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All Journal Natural B INDONESIAN JOURNAL OF APPLIED PHYSICS
Adi Susilo
Jurusan Fisika, Fakultas MIPA, Universitas Brawijaya, Malang
Astronomy Energy Environmental Science Materials Science & Nanotechnology Physics

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Determination of Internal Structure of Semeru Volcano Based on Seismic Attenuation Imagery Hena Dian Ayu; Adi Susilo; Sukir Maryanto; Muhamad Hendrasto
Natural B, Journal of Health and Environmental Sciences Vol 2, No 2 (2013)
Publisher : Natural B, Journal of Health and Environmental Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1429.936 KB) | DOI: 10.21776/ub.natural-b.2013.002.02.8

Abstract

Characteristic of medium could be defined by physical parameters such as seismic velocity and attenuation. Amplitude, hyocentral distance, frequency and attenuation coefficient is required to determine the Q-factor value  or attenuation in effort on imaging the internal structure. In this study, we used volcanic earthquakes data of Semeru Volcano recorded 2009 that consist 54 seismogram (24 A-type volcanic earthquakes and 24 explosion volcanic earthquakes. The Q-factor value of A-type volcanic earthquakes is 4 - 392 or about 78,87 and the Q-factor value of explosion volcanic earthquakes is 4 - 288 or about 51,39. In term of the image quality, it can be seen that the attenuation on Jongring Seloko active caldera and under Jongring Seloko have low attenuation value or high Q-factor value thas was called the zone beneath. The zone beneath is interpreted to associated with hot material that may indicate the magma chamber that  concentrated in the depth interval of 1-1,8 km from the top of Semeru Volcano. The zone beneath have structural trends on West-East-Southeastern-South sector out the volcano. The internal structure of Semeru Volcano is predominance of sedimentary rocks, sandstone and rocks with gas in pore space. Although in some deep layer have internal structure as metamorphic rocks and igneous rock.
Identification of Cracked Zone in Sutami dam Using Geoelectrical Method Fina Fitriah; Sunaryo S; Adi Susilo
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 5, No 02 (2015): IJAP Volume 05 Issue 02 Year 2015
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v5i02.294

Abstract

We identified the craked zones based on geoelectrical resistivity method in Sutami Dam. There are four lines measurement of geoelectrical resistivity method with a length of 380-400 meters. The direction of each line is from the northeast to the southwest. All of the tracks are located at the top of Sutami Dam i.e. two tracks in the upstream and the others in the downstream. From the analysis we found that the lithology is detected by geoelectrical resistivty method showed two layers of design of Sutami Dam. The two layers that are detected are transition zone and filter zone. Transition zone consists of sandstone rock containing water (0.922 Ωm-9.57 Ωm) and dry sandstone (>9.57 Ωm-320 Ωm). Filter zone consists of sand (>320 Ωm-4410 Ωm). Cracked zones spread in the upstream, downstream, and roadway at the top of Sutami Dam which are indicated by the presence of low resistivity (0.922 Ωm-9.57 Ωm) based on 3D processing of data of geoelectrical resistivity. The distribution of cracked zone indicates that Sutami Dam is susceptible to ground movement.
Co-Authors Fina Fitriah Hena Dian Ayu Muhamad Hendrasto Sukir Maryanto Sunaryo Sunaryo