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Hypocenter dimension of 7.5 mw Palu earthquake using fractal approach

IOP Conference Series: Earth and Environmental Science 2020年第1期575卷

作者： Syamsurijal Rasimeng Alimuddin Rustadi Rudy Z. Sinambela Idris Mandang Samsul Bakri Ahmad Zaenudin Department of Geophysical Engineering Faculty of Engineering University of Lampung Indonesia Disaster and Mitigation Center Faculty of Engineering University of Lampung Indonesia Study Program of Geophysics Faculty of Mathematics and Natural Science Mulawarman University Indonesia Department of Forestry and The Graduate Program of Environmental Sciences University of Lampung Indonesia

Research on the Palu earthquake in the period of August to October 2018 has been carried out in the Palu Koro Fault (PKF) zone with a hypocenter of 5-20 km. This study aims to determine the fractal dimensions of these earthquakes based on the relationship between logarithmic frequency and earthquake magnitude correlation introduced by Gutenberg-Richter. Statistical correlation between logarithmic frequency and earthquake magnitude was calculated using the inversion approach. Based on the calculation results obtained fractal dimension value of 1.0378, which describes the seismicity pattern at a depth of 5-20 km. It indicates that the earthquakes triggered by the movement in rupture segments which seen as points along the PKF zone.

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Reservoir Characterization using Simultaneous Inversion for Identifying the Sandstone Reservoir of Air Benakat Formation 'IDY' Field in South Sumatra Basin

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IOP Conference Series: Materials Science and engineering 2019年第7期546卷

作者： I D Yuliandari A M Juwono Said Sabbeq Study Program of Engineering Geophysics Department of Physics FMIPA Brawijaya University PT Pertamina UTC

Abstract. This research was conducted using simultaneous inversion seismic method. The inversion method can be used not only to identify reservoirs, but to identify the fluid content in a rock formation. Formation in this study is Air Benakat Formation, in the South Sumatra Basin. Simultaneous inversion has the results in the form of P-impedance, S-impedance, density, P-wave velocity, S-wave velocity, and νp /νs . From the data that have been obtained, that IDY-1 well is considered as a gas saturated sandstone reservoir. Fluid Replacement Modeling (FRM) was also used, in this study, to obtain the detailed information about the presence of gas in the Air Benakat Formation. FRM can simulate the state of the formation if it were in an in situ case condition, and in the gas case condition. From the results of FRM processing, that is for the gas case condition of 90%, it was obtained the νp /νs value of 1.75 to 1.875. While, in the in situ case condition, the ratio was obtained to be 2.0 to 2.2. Based on simultaneous inversion results, the research area is known to have a P-impedance value of 5800 to 6000 (m / s) * (g / cc), an S-impedance of 2000 to 4000 (m / s) * (g / cc), the density of 2.2 to 2.27 g/g/cm3 and the νp /νs ratio of 2.17 to 2.25. To identify the distribution of sandstone reservoirs, a horizontal cross-section map was made, which produced results of the cross section of low impedance and low νp /νs value. This shows that the IDY-1 well is a well-saturated sandstone reservoir.

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Identification of hydrothermal deposit mineralized zones using the induced polarization method in Kasihan Area, Pacitan, East Java

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Journal of Physics: Conference Series 2019年第1期1242卷

作者： Asrafil I Suyanto S Rugayya Geological Engineering Study Program Tadulako University Indonesia Geophysics Study Program Universitas Gadjah Mada Indonesia Department of Physics Tadulako University Indonesia

The research area is one of the areas that have potential of hydrothermal deposit mineralization in Pacitan regency. This research aims to identify the presence of hydrothermal deposit mineralized zones through geophysical exploration by using induced polarization method in the study area. The induced polarization method is used to obtain anomalies in the form of contrast of resistivity and chargeability values in the study area. The results showed that the mineralized zones of hydrothermal deposit in the study area were characterized by significant anomaly contrast with the intensity of medium-high (> 100 Ωm) resistivity values associated with medium-value chargeability (20-50 ms). The association of resistivity and other chargeability values shows an intense alteration zone around the metal mineral deposits zone in the subsurface.

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Reconstructing past landslide models based on subsurface resistivity profiles: case study from Majene West Sulawesi

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IOP Conference Series: Earth and Environmental Science 2019年第1期279卷

作者： Ardy Arsyad Sabrianto Aswad Erfan Syamsuddin Department of Civil Engineering Faculty of Engineering Hasanuddin University Makassar Indonesia Study Program of Geophysics Faculty of Mathematics and Natural Science Hasanuddin University Makassar Indonesia

This paper presents a case study of reconstructing past landslide failure models in a napal geological formation by undertaking a series of geoelectrical tomographies and geotechnical bor-SPT surveys. study area is located in the National Artery Road 135 Kilometres, Majene – Mamuju, West Sulawesi. Geological formation found in the area is Napal Pambauang Formation. Massive ground movement is obviously detected in the area, and several landslide events have been occured in the last 10 years. In order to derive an effective technnique of mitigating the landslide in the area, past landslide failure models are needed to reconstruct. Therefore, 2D geoelectric tomographies survey combined several geotechnical bors were undertaken. A Framework of geophysics and geotechnical investigations was developed and implemented. The results show that slope failure models can be mapped, following unique patterns in the subsurface resistivity models. The finding slope failure models are well agreement with successive scarp patterns founded in the slope area. Past and recent landslides and future landslide are derived and this can be employed to design effective landslide mitigation strategies.

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A Non-Linear Method for Hypocenter Determination around Central and East Java Region: Preliminary Result

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IOP Conference Series: Earth and Environmental Science 2019年第1期318卷

作者： Faiz Muttaqy Andri Dian Nugraha Nanang T Puspito Pepen Supendi Shindy Rosalia Geophysical Engineering Study Program Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Global Geophysics Research Group Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Agency for Meteorology Climatology and Geophysics (BMKG) Bandung Indonesia

Java Island is highly active tectonic zone and also has a complex geological system as a result of Indo-Australian plate that subducted under the Eurasian plate. This complexity produces many large and destructive earthquakes. Moreover, Java is a most densely populated region in Indonesia. The precise earthquake location can define and evaluate the seismic hazard in the area. In this study, we determined hypocenter location around the central and east Java region by using a non-linear method. We manually picked P-and S-wave arrival time recorded by BMKG network for the time period of 2009 to 2017. We used the minimum 1D seismic velocity model of ak135 to locate the events. We used some criteria for the determination of event location including (i) at least recorded by 4 station which has clear onset P and S arrival, and (ii) has magnitude (MW) > 3. The seismicity in the study area is controlled by subduction and many active faults distributed along the Java Island, also clustered in several areas such as Kendeng thrust, Opak river fault, Kebumen, Banyuwangi, and others. The result of this study indicates the accurately main shallow seismicity zones in central and eastern part of Java region, and also confirm the presence of active inland faults. As further studies, we will conduct 1D velocity modeling and relocate the hypocenters using an updated local 1D velocity model beneath the study area.

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Single microtremor method for estimating site fundamental frequency at a site in the historical city of Byblos - Lebanon

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IOP Conference Series: Materials Science and engineering 2019年第1期523卷

作者： N Tumur-Uyal B Setiawan M S Oucherif Department of Geology & Geophysics National University of Mongolia Mongolia Program Study of Geological Engineering Faculty of Engineering Syiah Kuala University Indonesia Geoexplo Cheraga Algiers Algeria

A single ambient noise measurement has been found to be useful in investigating the near-surface geology in particularly for estimating site fundamental frequency. This single microtremor method is very attractive and has been successfully applied in many projects as the method is non-destructive, low cost, feasible for urban environments, fast, and deep penetration. Furthermore, this single microtremor method has been successfully applied in many projects. This paper presents the application of the single microtremor method to estimate the site fundamental frequency at a site in the historical city of Byblos, Lebanon. Pre-processing of industrial origin detection was carried out. Several durations of the measurements were investigated to obtain the most stable results. The site fundamental frequency was validated using one-dimensional site response analysis. The results are presented in this paper.

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3D model of Krakatau volcano subsurface structure based on gravity data

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Journal of Physics: Conference Series 2019年第1期1242卷

作者： D V Oemaiya D Santoso Geophysical Engineering Study Program Faculty of Mining and Petroleum Engineering Institute of Technology Bandung Applied and Exploration Geophysics Research Group Faculty of Mining and Petroleum Engineering Institute Technology Bandung

Krakatau is one of the volcano in Indonesia which has the destructive paroxysmal eruption. Eruption on 1883 was estimated had VEI of 6. The eruption was recorded as one among some most violent volcanic eruption event in the world. Gravity method is one of the geophysical methods that could delineate the subsurface structure base on density variation. Therefore, the objectives of this research are to reconstruct the 3D subsurface structure of the Krakatau volcano especially the approximate location and dimension of the magma chamber. The subsurface model of Krakatau was done by 3D modelling using residual anomaly map. In order to develop the status of magma chamber model, the available information on the geological map of Krakatau and surrounding area was used. Besides that, some information relative to the volcano such as the information derived from earthquake wave attenuation were utilized. The result of the study shows that position its volcano magma chamber is not directly vertical or oblique under the volcano crater and it has multiple chambers which trending northwest-southeast.

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Preliminary Gravity study of Pre-Tertiary and Tertiary Rock in Northern Kebumen, Central Java, Indonesia

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IOP Conference Series: Earth and Environmental Science 2019年第1期318卷

作者： Faridz Nizar Ahmady Djoko Santoso Geophysical Engineering Study Program Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Bandung 40132 Indonesia Applied Geophysics Research Group Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Bandung 40132 Indonesia

Luk Ulo Melange Complex is a Pre-Tertiary rock formation consisting of various lithological background and complicated geological structure. Located in Northern Kebumen Regency, this rock is originally interpreted as products of tectonic process caused by paleo-subduction between Indian Oceanic Plate beneath Eurasian Plate in Cretaceous age. According to previous study on geological surface investigation shows that the melange complex is tectonically overlain by Tertiary sedimentary formation. On the contrary, geophysical study of the subsurface condition of the area is still under discussion due to limited of measured data. In order to obtain detailed subsurface image, gravity profiling was measured and interpreted across both Tertiary and pre-Tertiary rock. Frequency domain filter and designed moving average filter were used to separate residual and regional anomaly. The results denote gravity value of residual anomaly varying from -5 to +5 mGal, while regional anomaly is ranging from 150-180 mGal respectively. The preliminary interpretation was developed by taking into account the geological information and also the data that was collected during field campaign. Overall, high gravity anomaly is interpreted as diabase intrusion in the middle of research area. Meanwhile, low gravity anomaly indicated clay rich rock material related to matrix content of Luk-Ulo Melange Complex in the northern area.

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Coupled Hydraulic and Mechanics Finite Element Modeling of CO2 Injection into a Layered Isotropic Media Using FEHM

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IOP Conference Series: Earth and Environmental Science 2019年第1期318卷

作者： Herdis Haerusalam David P. Sahara Fatkhan Study Program of Geophysical Engineering Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Ganesha 10 Bandung 40132 Indonesia Global Geophysics Research Group Faculty of Mining and Petroleum Engineering Insitut Teknologi Bandung Ganesha 19 Bandung 40132 Indonesia Exploration and Engineering Seismology Research Group Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Ganesha 10 Bandung 40132 Indonesia

CO2 injection into the hydrocarbon reservoir affects the subsurface mechanics and hydraulic condition. The injection has to be performed in a way that there will be no reservoir and/or top seal failure. In such case, a simulation of the injected fluid propagation needs to be performed to see its possible impact to the top seal and existing major faults. We use finite element method to perform this injection simulation. In this research, we use open source software Finite Element Heat and Mass Transfer Code (FEHM) to simulate CO2 injection processes into reservoir. Subsurface geological model was constructed in a dimension of 3000 m (easting) x 3000 m (northing) x 2000 m (vertical). Vertically, it consists of four layers which represent upper layer (400 m), top seal (200 m), reservoir (900 m), and basement (500m). The grid around the reservoir rocks is refined to give more detail results. The open hole injection is set at 850 - 890 m depth, 1500 m easting and 1500 m northing. The material is assumed to be isotropic. The initial pressure and temperature increase as a function of depth with a pressure gradient of 0.00981 MPa/m and a temperature gradient of 0.025 degrees C/m. A vertical fault is modelled at 600 m eastern to the injection well. Injection process is carried out with 6 kg/s of CO2 injection with simulation time for ten years to see its impact to the fault. A vertical fault is The modelling results show that the CO2 injection will not reactivate the fault at 10 years.

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Hypocenter relocation of the aftershocks of the Poso, Sulawesi (Mw 6.6, May 29, 2017) event using the BMKG network data

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AIP Conference Proceedings 2018年第1期1987卷

作者： Pepen Supendi Andri Dian Nugraha Sri Widiyantoro 1Geophysical Engineering Study Program Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Bandung 40132 Indonesia 2Agency for Meteorology Climatology and Geophysics (BMKG) Bandung Indonesia 3Global Geophysics Research Group Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Bandung 40132 Indonesia

On May 29, 2017, an earthquake (Mw 6.6) occurred in the Poso District, central Sulawesi. This earthquake caused damage to houses and infrastructures and several people were seriously injured. About one minute after the mainshock, aftershock sequences occurred around the fault area. Up to June 4, 2017, the BMKG network had recorded 293 aftershock events. We have successfully relocated 238 out of the 293 aftershocks using hypocenter double-difference method. The results indicate improvement in hypocenter location, where the initial earthquakes focal depths fixed at a depth of 10 km have been updated. Our results show that there are two event clusters in a northwest-southeast direction. The first cluster is indicated as aftershocks and the second one is probably the triggered seismicity by the mainshock. A validation through the histogram of travel-time residuals depicts statistically fairly good relocation results, in which the residuals are mostly close to zero.

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