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Haryono, Arif
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Analisis Pola Tegasan untuk Menentukan Tipe Sesar Grindulu di Pacitan, Jawa Timur Haryono, Arif
GEOSAINS KUTAI BASIN Vol 5 No 2 (2022)
Publisher : Geophysics Study Program, Faculty of Mathematics and Natural Sciences, Mulawarman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/geofisunmul.v5i2.1033

Abstract

Sesar Grindulu merupakan salah satu sesar aktif di Kabupaten Pacitan yang aktivitasnya telah beberapa kali menyebabkan terjadinya gempabumi. Posisinya yang memanjang dengan arah timur laut – barat daya seakan membelah Kabupaten Pacitan menjadi dua bagian, hal ini membuat Sesar Grindulu menjadi ancaman serius bagi masyarakat Pacitan. Salah satu langkah mitigasi bencana yang bisa dilakukan adalah dengan mengidentifikasi karakteristik Sesar Grindulu untuk mendapatkan informasi sebanyak mungkin. Dalam penelitian ini, tipe Sesar Grindulu ditentukan berdasarkan analisis pola tegasan menggunakan software Win-Tensor. Data masukan berupa dip dan strike adalah data sekunder hasil penelitian sebelumnya. Hasil analisis pola tegasan menunjukkan bahwa tegasan maksimum (σ1) merupakan gaya kompresi dan tegasan minimumnya (σ3) adalah gaya regangan, dimana keduanya berarah horisontal. Sedangkan tegasan menengahnya (σ2) berarah vertikal. Pola tegasan tersebut menunjukkan bahwa Sesar Grindulu termasuk dalam jenis sesar geser mengiri. Sementara itu, hasil proyeksi stereografi memperlihatkan bahwa tegasan utamanya (σ1) berarah N17oE, sedangkan bidang sesarnya memiliki arah N60oE. Berdasarkan sistem sesar geser menurut konsep Moody dan Hill, Sesar Grindulu digolongkan ke dalam sesar geser orde pertama karena gaya kompresi terbesarnya menggerus pada sudut 43o.
Penentuan Kedalaman dan Sudut Kemiringan Sesar Grindulu di Pacitan Menggunakan Metode Crow Search Algorithm (CSA) pada Data Self-Potential (SP) Haryono, Arif; Agustin, Reni
Progressive Physics Journal Vol 4 No 1 (2023): Progressive Physics Journal
Publisher : Program Studi Fisika, Jurusan Fisika, FMIPA, Universitas Mulawarman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/ppj.v4i1.1141

Abstract

Self-Potential (SP) is a geophysical survey method that is relatively easy and inexpensive. Interpretation of SP data can be used for various purposes such as the detection of landslide-prone areas, exploration of various types of minerals, and identification of the parameters of a fault or crack. In this study, SP data acquisition was carried out in Tambakrejo Village, Pacitan District with a total of 102 measurement data which aims to determine the depth and dip of the Grindulu Fault. SP data acquired in the field needs to be corrected for reference, namely corrections caused by a displacement of the starting point of measurement. This data is then filtered to increase the signal-to-noise ratio (SNR) and sharpen the resulting anomalies. This filtering process is carried out using the ICEEMD (Improved Complete Ensemble Empirical Mode Decomposition) method which is a development of the EMD method. Furthermore, the SP data inversion process to obtain model parameters is carried out by utilizing the CSA (Crow Search Algorithm) method. Based on the anomaly model generated from the SP data inversion process, it can be concluded that the Grindulu Fault was identified at a distance of 803,8 meters from the starting point of measurement with depths ranging from 11,06 to 102,74 meters. Furthermore, based on distance, depth, and anomaly shape data, the dip value can be calculated. The calculation results show that the dip of the Grindulu Fault in the study area is 75.58o. Identification of the Grindulu Fault in the form of depth and dip is very important in efforts to model the fault comprehensively.
Kajian Nilai B-Value untuk Menganalisis Aktivitas Seismik di Wilayah Pulau Jawa, Bali dan Nusa Tenggara Barat Munir, Rahmiati; Nurahmah, Laila; Friesky, Vindhiyah; Imran, Muh; Haryono, Arif
GEOSAINS KUTAI BASIN Vol. 7 No. 2 (2024)
Publisher : Geophysics Study Program, Faculty of Mathematics and Natural Sciences, Mulawarman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/geofisunmul.v7i2.1436

Abstract

This study aims to analyze seismic activity in East Java, Bali, and West Nusa Tenggara (NTB) using the b-value parameter. Earthquake data from the USGS catalog (2000–2023) were analyzed using Zmap software. To facilitate the analysis of the spatial distribution of b-values and seismic activity patterns in the study area, the region was divided into three areas: Region 1 covers most of West Java and Central Java, Region 2 includes the southern part of Central Java and part of East Java, while Region 3 covers East Java, Bali, and West Nusa Tenggara (NTB). The analysis steps include separating the main earthquake data, determining the b-value, and spatial mapping. The results show that b-values range from 0.4 to 1.9, where lower values (0.4–1.13) reflect high stress accumulation that may lead to large earthquakes, such as in Lombok, NTB. Conversely, higher values (1.13–1.9) indicate low stress, as seen in Sumbawa and the Indian Ocean. This study concludes that the study area exhibits different seismic activity patterns, with NTB as a high-risk area compared to East Java and Bali, in line with the distribution of b-values.
Analisis Pola Seismisitas Berdasarkan Nilai B-Value di Wilayah Laut Flores Rosidi, Fachrul; Azisyarlina, Dwi; Wati, Lia Nurfitriana; Munir, Rahmiati; Haryono, Arif; Imran, Muh
GEOSAINS KUTAI BASIN Vol. 8 No. 1 (2025)
Publisher : Geophysics Study Program, Faculty of Mathematics and Natural Sciences, Mulawarman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/geofisunmul.v8i1.1478

Abstract

The Flores Sea, located within Indonesia's territorial waters, is an area with high volcanic and seismic activity due to its position within the Pacific Ring of Fire. The complex movement of tectonic plates frequently triggers earthquakes in this region. This study was conducted to analyze earthquake potential in three segments of the Flores Sea area based on b-value and to examine earthquake events with magnitudes ≥ 7.4 within the period from 2000 to 2023 using Matlab and Zmap applications. From the analysis, it was found that Segment 1 has a higher potential for major earthquakes due to its low b-value. Meanwhile, Segment 2 shows a b-value below 1.19, indicating a significant potential for major earthquakes. In contrast, Segment 3 exhibits a b-value above 1.11, suggesting a lower likelihood of large-scale earthquakes. However, significant earthquakes can still occur, such as the one in Lospalos in December 2021 with a magnitude of 7.6. This demonstrates that, despite lower risk based on b-value, major earthquakes remain possible. Overall, from 2000 to 2023 in the Flores Sea region, only two events were recorded with magnitudes exceeding ≥ 7.4: one in Segment 2 with a magnitude of 7.5 in 2005, and another in Segment 3 with a magnitude of 7.6 in 2021.
Co-Authors Agustin, Reni azisyarlina, Dwi Friesky, Vindhiyah Imran, Muh Munir, Rahmiati Nurahmah, Laila Rosidi, Fachrul wati, lia nurfitriana