Setyoajie Prayoedhie
Badan Meteorologi Klimatologi dan Geofisika (BMKG)

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Studi Awal Mikrozonasi dan Klasifikasi Site Wilayah Jakarta Selatan Rifa Salma Salsabila; Bambang Sunardi; Setyoajie Prayoedhie
Jurnal Stasiun Geofisika Sleman Vol. 1 No. 1 (2023): Jurnal Stasiun Geofisika Sleman (JSGS)
Publisher : Stasiun Geofisika Kelas I Sleman

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Abstract

Microzonation mapping is very necessary in the south Jakarta area because the effects of earthquakes are often felt. This region also has a very high population density. Microzonation is needed to reduce the risk if an earthquake occurs. Another effort to support earthquake microzonation is by conducting site classification. One of the data that can be used is microtremors which are then processed using the Horizontal to Vertical Spectral Ratio (HVSR) method. Furthermore, the HVSR inversion process can be used to obtain the value of the shear wave velocity (Vs). In this research, the creation of a microzonation map includes a dominant frequency map, amplification factor, seismic vulnerability index, and site classification map. The research results show that in the South Jakarta area, especially the Pesangrahan, Kebayoran Lama, Kebayoran Baru, Setiabudi and Tebet districts, the dominant frequency (fo) is relatively low, the amplification factor is relatively high, and the dominant site is classified as medium soil (SD). Based on this, in general the South Jakarta area has a relatively high risk of earthquakes.
Penentuan Aftershock Gempabumi Yogyakarta Tanggal 6 Juni 2006 Dengan Menggunakan Metode Geiger Dinda Shakila Farah; Setyoajie Prayoedhie; Budiarta Budiarta; Dini Vermiratih; Yusuf Hadi Perdana
Jurnal Stasiun Geofisika Sleman Vol. 1 No. 1 (2023): Jurnal Stasiun Geofisika Sleman (JSGS)
Publisher : Stasiun Geofisika Kelas I Sleman

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Abstract

The 2006 Yogyakarta earthquake was a shallow crustal tectonic earthquake that rocked the Special Region of Yogyakarta (DIY) and its surroundings on May 27, 2006. This earthquake was followed by many aftershocks up to 10 days later, namely on June 6, 2006. To get information about the distribution aftershock of earthquake, aftershock parameter processing was carried out on June 6, 2006. Determination of the aftershock parameters was carried out using SeisComp3 software with the principles and theory of the Geiger method. The Geiger method is a method that uses least squares optimization to determine the hypocenter and epicenter points. There were 122 earthquakes that occurred on June 6, 2006 with earthquake magnitudes ranging from 0.8 – 3.7 and occurring at depths of 1.5 km – 18.6 km. Aftershock aftershocks spread along the border of Bantul and Gunungkidul Regencies, due to the Opak fault and the many minor faults around the Opak fault. This causes the Bantul and Gunungkidul Regency areas to be very active in terms of seismicity.