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All Journal JLBG (Jurnal Lingkungan dan Bencana Geologi) (Journal of Environment and Geological Hazards) JGISE-Journal of Geospatial Information Science and Engineering
Bambang Sunardi
Puslitbang BMKG
Earth & Planetary Sciences Engineering Environmental Science

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Variasi Gas Radon dan Aktivitas Kegempaan di Sekitar Patahan Opak Bambang Sunardi
Jurnal Lingkungan dan Bencana Geologi Vol 9, No 1 (2018)
Publisher : Badan Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2498.195 KB) | DOI: 10.34126/jlbg.v9i1.166

Abstract

Monitoring gas radon di dalam tanah telah dilakukan secara kontinyu selama dua tahun terakhir di sekitar patahan Opak Yogyakarta sebagai salah satu upaya mitigasi bencana gempa. Penelitian ini bertujuan menganalisis variasi radon dan aktivitas kegempaan yang terjadi di sekitar patahan Opak serta mengeksplorasi munculnya prekursor untuk gempa lokal. Monitoring data radon dilakukan di dua lokasi yaitu di daerah Pundong dan Piyungan, sedangkan aktivitas gempa di sekitar patahan Opak diperoleh dari data repositori gempabumi BMKG.  Eksplorasi anomali radon untuk melihat adanya prekursor gempa dilakukan dengan menerapkan metode korelasi. Anomali radon ditetapkan apabila rasio simpangan koefisien korelasi (Sk) dengan deviasi standar (Ds) lebih kecil dari -1.  Hasil penelitian menunjukkan peningkatan emisi gas radon berkorelasi dengan kenaikan frekuensi kejadian gempa. Penerapan metode korelasi memperlihatkan beberapa anomali radon yang dapat diklasifikasikan sebagai prekursor gempa di sekitar patahan Opak. Penelitian lebih lanjut diperlukan untuk melihat konsistensi hasil monitoring anomali radon dengan kejadian gempa di sekitar patahan Opak.
Vs30 Mapping and Soil Classification in The Southern Part of Kulon Progo Using Rayleigh Wave Ellipticity Inversion Bambang Sunardi
Jurnal Geospasial Indonesia Vol 1, No 2 (2018): December
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jgise.39780

Abstract

Shear wave velocity from the ground surface to a depth of 30 meters (Vs30) is a parameter to determine dynamic characteristics of the soil, which can be used to assess the level of seismic hazard. Thus, Vs30 mapping has an important role in seismic hazard mitigation efforts. Vs30 can be determined by Multichannel Analysis of Surface Waves (MASW) and Spatial Autocorrelation (SPAC) methods. A simpler alternative can be done by using Rayleigh wave ellipticity. The main objective of this research is to map Vs30 in the southern part of Kulon Progo using Rayleigh wave ellipticity inversion. In this study, Rayleigh wave ellipticity inversion was performed on 42 microtremor single measurement data, scattered in the southern part of Kulon Progo. The inversion results are used to estimate the value of Vs30 and classify the soil type at the measurement points, referring to SNI 1726:2012. A Vs30 distribution map and soil type classification are obtained by applying the geostatistical interpolation method. The mapping result showed that most of the southern part of Kulon Progo has a relatively low Vs30 value. These values are in the range of 180-342 m/s, which categorized as stiff soil (SD). In this region, some parts located in the hilly and transition zones have relatively high shear wave velocities in the range of 357-578 m/s and included in the category of very dense soil/ soft rock (SC) types
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