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All Journal Jurnal Meteorologi dan Geofisika Jurnal Geosaintek
Mz, Nasri
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Earth & Planetary Sciences Energy Physics

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STUDI AWAL SEISMOTEKTONIK DI WILAYAH JAWA BARAT BERDASARKAN RELOKASI HIPOSENTER METODE DOUBLE DIFFERENCE Kusmita, Tri; Pribadi, Ilham; MZ, Nasri
Jurnal Geosaintek Vol. 6 No. 1 (2020)
Publisher : Institut Teknologi Sepuluh Nopember

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Abstract

Jawa barat mempunyai aktivitas kegempaan yang sangat tinggi. Aktivitas kegempaan di wilayah Jawa Barat dikontrol oleh struktur geologi regional dan keberadaan sesar-sesar lokal. Aktivitas sesar-sesar lokal dan zona keberadaan zona subduksi dapat dipelajari dari sebaran hiposenter pada daerah tersebut. Sebaran hiposenter yang diperoleh dari katalog BMKG biasanya berasal dari quick count dengan mengabaikan beberapa parameter. Oleh karena itu, lokasi hiposenter tersebut harus direlokasi untuk menentukan hubungan hiposenter gempa dengan aktivitas tektonik daerah tersebut. Metode relokasi hiposenter yang digunakan adalah metode Double Difference. Metode ini digunakan untuk mengidentifikasi zona patahan berdasarkan distribusi gempa yang terjadi. Prinsip metode Double Difference adalah jarak persebaran hiposenter antara dua gempabumi sangat kecil dibandingkan dengan jarak antara stasiun gempabumi, maka raypath dan waveform kedua gempabumi dapat dianggap mendekati sama. Data yang digunakan dalam penelitian ini adalah data gempabumi yang terjadi pada periode Juli 2017-Juni 2018 di Jawa Barat. Hasil relokasi hiposenter menunjukkan bahwa kegempaan di Jawa Barat Sebagian besar berasosiasi dengan zona subduksi. Penunjaman yang terjadi relatif landai. Kedalaman aktivitas gempabumi pada zona subduksi tersebut sekitar 0-70 km. Aktifitas kegempaan pada Sesar-sesar lokal relatif sangat dangkal dan tersebar hampir di setiap segmen sesar lokal.
KARAKTERISASI RESERVOIR KARBONAT MENGGUNAKAN INVERSI IMPEDANSI AKUSTIK BLOK ‘X’, FORMASI TUBAN, CEKUNGAN JAWA TIMUR Juventa, Juventa; Bobbybuana, Ahmad Fakhri; MZ, Nasri; Herawan, Fitriyanda; Fatahillah, Ahmad Dzikra
Jurnal Geosaintek Vol. 8 No. 1 (2022)
Publisher : Institut Teknologi Sepuluh Nopember

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Carbonate reservoirs are usually difficult to map and identify in seismic sections due to their complex structure and diagenetic material with high heterogeneity. The East Java Basin is a perfect example of these complex carbonate structures with excellent hydrocarbon accumulation. In order to obtain a better characterization of the carbonate reservoir in this basin, acoustic impedance inversion is performed in here. Acoustic impedance is a product of seismic P wave velocity and density, where velocity and density are properties commonly used to describe rocks in a reservoir. Based on the sensitivity analysis results, the sensitive parameters to describe the reservoir are acoustic impedance, porosity, sonic, and density. Inversion results showed the range of acoustic impedance values in the Tuban Formation between 23000 – 50000 (ft/s).(g/cc) and porosity transformation results showed a value range of 8 – 22%. Depth structure map, acoustic impedance and porosity section slices showed the distribution pattern of reservoir zones lying in the West - Southwest direction with high structural elevations or located on the top structure reservoir carbonate at a depth of 2500 meters below the surface
ANALISIS KECEPATAN GELOMBANG GESER (Vs) MENGGUNAKAN MULTICHANNEL ANALYSIS OF SURFACE WAVE (MASW) DI KECAMATAN JAMBI LUAR KOTA Musyarofah, Leni Nurli; Resta, Ichy Lucya; MZ, Nasri
Jurnal Meteorologi dan Geofisika Vol. 25 No. 1 (2024)
Publisher : Pusat Penelitian dan Pengembangan BMKG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31172/jmg.v25i1.872

Abstract

Jambi Luar Kota is one of the sub-districts with an increasing population density and development level. It can be seen in the last 10 years (2010-2020), 39 populations/km2 with a total population of 62,687 people. The increase in population density impacts infrastructure development, which also increases. The site class maps need to be considered for infrastructure development by considering the development rules in accordance with SNI 1726:2019. This study used the Multichannel Analysis of Surface Wave (MASW) method, which measures variations in surface wave velocity with 21 lines. The average value of the shear wave velocity at a depth of 30 m MASW measurements ranged from 153.24 m/s - 420.86 m/s, consisting of SC site class, SD site class, and SE site class.  SC site class with a Vs30 value of 358.88 m/s-420.86 m/s was found on the east side of the middle part of the Jambi Luar Kota Sub-district. Meanwhile, the SD site classes are evenly distributed in the Jambi luar Kota Sub-district.  The SE site class is located on the north and east sides of the Jambi Luar Kota Sub-district with a Vs30 value of 153.24 m/s, which in this case is supported by geotechnical data in the form of water content (w) (43.03%), plasticity index (PI) (23.26) and a shear strength test of 17,652 kPa.  The area with a low Vs30 value (<175 m/s) is an area that has the potential to get relatively more significant shocks when ground movement occurs.
Co-Authors Bobbybuana, Ahmad Fakhri Fatahillah, Ahmad Dzikra fitri, Oktaviani Elsa Frastica Deswardani Herawan, Fitriyanda Juventa, Juventa Musyarofah, Leni Nurli Pribadi, Ilham Resta, Ichy Lucya Tri Kusmita