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All Journal POSITRON Jurnal Fisika Unand Jurnal Penelitian Pendidikan IPA (JPPIPA) Jurnal Geofisika Journal of Technomaterial Physics
Titi Anggono
Research Center for Physics, Indonesian Institute of Sciences, Kawasan PUSPIPTEK Serpong, Tangerang 15310
Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Materials Science & Nanotechnology Physics

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Optimization of Band Pass Filter for Variance Reduction in Determining The Solution of Moment Tensor and Focusing Mechanism with ISOLA-GUI Sequence of The Minahasa Peninsula Earthquake Date 28 September 2018 to 1 October 2018 Anggono, Titi; Tarigan, Rio Rinaldo; Barus, Diana Alemin
Journal of Technomaterial Physics Vol. 3 No. 2 (2021): Journal of Technomaterial Physics
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jotp.v3i2.5558

Abstract

Sulawesi is one of the islands in Indonesia with a high level of seismicity because there are many active faults, especially in the Minahasa Peninsula area. This study discusses the moment tensor solution and the focus mechanism in the Minahasa Peninsula region from 28 September 2018 to 1 October 2018 using the ISOLA-GUI program. This program is used to process seismic data from the three components recorded by the seismogram. The data used in this study were five earthquake events consisting of earthquake foreshock, earthquake mainshock, and earthquake aftershock. With the ISOLA program, data processing is carried out which includes: crustal models, event info, selecting earthquake recording stations, preparing raw data for defining seismic sources, calculating green functions with computations, performing inversions and plotting results. In the inversion, the frequency of the band pass filter is selected to obtain the optimal reduction variance. After processing, calculating and interpreting the plot results, a fault model is obtained for each earthquake event, namely strike-slip. 
Relokasi Hiposenter Double Difference dan Penentuan Model Kecepatan di Jawa Bagian Barat Tahun 2010 "“ 2024 untuk Identifikasi Patahan S, Novita Sari; Rosid, Mohammad Syamsu; Anggono, Titi
POSITRON Vol 15, No 1 (2025): Vol. 15 No. 1 Edition
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam, Univetsitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/positron.v15i1.91097

Abstract

Jawa bagian barat adalah daerah dengan seismisitas tinggi dipengaruhi zona subduksi dua lempeng tektonik dan keberadaan sesar aktif yang beberapa diantaranya belum terpetakan oleh PuSGeN. Penelitian ini bertujuan untuk menentukan keberadaan sesar lokal menggunakan lokasi hiposenter yang lebih akurat. Data waktu tiba gelombang P dan S diperoleh dari hasil rekaman 38 stasiun seismik BMKG periode Januari 2010 "“ Januari 2024. Terhadap 1978 events gempa bumi kerak dangkal (kedalaman ≤50 km) telah dilakukan relokasi hiposenter double difference dan model kecepatan seismik yang diperbarui. Model kecepatan yang didapat menunjukkan nilai RMS sebesar 0,52. Relokasi double difference berhasil merelokasi 1805 gempa bumi yang terjadi di Jawa bagian barat. Hasil relokasi merepresentasikan pola patahan pada kedalaman 5-20 km yang berhubungan dengan aktivitas sesar aktif lokal yang belum terpetakan dan sesar regional seperti Sesar Cimandiri, Sesar Lembang, Sesar Baribis, dan Sesar Garsela. Relokasi berhasil memetakan patahan yang belum terpetakan oleh PuSGeN seperti Sesar Citarik dan Sesar Cipamingkis dengan strike timur laut "“ barat daya dan kemiringan dip nya berturut-turut ~85 ° dan ~80 ° ke arah barat laut, serta sesar penyebab gempa bumi Cianjur dengan arah strike barat laut "“ tenggara dan sudut dip ~80 ° ke arah timur laut. Sedangkan dua sesar lainnya yang telah terpetakan yaitu Sesar Cimandiri dengan arah strike barat "“ timur, Sesar Garsela Rakutai dan Sesar Garsela Kencana mempunyai arah strike yang sama timur laut "“ barat daya dengan kemiringan dip ~60 ° ke arah tenggara.
Karakteristik Atenuasi Gelombang Seismik di Daerah Ternate, Maluku Utara dengan menggunakan Analisis Gelombang Coda Satriani, Fatima Marjan Keshia; Anggono, Titi; Hasanah, Mia Uswatun
Jurnal Geofisika Vol 23 No 1 (2025): Jurnal Geofisika
Publisher : Himpunan Ahli Geofisika Indonesia (HAGI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36435/jgf.v23i1.660

Abstract

The convergence of the Philippine Plate, the Eurasian Plate, the Australian Plate, and the double subduction between the Molucca Sea Plate, the Sangihe Through, and the Halmahera Through have created a complex tectonic setting in North Maluku. Due to intense tectonic activity, this region frequently experiences the possibility of tectonic events like earthquakes. In the attenuation seismology approach, seismic waves propagating below the surface are measured for amplitude amplification and attenuation. Seismic wave attenuation propagating in this region is described using the coda attenuation method on coda seismic waves. In order to determine the degree of tectonic activity in the Ternate region, 129 earthquake data points from four sites in North Maluku that were less than 40 kilometers deep were processed. Stations SP01 and SP02 are situated on Ternate Island, whereas stations BB06 and SP28 are situated on Hiri Island. A sampling frequency of 2 – 10 Hz and a window length of 20 – 120 s were used to get values of the coda (Q0), η, Qc, and attenuation (Qc-1). Twi times the S-wave’s arrival time is assumed for the coda wave. The coda variation values (Q0) were recorded as follows: an average of 112. 167 for station SP01, 91.071 for station SP02, 116.089 for station SP28, and 112.843 for station BB06. The value increases and decreases within the 20 – 40 s range. The values of attenuation and (Q0) are inversely related. The Q0 and Qc values obtained are low due to the high damping value in the Ternate area. The high damping (Qc-1), high eta (η) value (>1), and low Q0 value (<200) are thought to be signs of strong tectonic activity in the Ternate, Halmahera, North Maluku region.
Studi Bahaya Seismik dengan Metode Probabilistic Seismic Hazard Analysis di Sumatera Barat Daswita, Alifvia; Pujiastuti, Dwi; Anggono, Titi
Jurnal Fisika Unand Vol 12 No 3 (2023)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.12.3.444-450.2023

Abstract

Telah dilakukan penelitian bahaya seismik untuk mengetahui nilai percepatan tanah maksimum atau Peak Ground Acceleration (PGA) dan tingkat bahaya seismik di Sumatera Barat menggunakan metode probabilistic seismic hazard analysis (PSHA). Data gempa bumi berasal dari katalog ISC, USGS dan GCMT dalam rentang 1972-2022. Nilai PGA dicari menggunakan fungsi atenuasi dengan probabilitas terlampauinya 10% dan 2% dalam 50 tahun. Hasil penelitian menunjukkan PGA maksimum untuk probabilitas terlampauinya 10%  dan 2% dalam 50 tahun adalah 1,2 gal dan 1,94 gal. Wilayah dengan tingkat bahaya seismik tinggi berada di Kabupaten Mentawai dengan nilai PGA 0,8-0,95 gal dan 1,35-1,54 gal pada probabilitas terlampauinya 10% dan 2% dalam 50 tahun. Wilayah dengan tingkat bahaya seismik sedang sampai tinggi berada di wilayah Bukit Barisan diantaranya Kota Padang, Kota Pariaman dan Kota Bukitinggi dengan PGA 0,39-0,75 gal dan 0,65-1,33 gal pada probabilitas terlampauinya 10% dan 2% dalam 50 tahun. Wilayah dengan tingkat bahaya seismik rendah sampai sedang berada di belakang Bukit Barisan seperti Kabupaten Dharmasraya, Kabupaten Sijunjung dan Kota Payakumbuh dengan PGA <0,4 gal. Berdasarkan nilai PGA maka didapatkan bahwa Sumatera Barat memiliki tingkat bahaya seismik sedang sampai tinggi secara keseluruhan dan tinggi pada daerah Siberut dan Pagai Selatan karena berada pada zona megathrust dan sesar Mentawai.
Penentuan Model Kecepatan Seismik 1-D di Pulau Lombok Bunaga, I Gusti Ketut Satria; Rosid, Mohammad Syamsu; Anggono, Titi; Septiadhi, Ardhianto
Jurnal Penelitian Pendidikan IPA Vol 9 No 12 (2023): December
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v9i11.6023

Abstract

The interpretation of local geology structure can be done effectively by using an appropriate local seismic velocity model. It is suitable to implement in Lombok Island that the local fault activity near Mount Rinjani caused the 2019 East Lombok Earthquake. This study determines and updates the 1-D seismic velocity model using the VELEST by applying the Coupled Hypocenter-Velocity method. The 2010-2022 earthquake data from the catalog of BMKG is used for this study. A total of about 166 events (M ≥ 4) and 20 seismic stations in Lombok and surrounding areas are utilized in this study. The local model (Koulakov) and global (AK-135) are selected as the initial model. The double-difference method is also used to test both velocity models refining the hypocenter location. The results show that the updated Koulakov model has a high relevance in representing the crustal structure of Lombok Island according to the parameters of RMS value, uncertainties hypocenter, and seismic interpretation. It demonstrates not only the local geology condition but also a more reliable seismic velocity model in the region of Lombok Island. This model can be used as a reference for interpreting the better geological structure.
Karakteristik Atenuasi Seismik di Pulau Sumba Berdasarkan Analisis Gelombang Coda Ariyanti, Ayu Puput; Anggono, Titi; Prasetio, Aditya Dwi; Kirana, Kartika Hajar
Jurnal Penelitian Pendidikan IPA Vol 11 No 4 (2025): April
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v11i4.10870

Abstract

Coda wave data from four stations are to understand seismic attenuation on Sumba Island. Specifically, we estimate the quality factor at 1 Hz (Q₀) and its frequency dependence (η) across multiple window lengths (20–120 s) and frequency bands (1–7 Hz) using waveform data from 394 local earthquakes. The aim is to evaluate how these parameters reflect crustal heterogeneity and tectonic activity. Results show that Q₀ increases with window length, indicating that coda waves progressively sample deeper and more homogeneous layers, while high η values at shorter windows suggest significant near-surface heterogeneity. These findings highlight a depth-dependent variation in seismic attenuation and structural complexity. The study reveals spatial variability, with MELO station showing anomalously high Q₀ values, likely due to localized site conditions or deeper structural influences. Sumba’s location within the tectonically active Sunda-Banda arc transition zone further supports these observations. The combination of low Q₀ and high η values confirms high tectonic activity, and the use of coda wave attenuation analysis offers a reliable, parameter-based framework for assessing seismic hazard potential in regions with complex geodynamics. This work fills a research gap by providing empirical data and interpretation for a previously underexplored area in eastern Indonesia.
Co-Authors Aditya Dwi Prasetio, Aditya Dwi Ariyanti, Ayu Puput Daswita, Alifvia Diana Alemin Barus, Diana Alemin Dwi Pujiastuti I Gusti Ketut Satria Bunaga, I Gusti Ketut Satria Kartika Hajar Kirana, Kartika Hajar Mia Uswatun Hasanah Rosid, Mohammad Syamsu S, Novita Sari Satriani, Fatima Marjan Keshia Septiadhi, Ardhianto Tarigan, Rio Rinaldo