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Bambang Sunardi, Bambang
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Pemanfaatan Fatiando a Terra untuk Analisis Data Gravitasi GGMplus berbasis Pustaka Python Amelia, Tri; Sunardi, Bambang; Mardiyanto; Prayoedhie, Setyoajie
Jurnal Stasiun Geofisika Sleman Vol. 1 No. 2 (2023): Jurnal Stasiun Geofisika Sleman (JSGS)
Publisher : Stasiun Geofisika Kelas I Sleman

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Abstract

The gravity method is one of the methods that can be used for regional geological studies according to differences in rock density due to variations in the Earth's gravitational field. Gravity data is not limited to field data but can also use satellite data such as GGMplus. The interpretation of gravity data in this paper is based on the results of regional anomalies and residual anomalies in the research area. Initially, the data was processed using the python verde, harmonica, boule, and pooch libraries by Fatiando a terra. The results of processing GGMplus gravity data using the python library by Fatiando a Terra indicate regional anomaly values ranging from 60 mGal to 130 mGal whereas the residual anomaly is between -30 mGal to 30 mGal. Synchronization between the position of positive and negative values of the residual anomaly and the fault coordinates coincide so that the faults in the Special Region of Yogyakarta are identified.
IDENTIFIKASI ZONA BAHAYA GEMPA BUMI BERDASARKAN PERCEPATAN TANAH MAKSIMUM DI KOTA SEMARANG Koesuma, Sorja; Fajrin, Viola; Sunardi, Bambang
Indonesian Journal of Environment and Disaster Vol. 1 No. 2 (2022): Indonesian Journal of Environment and Disaster
Publisher : Disaster Research Center, Universitas Sebelas Maret, Surakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/ijed.v1i2.428

Abstract

Semarang City as the Capital of Central Java Province requires an earthquake-prone map. It is required since there are two active faults in Semarang, namely the Semarang fault (part of the Baribis - Kendeng fault) and the Ungaran fault. Moreover, Semarang City is composed of alluvial layers that can accelerate earthquake waves. This study aims to determine site class, peak ground acceleration (PGA) in bedrock, PGA at ground level and earthquake hazard index in Semarang City. In this study, the calculation of peak ground acceleration uses the method in SNI 1726: 2019, while the earthquake hazard index refers to the JICA classification. As input data in the form of the peak ground acceleration value in bedrock, the average shear wave velocity to a depth of 30 meters (Vs30) to determine the site class, as well as the value of the amplification factor. The calculation results in almost all areas of Semarang City have a high earthquake hazard index and only Genuk sub-district has a moderate hazard index. The main determinants of peak ground acceleration at the surface are the source of the earthquake and the rock type
Co-Authors Abdul Basid Al Ghifari, Muhammad Taufiq Akbar Amelia, Tri Cahyo Nugroho, Cahyo Darmawan, Herlan Fajrin, Viola Ginting, Rika Adelina Handayani, Meila Prati Ilham Ilham Irayani, Zahroh Istiqomah, Melinda Utami Kalyana Mita, Ailing Kartiko, Ilham Bayu Koesuma, Sorja Marbun, Yorgita Naully Mardiyanto Marzuki Marzuki Nursarifa, Saskia Perdana, Yusuf Hadi Prayoedhie, Setyoajie Setyoajie Prayoedhie, Setyoajie Sihombing, Sulpisius Sudarmaji Suhayat Minardi Sulastri Sulastri Supriyanto Rohadi, Supriyanto Susanti, Dwi Budi Wuri Handayani Zawawi, Aditya Fais