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All Journal IJOG : Indonesian Journal on Geoscience JGE (Jurnal Geofisika Eksplorasi) Jurnal Geofisika Community Development Journal: Jurnal Pengabdian Masyarakat
Dicky Ahmad Zaky
Geophysical Engineering Department, Universitas Pertamina
Humanities Earth & Planetary Sciences Economics, Econometrics & Finance Education Energy Health Professions Physics Public Health

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 1 
Experimental Study of Spectral Induced Polarization Response Based on Laboratory Measurement Dicky Ahmad Zaky; Suparwoto Suparwoto
Jurnal Geofisika Vol 16 No 2 (2018): Jurnal Geofisika
Publisher : Himpunan Ahli Geofisika Indonesia (HAGI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36435/jgf.v16i2.374

Abstract

The spectral induced polarization (SIP) method can provide apparent complex resistivity based on measurements of multi frequency. SIP method also can provide more detail information about physical properties of rocks and minerals because SIP can give spectral parameters or Cole-Cole parameters such as, changeability (m), time constant (τ) and frequency dependence (c). An Experimental study in laboratory has been conducted to knowing the SIP response of some test sample. The measurement system is built with digital oscilloscope Pico ADC-100 as device for sampling the input and output voltage. Amplifier is used to doubled up the signal and input differential. The range frequency of measurement is 10−2 Hz - 103 Hz. Porouspot Cu − CuSO4 is used to minimize the polarization at potential electrode. A Matlab listings is used to calculate the response of impedance and phase. The result from calibration that used the parallel circuit RC indicate that the measurement system was good. SIP response of porous model indicate that the response form an asymptotic resistivity, and the peak of phase is in the range frequency where the dispersion happen. The result also indicate that resistivity of small grain size model is larger than the big grain size model. Result from sample of mineralized rocks did not indicate a perfect SIP response, it is influenced by the contact between mineral and water was minimum.
APPLICATION OF GENERALIZED DERIVATIVE OPERATOR ON BOUGUER ANOMALY FOR DETECTING GEOLOGICAL STRUCTURES Dicky Ahmad Zaky; Alissa Bilqis
JGE (Jurnal Geofisika Eksplorasi) Vol 8, No 2 (2022)
Publisher : Engineering Faculty Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jge.v8i2.204

Abstract

Generalized Derivative Operator (GDO) is one of the first-order derivative filters that could control the derivative’s direction by modifying the value of azimuth () and dip () parameters. This study aims to examine those GDO parameters on synthetic Bouguer anomaly and apply them to field data of the Silver Peak geothermal field to identify the geological structures. We use Python programs to conduct the GDO and other derivative operators such as horizontal gradient (HG), analytic signal amplitude (AS), as well Second Vertical Derivative (SVD) for comparison. The derivative operators are performed in the Fourier domain and spatial domain. The results from synthetic data show that GDO can amplify the response both on local and regional anomalies. Nevertheless, enhanced local and regional anomaly might be shown as the same maximum value of GDO. It appears that GDO disregard the influence of density contrast and depth variation of the anomalous body. Subsequently, anomaly enhancement of Silver Peak area shows that GDO anomaly concurred with geological map. GDO and SVD could amplify the response of geological structures such as intrusive granite, fault lineaments, and lithological contact, as well as the horst-graben structure, as mentioned in previous studies, that might be acting as fluid pathways for the Silver Peak geothermal system.
PELATIHAN TSUNAMI READY DESA CIKAKAK YANG SIAP DAN SIAGA BENCANA Madrinovella, Iktri; Lubis, M. Husni Mubarak; Suhardja, Sandy Kurniawan; Zaky, Dicky Ahmad; Herawati, Ida; Pranowo, Waskito; Widyanti, Sari; Misbahudin, Misbahudin; Vikaliana, Resista; Mulyasari, Farah; Iskandar, Yelita Anggiane
Community Development Journal : Jurnal Pengabdian Masyarakat Vol. 4 No. 6 (2023): Volume 4 Nomor 6 Tahun 2023
Publisher : Universitas Pahlawan Tuanku Tambusai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/cdj.v4i6.23240

Abstract

Desa Cikakak di Sukabumi, Jawa Barat merupakan salah satu wilayah yang rawan gempa bumi dan tsunami. Untuk meminimalisir dampak bencana kepada masyarakat desa, dibutuhkan upaya pelatihan yang disebut IOWave23 agar mereka siap dan siaga jika terjadi kedaruratan. Pelatihan semacam ini perlu dilakukan secara berkala sebagaimana arahan Intergovernmental Oceanographic Commission (IOC), The United Nations Educational, Scientific and Cultural Organization) UNESCO. Terakhir diadakan 3 tahun lalu pada 2020 maka pelatihan harus disegerakan mengingat waktu ideal antar pelatihan adalah 2 tahun. Berkaca dari sejumlah bencana serupa di berbagai wilayah rawan di Indonesia maka kegiatan Pengabdian kepada Masyarakat (PkM) kali ini menjadi sangat penting karena memiliki tujuan utama memberikan pemahaman dan latihan langsung di lapangan terkait hal-hal yang harus dikuasai oleh masyarakat di wilayah rawan jika gempa bumi disertai tsuanmi melanda. Masyarakat terdampak perlu memahami hal-hal yang harus dilakukan saat terjadi bencana begitu juga setelahnya. Kegiatan utama pada PkM ini adalah drilling bencana beserta tindakan kesiapsiagaannya yang melibatkan ahli dan praktisi berpengalaman dari berbagai instansi seperti BMKG dan BPBD daerah. Target yang ingin dicapai dari program pelatihan ini peningkatan pengetahuan masyarakat Desa Cikakak mengenai kebencanaan gempa bumi dan tsunami, dan kesiapsiagaan menghadapinya.
Shotwavemod: An Open Package For Acoustic 2D/3D Seismic Wavefield and Shot Acquisition Modeling Using the Pseudo Spectral Element and Finite Difference Methods Abdullah, Agus; Pranowo, Waskito; Ahmad Zaky, Dicky
Indonesian Journal on Geoscience Vol. 12 No. 1 (2025)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.12.1.75-87

Abstract

Shotwavemod is an open package for 2D/3D acoustic seismic wave simulation, using the Pseudo Spectral Element and Finite Difference Method. It can also be used for forward modeling of seismic reflection acquisition. The shotwavemod offers straightforward execution of the simulation process, yet customizable parameters. The algorithm was optimized using vectorization and parallel computation to speed up the computational time. The simulation results of the Pseudo Spectral Element Method was compared to the Finite Difference Method. It is observed that the Finite Difference Method resulted in ringing artifacts as a numerical dispersion, particularly for higher frequencies. Nevertheless, with higher computational cost, the Pseudo Spectral Element Method effectively handles this numerical dispersion issue. The shotwavemod was tested for a complex velocity model of the Marmousi. The results are quite promising, where shot gathers of seismic reflections are successfully established corresponding to the complex structure of the Marmousi. The shotwavemod is accessible to the public, and is a suitable tool for educational and research purposes involving seismic wave simulation.
An attempt to Model Final Reservoir at Mt. Merapi Using Receiver Function Auly, Muhammad Fariq Riesky; Zaky, Dicky Ahmad; Saputra, Ryandika; Suhardja, Sandy Kurniawan; Widiyantoro, Sri; Ramdhan, Mohammad 
Jurnal Geofisika Vol 21 No 1 (2023): Jurnal Geofisika
Publisher : Himpunan Ahli Geofisika Indonesia (HAGI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36435/jgf.v21i1.537

Abstract

Studi di daerah Gn. Merapi sudah banyak dilakukan sebelumnya untuk mengetahui kondisi di bawah permukaan pada area tersebut, khususnya untuk mengetahui mekanisme vulkanik dari Gn. Merapi itu sendiri. Hal yang sering menjadi topik pembahasan pada studi di Gn. Merapi adalah kondisi dari reservoir magma yang ada di bawah permukaan. Untuk memperkirakan hal tersebut dilakukan teknik receiver function dengan membuat model kecepatan sintetik yang kemudian diolah menjadi kurva synthetic receiver function. Hasil synthetic receiver function kemudian dikorelasikan dengan hasil receiver function observasi hingga didapatkan korelasi yang paling baik. Sebelum dilakukan pembuatan synthetic receiver function untuk mencitrakan kondisi bawah permukaan Gn. Merapi, perlu dilakukan terlebih dahulu analisis awal terhadap respon hasil receiver function dari model sederhana yang dibuat dengan memberikan sumber-sumber sinyal utama pada kurva receiver function yang dihasilkan agar mempermudah pembuatan model kecepatan sintetik. Sumber-sumber respon sinyal utama yang mempengaruhi bacaan receiver function di antaranya adalah kontras nilai kecepatan gelombang seismik terutama Vs, adanya lapisan sedimen yang memiliki ketebalan tipis, adanya zona berkecepatan rendah (low velocity zone) yang diinterpretasikan sebagai reservoir magma, dan kedalaman dari batas kerak dan mantel atas yaitu moho discontinuity. Berdasarkan hasil synthetic receiver function di stasiun ME25, ME32 dan ME36, didapatkan kedalaman dari moho berkisar antara 26-29 km dan semakin dangkal ke arah Gn. Merapi, yaitu arah selatan dari daerah studi. Kedalaman dari low velocity zone juga bervariasi yaitu berkisar antara 5-15 km dan juga semakin dangkal ke arah selatan.
Co-Authors Agus Abdullah Alissa Bilqis Auly, Muhammad Fariq Riesky Ida Herawati Iktri Madrinovella Iskandar, Yelita Anggiane Misbahudin Misbahudin Muhammad Lubis Mulyasari, Farah Ramdhan, Mohammad  Sandy Kurniawan Suhardja Saputra, Ryandika Sri Widiyantoro Suhardja, Sandy Kurniawan Suparwoto Suparwoto Vikaliana, Resista Waskito Pranowo Widyanti, Sari