA STRUKTUR BAWAH PERMUKAAN TANAH DI …repository.its.ac.id/51745/2/1113201201-Presentation.pdf•Gelombang VLF-EM •NA-MEMD •Filter Karous-Hjelt •Inversi •Finite Element](https://reader036.vdokument.com/reader036/viewer/2022070217/61214f9734b3c1759b6e34f8/html5/thumbnails/21.jpg)
Maulidina
Filter Karous-Hjelt
1113201201
Contoh hasil pengolahan menggunakan Filter Karous Hjelt
Data Inphase
Data Quadrature
![Page 22: ANALISA STRUKTUR BAWAH PERMUKAAN TANAH DI …repository.its.ac.id/51745/2/1113201201-Presentation.pdf•Gelombang VLF-EM •NA-MEMD •Filter Karous-Hjelt •Inversi •Finite Element](https://reader036.vdokument.com/reader036/viewer/2022070217/61214f9734b3c1759b6e34f8/html5/thumbnails/22.jpg)
Maulidina 1113201201
Kajian Pustaka
• Gelombang VLF-EM • NA-MEMD • Filter Karous-Hjelt
• Inversi • Finite Element Method
• SifatElektromagnetikMaterial Arkeologi
![Page 23: ANALISA STRUKTUR BAWAH PERMUKAAN TANAH DI …repository.its.ac.id/51745/2/1113201201-Presentation.pdf•Gelombang VLF-EM •NA-MEMD •Filter Karous-Hjelt •Inversi •Finite Element](https://reader036.vdokument.com/reader036/viewer/2022070217/61214f9734b3c1759b6e34f8/html5/thumbnails/23.jpg)
Maulidina
Inversi
1113201201
Contoh hasil pengolahan inversi
![Page 24: ANALISA STRUKTUR BAWAH PERMUKAAN TANAH DI …repository.its.ac.id/51745/2/1113201201-Presentation.pdf•Gelombang VLF-EM •NA-MEMD •Filter Karous-Hjelt •Inversi •Finite Element](https://reader036.vdokument.com/reader036/viewer/2022070217/61214f9734b3c1759b6e34f8/html5/thumbnails/24.jpg)
Maulidina 1113201201
Kajian Pustaka
• Gelombang VLF-EM • NA-MEMD • Filter Karous-Hjelt
• Inversi • Finite Element Method
• SifatElektromagnetikMaterial Arkeologi
![Page 25: ANALISA STRUKTUR BAWAH PERMUKAAN TANAH DI …repository.its.ac.id/51745/2/1113201201-Presentation.pdf•Gelombang VLF-EM •NA-MEMD •Filter Karous-Hjelt •Inversi •Finite Element](https://reader036.vdokument.com/reader036/viewer/2022070217/61214f9734b3c1759b6e34f8/html5/thumbnails/25.jpg)
Maulidina
Finite Element Method (FEM)
1113201201
Grid untuk analisis Ex dengan menggunakan metode FEM
![Page 26: ANALISA STRUKTUR BAWAH PERMUKAAN TANAH DI …repository.its.ac.id/51745/2/1113201201-Presentation.pdf•Gelombang VLF-EM •NA-MEMD •Filter Karous-Hjelt •Inversi •Finite Element](https://reader036.vdokument.com/reader036/viewer/2022070217/61214f9734b3c1759b6e34f8/html5/thumbnails/26.jpg)
Maulidina 1113201201
Kajian Pustaka
• Gelombang VLF-EM • NA-MEMD • Filter Karous-Hjelt
• Inversi • Finite Element Method
• SifatElektromagnetikMaterial Arkeologi
![Page 27: ANALISA STRUKTUR BAWAH PERMUKAAN TANAH DI …repository.its.ac.id/51745/2/1113201201-Presentation.pdf•Gelombang VLF-EM •NA-MEMD •Filter Karous-Hjelt •Inversi •Finite Element](https://reader036.vdokument.com/reader036/viewer/2022070217/61214f9734b3c1759b6e34f8/html5/thumbnails/27.jpg)
Maulidina 1113201201
METODOLOGI PENELITIANKAJIAN
PUSTAKA
PENDAHULUAN
![Page 28: ANALISA STRUKTUR BAWAH PERMUKAAN TANAH DI …repository.its.ac.id/51745/2/1113201201-Presentation.pdf•Gelombang VLF-EM •NA-MEMD •Filter Karous-Hjelt •Inversi •Finite Element](https://reader036.vdokument.com/reader036/viewer/2022070217/61214f9734b3c1759b6e34f8/html5/thumbnails/28.jpg)
Maulidina 1113201201
Kondisi Geologi dan LokasiPenelitian
Perangkat Penelitian
Akusisi Data
Pengolahan, Interpretasi, danAnalisa Data
Metodologi Penelitian
![Page 29: ANALISA STRUKTUR BAWAH PERMUKAAN TANAH DI …repository.its.ac.id/51745/2/1113201201-Presentation.pdf•Gelombang VLF-EM •NA-MEMD •Filter Karous-Hjelt •Inversi •Finite Element](https://reader036.vdokument.com/reader036/viewer/2022070217/61214f9734b3c1759b6e34f8/html5/thumbnails/29.jpg)
Kondisi Geologi dan Lokasi Penelitian
Maulidina
Metodologi Penelitian
1113201201
Lokasi Penelitian
![Page 30: ANALISA STRUKTUR BAWAH PERMUKAAN TANAH DI …repository.its.ac.id/51745/2/1113201201-Presentation.pdf•Gelombang VLF-EM •NA-MEMD •Filter Karous-Hjelt •Inversi •Finite Element](https://reader036.vdokument.com/reader036/viewer/2022070217/61214f9734b3c1759b6e34f8/html5/thumbnails/30.jpg)
Maulidina 1113201201
Kondisi Geologi dan LokasiPenelitian
Perangkat Penelitian
Akusisi Data
Pengolahan, Interpretasi, danAnalisa Data
Metodologi Penelitian
![Page 31: ANALISA STRUKTUR BAWAH PERMUKAAN TANAH DI …repository.its.ac.id/51745/2/1113201201-Presentation.pdf•Gelombang VLF-EM •NA-MEMD •Filter Karous-Hjelt •Inversi •Finite Element](https://reader036.vdokument.com/reader036/viewer/2022070217/61214f9734b3c1759b6e34f8/html5/thumbnails/31.jpg)
Perangkat Penelitian
Maulidina
Metodologi Penelitian
1113201201
Peralatan :
Microsoft Excel
Matlab
Inv2DVLF-v1
Surfer 9
Software :
Roll meter
Tali rafia
Kamera
Alat Tulis VLF-EM Scintrex Kompas Geologi GPS
![Page 32: ANALISA STRUKTUR BAWAH PERMUKAAN TANAH DI …repository.its.ac.id/51745/2/1113201201-Presentation.pdf•Gelombang VLF-EM •NA-MEMD •Filter Karous-Hjelt •Inversi •Finite Element](https://reader036.vdokument.com/reader036/viewer/2022070217/61214f9734b3c1759b6e34f8/html5/thumbnails/32.jpg)
Maulidina 1113201201
Kondisi Geologi dan LokasiPenelitian
Perangkat Penelitian
Akusisi Data
Pengolahan, Interpretasi, danAnalisa Data
Metodologi Penelitian
![Page 33: ANALISA STRUKTUR BAWAH PERMUKAAN TANAH DI …repository.its.ac.id/51745/2/1113201201-Presentation.pdf•Gelombang VLF-EM •NA-MEMD •Filter Karous-Hjelt •Inversi •Finite Element](https://reader036.vdokument.com/reader036/viewer/2022070217/61214f9734b3c1759b6e34f8/html5/thumbnails/33.jpg)
Akusisi Data
Maulidina
Metodologi Penelitian
1113201201
0.5m
1 m
Line 1
Line 2
![Page 34: ANALISA STRUKTUR BAWAH PERMUKAAN TANAH DI …repository.its.ac.id/51745/2/1113201201-Presentation.pdf•Gelombang VLF-EM •NA-MEMD •Filter Karous-Hjelt •Inversi •Finite Element](https://reader036.vdokument.com/reader036/viewer/2022070217/61214f9734b3c1759b6e34f8/html5/thumbnails/34.jpg)
Maulidina 1113201201
Kondisi Geologi dan LokasiPenelitian
Perangkat Penelitian
Akusisi Data
Pengolahan, Interpretasi, danAnalisa Data
Metodologi Penelitian
![Page 35: ANALISA STRUKTUR BAWAH PERMUKAAN TANAH DI …repository.its.ac.id/51745/2/1113201201-Presentation.pdf•Gelombang VLF-EM •NA-MEMD •Filter Karous-Hjelt •Inversi •Finite Element](https://reader036.vdokument.com/reader036/viewer/2022070217/61214f9734b3c1759b6e34f8/html5/thumbnails/35.jpg)
Pengolahan, Interpretasi, dan Analisa Data
Maulidina
Metodologi Penelitian
1113201201
Data Lapangan
Filter NA-MEMD
InversiFilter Karous-Hjelt
Interpretasi Kualitatif Interpretasi Kuantiitatif
Interpretasi Keseluruhan
![Page 36: ANALISA STRUKTUR BAWAH PERMUKAAN TANAH DI …repository.its.ac.id/51745/2/1113201201-Presentation.pdf•Gelombang VLF-EM •NA-MEMD •Filter Karous-Hjelt •Inversi •Finite Element](https://reader036.vdokument.com/reader036/viewer/2022070217/61214f9734b3c1759b6e34f8/html5/thumbnails/36.jpg)
Maulidina 1113201201
METODOLOGI PENELITIANKAJIAN
PUSTAKA
PENDAHULUAN
![Page 37: ANALISA STRUKTUR BAWAH PERMUKAAN TANAH DI …repository.its.ac.id/51745/2/1113201201-Presentation.pdf•Gelombang VLF-EM •NA-MEMD •Filter Karous-Hjelt •Inversi •Finite Element](https://reader036.vdokument.com/reader036/viewer/2022070217/61214f9734b3c1759b6e34f8/html5/thumbnails/37.jpg)
Line 1
Maulidina
INTERPRETASI KESELURUHAN SPASI 0.5
1113201201
102030405060708090100110120130140150160170180
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Line 2
Maulidina
INTERPRETASI KESELURUHAN SPASI 0.5
1113201201
2030405060708090100110120130140150160170180190
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Line 3
Maulidina
INTERPRETASI KESELURUHAN SPASI 0.5
1113201201
30405060708090100110120130140150160170180190200210220
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Line 4
Maulidina
INTERPRETASI KESELURUHAN SPASI 0.5
1113201201
102030405060708090100110120130140150160170180190
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Line 5
Maulidina
INTERPRETASI KESELURUHAN SPASI 0.5
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10
20
30
40
50
60
70
80
90
100
110
120
130
140
150
160
170
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Line 6
Maulidina
INTERPRETASI KESELURUHAN SPASI 0.5
1113201201
102030405060708090100110120130140150160170180190200210220
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Line 7
Maulidina
INTERPRETASI KESELURUHAN SPASI 0.5
1113201201
2030405060708090100110120130140150160170180190
![Page 44: ANALISA STRUKTUR BAWAH PERMUKAAN TANAH DI …repository.its.ac.id/51745/2/1113201201-Presentation.pdf•Gelombang VLF-EM •NA-MEMD •Filter Karous-Hjelt •Inversi •Finite Element](https://reader036.vdokument.com/reader036/viewer/2022070217/61214f9734b3c1759b6e34f8/html5/thumbnails/44.jpg)
Line 8
Maulidina
INTERPRETASI KESELURUHAN SPASI 0.5
1113201201
102030405060708090100110120130140150160170180190200210
![Page 45: ANALISA STRUKTUR BAWAH PERMUKAAN TANAH DI …repository.its.ac.id/51745/2/1113201201-Presentation.pdf•Gelombang VLF-EM •NA-MEMD •Filter Karous-Hjelt •Inversi •Finite Element](https://reader036.vdokument.com/reader036/viewer/2022070217/61214f9734b3c1759b6e34f8/html5/thumbnails/45.jpg)
Line 9
Maulidina
INTERPRETASI KESELURUHAN SPASI 0.5
1113201201
102030405060708090100110120130140150160170180190200
![Page 46: ANALISA STRUKTUR BAWAH PERMUKAAN TANAH DI …repository.its.ac.id/51745/2/1113201201-Presentation.pdf•Gelombang VLF-EM •NA-MEMD •Filter Karous-Hjelt •Inversi •Finite Element](https://reader036.vdokument.com/reader036/viewer/2022070217/61214f9734b3c1759b6e34f8/html5/thumbnails/46.jpg)
Conclusion
Two Anomalies
Resistive
Conductive
120-220Ωm
1-60Ωm
andesite
wet clay
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Thank You