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All Journal INDONESIAN JOURNAL OF APPLIED PHYSICS KURVATEK
nugroho budi wibowo
BMKG - Stasiun Geofisika Yogyakarta
Astronomy Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Materials Science & Nanotechnology Physics Social Sciences

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ANALISIS STRUKTUR BAWAH PERMUKAAN BERDASARKAN GROUND PROFILES Vs DI KECAMATAN PRAMBANAN DAN KECAMATAN GANTIWARNO KABUPATEN KLATEN nugroho budi wibowo
KURVATEK Vol 3 No 1 (2018): April 2018
Publisher : Institut Teknologi Nasional Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33579/krvtk.v3i1.734

Abstract

Penelitian ini bertujuan untuk menentukan nilai kecepatan gelombang geser dari pemodelan ground profiles menggunakan metode ellipticity curve, dan untuk menentukan struktur bawah permukaan. Akuisisi data mikrotremor dilakukan sebanyak 30 titik. Sinyal mikrotremor dianalisis menggunakan metode HVSR sehingga diperoleh data frekuensi predominan dan faktor amplifikasi yang disajikan dalam bentuk kurva H/V. Ground profile Vs diperoleh menggunakan metode ellipticity curve dengan input kurva H/V, Vs, Vp, density dan poisson ratio. Hasil penelitian menunjukkan bahwa struktur bawah permukaan di daerah penelitian terbagi menjadi tiga zona yang diklasifikasikan berdasarkan formasi pada lokasi penelitian, yaitu  zona I (Formasi Merapi Muda), zona II (Formasi Kebobutak)  dan zona III (Formasi Semilir). Nilai Vs pada zona I  bervariasi antara 50,15 m/s - 1657 m/s. Pada zona II nilai Vs bervariasi antara 50,75 m/s - 1555,08 m/s. Zona III memiliki nilai Vs bervariasi antara 52,09 m/s - 1744,5 m/s. Struktur bawah permukaan daerah penelitian didominasi oleh abu dan tuff yang tebal pada zona Formasi Merapi Muda. Konglomerat dan aglomerat pada zona Formasi Kebobutak. Lempung, dasit dan andesit pada zona Formasi Semilir. Analisa Struktur bawah permukaan memperlihatkan bahwa Kecamatan Prambanan dan Kecamatan Gantiwarno adalah wilayah yang mempunyai resiko bahaya seismik yang tinggi dikarenakan didominasi oleh material lunak.Kata kunci: ellipticity curve, ground profiles, kecepatan gelombang geser, struktur bawah permukaan
Analisis Seismisitas dan Energi Gempabumi di Kawasan Jalur Sesar Opak Oyo Yogyakarta Nugroho Budi Wibowo; Juwita Nur Sembri
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 7, No 2 (2017): October
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v7i2.13702

Abstract

The earthquake that occurred in the Region of Yogyakarta caused by fault activity on the surface, such as Opak-Oyo Fault, Dengkeng Fault, Menoreh Fault  and plate tectonic activity in South of Java. Opak-Oyo fault activity reflected from epicenter distribution and earthquake energy. This research aims to analyze the earthquake energy which has epicenter around the Opak-Oyo Fault in spatial and temporal. Based on earthquake catalog from 2008 – 2016, there were 66 earthquake with 11 significant event. Epicenter distribution reflected in seismicity map and for the tectonic parameter use least square method. Seismicity map of Opak Oyo Fault area show that distribution of epicenter in the East and Southeast of fault line with the calculation result of b value by least square method is 0.4. In temporal, there is an increasing trend of events in 2008-2015 and decline trend of earthquake in 2015- 2017. Earthquake energy that released in Opak Oyo Fault area has varies value about 1x105.2 – 1x1012joules. Meanwhile, the energy that associated with the existence of Opak Fault Lines has value between 1x105.2 – 1x109.6 Joule with 10-20 km of hypocenter.The distribution energy has similar pattern with geological formations in that area. 
Co-Authors Juwita Nur Sembri