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Sensor GY-68 module installation for landslide monitoring simulation prototype to determine hazard potential in declining topography

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AIP Conference Proceedings 2018年第1期1987卷

作者： Ryan Bobby Andika Widodo Teddy Setiawan Okta Indah Sulistyorini Pagestu Soekarno Utomo Mahdy 1Geophysical Engineering Program Institut Teknologi Bandung Bandung Indonesia

Indonesia is a country which consists of islands, characterized with variety of topography. Indonesia lies at the equator line which explains the tropical climate with the known fact is the high number of rainfall. This high weathering activity processes that are triggered by rainfall will accumulate sandstone, shale, and clay. The presence of residual rocks as the concern of weathering process is strongly linked to natural disaster, in this case, landslides. Mahokpangbob is a technology-based device specially designed to mitigate the hazard of landslide in an area. The device detects and record changes in relative altitude from a point to sea level, assisted by sensors GY-68 that are integrated to a microcontroller. Technically, Mahokpangbob will make the most of GY-68 usage as the sensor will record multiple values of altitude in several points. These value will be generated into an image of a plane, which represents soil condition. GY-68 will record the coordinates as X and Y, and place them as the input for surface modeling. The monitoring of the X and Y position will be done in time-lapse, so that further changes of the positions may be noticeable. Should there be any changes in the assigned measurement points, it indicates that there has been a movement or avalanche in the said area. The device will be installed remotely for its prototype trial, and it is hoped to bring improvement in civil society in order to respond to a landslide hazard both responsively and quickly.

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Tomographic imaging of Central Java, Indonesia: Preliminary result of joint inversion of the MERAMEX and MCGA earthquake data

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AIP Conference Proceedings 2013年第1期1554卷 234-237页

作者： Supriyanto Rohadi Sri Widiyantoro Andri Dian Nugraha Masturyono Study Program of Earth Sciences Faculty of Earth Sciences and Technology Institute of Technology Bandung Jl. Ganesha No.10 Bandung 40132 Indonesia and Meteorological Climatological and Geophysical Agency Jl. Angkasa 1 No.2 Kemayoran Jakarta Indonesia Global Geophysics Research Group Faculty of Mining and Petroleum Engineering Institute of Technology Bandung Jl. Ganesha No.10 Bandung 40132 Indonesia Meteorological Climatological and Geophysical Agency Jl. Angkasa 1 No.2 Kemayoran Jakarta Pusat Indonesia

The realization of local earthquake tomography is usually conducted by removing distant events outside the study region, because these events may increase errors. In this study, tomographic inversion has been conducted using the travel time data of local and regional events in order to improve the structural resolution, especially for deep structures. We used the local MERapi Amphibious EXperiments (MERAMEX) data catalog that consists of 292 events from May to October 2004. The additional new data of regional events in the Java region were taken from the Meteorological, Climatological, and geophysical Agency (MCGA) of Indonesia, which consist of 882 events, having at least 10 recording phases at each seismographic station from April 2009 to February 2011. We have conducted joint inversions of the combined data sets using double-difference tomography to invert for velocity structures and to conduct hypocenter relocation simultaneously. The checkerboard test results of Vp and Vs structures demonstrate a significantly improved spatial resolution from the shallow crust down to a depth of 165 km. Our tomographic inversions reveal a low velocity anomaly beneath the Lawu - Merapi zone, which is consistent with the results from previous studies. A strong velocity anomaly zone with low Vp, low Vs and low Vp/Vs is also identified between Cilacap and Banyumas. We interpret this anomaly as a fluid content material with large aspect ratio or sediment layer. This anomaly zone is in a good agreement with the existence of a large dome containing sediment in this area as proposed by previous geological studies. A low velocity anomaly zone is also detected in Kebumen, where it may be related to the extensional oceanic basin toward the land.

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Earthquake hypocenter relocation using double difference method in East Java and surrounding areas

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AIP Conference Proceedings 2015年第1期1658卷

作者： Aprilia Puspita C Andri Dian Nugraha Nanang T Puspito 1Geophysical Engineering Program Faculty of Mining and Petroleum Engineering Institute of Technology Bandung Indonesia 2Meteorological Climatological and Geophysical Agency (MCGA) of Indonesian Jakarta Indonesia 3Global Geophysical Research Group Faculty of Mining and Petroleum Engineering Institute of Technology Bandung Indonesia

Determination of precise hypocenter location is very important in order to provide information about subsurface fault plane and for seismic hazard analysis. In this study, we have relocated hypocenter earthquakes in Eastern part of Java and surrounding areas from local earthquake data catalog compiled by Meteorological, Climatological, and geophysical Agency of Indonesia (MCGA) in time period 2009-2012 by using the double-difference method. The results show that after relocation processes, there are significantly changes in position and orientation of earthquake hypocenter which is correlated with the geological setting in this region. We observed indication of double seismic zone at depths of 70-120 km within the subducting slab in south of eastern part of Java region. Our results will provide useful information for advance seismological studies and seismic hazard analysis in this study.

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2D modelling gravity methods for mapping subsurface basin of Bandar Lampung city

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AIP Conference Proceedings 2022年第1期2563卷

作者： Nandi Haerudin Rustadi Roniyus Marjunus Ahmad Zaenudin Aulia Kurniasih Istifani Ferucha Geophysical Engineering Study Program Universitas Lampung Jl. Sumantri Brodjonegoro No. 1 Bandar Lampung Lampung 35145 Indonesia

The rapid population growth rate in Bandar Lampung City has an impact on the rapidly increasing demand for groundwater. This study aims to map groundwater basins in the Bandar Lampung area. It is necessary to carry out management and monitoring to monitor the availability of groundwater in the research area with an understanding of the existence of basins in the research area. Mapping of the subsurface basin was carried out using the gravity method to see the distribution of gravity anomalies in the study area. The low Bouguer anomaly which forms a circular closed closure is interpreted as a subsurface basin zone which is assumed to be a groundwater basin flanked by bedrock heights indicated by high gravity anomalies. 2D modeling of the research area can also show the presence of a basin and elevation zone composed of 4 rock layers, namely andesite, sandy tuff, clay tuff, and lava (andesite-basalt). The Bandar Lampung Basin is identified as being in the eastern part of the study area.

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Recent destructive earthquakes around Garut area, West Java, Indonesia: An unidentified fault?

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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

In the last two years two earthquakes occurred and caused some damages to buildings in Pangalengan (2016) and Garut (2017) regions. In this study, we have conducted hypocenter determination with high accuracy and focal mechanism analysis of the two events to estimate the type of fault slip. We have determined the earthquake locations through re-picking of the P- and S-wave arrival times recorded by the BMKG seismic network in West Java. Earthquake locations have been determined using the Hypoellipse codes that employ a single event determination method. Both of these earthquakes are indicated as a result of an unidentified fault (we name it as GARSELA fault), which has a southwest-northeast trending direction. The focal mechanism solutions for these two events show a strike-slip fault type and normal fault type, respectively. Based on our previous study, this fault has also a high seismicity activity (small events). It is suggestive that the recent two events indicate that GARSELA is an active fault.

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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

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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Seismicity studies at Moluccas area based on the result of hypocenter relocation using HypoDD

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AIP Conference Proceedings 2015年第1期1658卷

作者： Muhammad Reza July Utama Andri Dian Nugraha Nanang T. Puspito 1Student of Geophysical Engineering Study Program Institute of Technology Bandung Indonesia 2Indonesian Meteorological Climatological and Geophysical Agency (MCGA) Jakarta Indonesia 3Global Geophysical Research Group Faculty of Mining and Petroleum Engineering ITB Indonesia

The precise hypocenter was determined location using double difference method around subduction zone in Moluccas area eastern part of Indonesia. The initial hypocenter location from MCGA data catalogue of 1,945 earthquake events. Basically the principle of double-difference algorithm assumes if the distance between two earthquake hypocenter distribution is very small compared to the distance between the station to the earthquake source, the ray path can be considered close to both earthquakes. The results show the initial earthquakes with a certain depth (fix depth 10 km) relocated and can be interpreted more reliable in term of seismicity and geological setting. The relocation of the intra slab earthquakes beneath Banda Arc are also clearly observed down to depth of about 400 km. The precise relocated hypocenter will give invaluable seismicity information for other seismological and tectonic studies especially for seismic hazard analysis in this region.

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Hypocenter relocation using a fast grid search method and a 3-D seismic velocity model for the Sumatra region

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AIP Conference Proceedings 2013年第1期1554卷 293-296页

作者： Hendro Nugroho Sri Widiyantoro Andri Dian Nugraha Study Program of Earth Sciences Faculty of Earth Sciences and Technology Institute of Technology Bandung Jl. Ganesha No. 10 Bandung 40132 Indonesia and Meteorological Climatological and Geophysical Agency Jl. Angkasa 1 No. 2 Kemayoran Jakar Indonesia Global Geophysics Research Group Faculty of Mining and Petroleum Engineering Institute of Technology Bandung Jl. Ganesha No. 10 Bandung 40132 Indonesia Global Geophysics Research Group Faculty of Mining and Petroleum Engineering Institute of Technologyc Bandung Jl. Ganesha No. 10 Bandung 40132 Indonesia

Determination of earthquake hypocenter in Indonesia conducted by the Meteorological, Climatological, and geophysical Agency (MCGA) has still used a 1-D seismic velocity model. In this research, we have applied a Fast Grid Search (FGM) method and a 3-D velocity model resulting from tomographic imaging to relocate earthquakes in the Sumatran region. The data were taken from the MCGA data catalog from 2009 to 2011 comprising of subduction zone and on land fault earthquakes with magnitude greater than 4 Mw. Our preliminary results show some significant changes in the depths of the relocated earthquakes which are in general deeper than the depths of hypocenters from the MCGA data catalog. The residual times resulting from the relocation process are smaller than those prior to the relocation. Encouraged by these results, we will continue to conduct hypocenter relocation for all events from the MCGA data catalog periodically in order to produce a new data catalog with good quality. We hope that the new data catalog will be useful for further studies.

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Preliminary focal mechanism pattern along the central part of the Great Sumatran Fault, Indonesia

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AIP Conference Proceedings 2018年第1期1987卷

作者： Alief Rizky Ramadhan Dian Kusumawati David P. Sahara Sri Widiyantoro 1Geophysical Engineering Study Program Faculty of Petroleum and Mining Engineering Bandung Institute of Technology Jl. Ganesha 10 Bandung 40132 Indonesia 2Earth Sciences Study Program Faculty of Earth Sciences and Technology Bandung Institute of Technology Jl. Ganesha 10 Bandung 40132 Indonesia 3Global Geophysics Research Group Faculty of Petroleum and Mining Engineering Bandung Institute of Technology Jl. Ganesha 10 Bandung 40132 Indonesia

According to the world stress map, the regional in-situ stress along the Great Sumatran Fault (GSF) is assumed to be strike-slip, and the maximum principal stress (SHmax) is oriented toward N15°E. However, this was estimated from limited global focal mechanisms available along the GSF. A larger dataset of focal mechanisms along the GSF is required to revise the solution and infer the local stress perturbation. To create a new focal mechanism catalogue of local events, we worked on waveform data from a joint seismic network of 35 stations deployed by the Indonesian Agency for Meteorology, Climatology, and Geophysics (BMKG) and the GeoForschungZentrum (GFZ) Germany. The seismic network has a full coverage of the Sumatran fault. From October 2008 to February 2017, there were 476 events with magnitude (Mw) greater than 3 and focal depth shallower than 100 km that occurred in the central part of GSF. Arrival time picking of P and S waves and polarity identification were performed manually using Seisgram. The polarity of P waves was then used to obtain the focal mechanism of the events in the 4 segments of GSF branches (Northwest, Southwest, Northeast, and Southeast). The new local focal mechanism catalogue can be used, together with the global one, to invert the detailed stress heterogeneity in the study area.

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Shear wave velocity analysis for site classification of Tadulako University using microtremor measurements

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AIP Conference Proceedings 2023年第1期2719卷

作者： Icha Untari Meidji Nurhayati Pimpilemba Hendrik Leopatty Mauludin Kurniawan Mustafa Ahmad Harsano Jayadi Physics Department Universitas Negeri Gorontalo Gorontalo Indonesia Agency for Meteorology Climatology and Geophysics (BMKG) Class 1 Palu Indonesia Geophysical Engineering Department University of Tadulako Palu Indonesia Geological Engineering Study Program University of Tadulako Palu Indonesia Doctoral Program of Physics Department ITS Surabaya Indonesia

Shear wave velocity (Vs30) is one of the local condition parameters often used to determine buildings’ vulnerability to potential damage if an earthquake occurs. This parameter is essential for planning and evaluation in infrastructure development. Tadulako University, which is repairing the building and the layout of the campus area after the September 28, 2018 earthquake, needs to consider the parameters of the shear wave. Measurements of the Vs30 value have been carried out at 20 points spread across Tadulako University using the microtremor method. The value of Vs30 is then estimated to determine the classification of the surface soil. The results obtained indicate that the variation in value is not too significant; it is between 424 m/s – 530 m/s. This value is included in the C class site and has very dense soil and soft rock soil profile classification. The highest value is in the southwest part, and the lowest value is in the northeast part.

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