检索结果-内蒙古大学图书馆

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

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.

关键词：

来源：评论

学校读者我要写书评

暂无评论

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

引用

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.

关键词：

来源：评论

学校读者我要写书评

暂无评论

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

引用

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.

关键词：

来源：评论

学校读者我要写书评

暂无评论

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

引用

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.

关键词：

来源：评论

学校读者我要写书评

暂无评论

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

引用

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.

关键词：

来源：评论

学校读者我要写书评

暂无评论

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

引用

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.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Earthquake swarm analysis around Bekancan area, North Sumatra, Indonesia using the BMKG network data: Time periods of February 29, 2015 to July 10, 2017

引用

AIP Conference Proceedings 2018年第1期1987卷

作者： Andri Dian Nugraha Pepen Supendi Sri Widiyantoro Daryono Samsul Wiyono 1Global Geophysics Research Group Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Bandung 40132 Indonesia 2Geophysical Engineering Study Program Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Bandung 40132 Indonesia 3Agency for Meteorology Climatology and Geophysics (BMKG) Bandung Indonesia 4Agency for Meteorology Climatology and Geophysics (BMKG) Jakarta Indonesia

Earthquake swarm are common occur around active tectonic and volcanic regions. The recent activities of swarm event occurred around Bekancan area, North Sumatra Province, Indonesia for February 29, 2015 to July 10, 2017 recorded by BMKG local/regional network. This location close to Sinabung and Sibayak volcanoes, lead to our intriguing to analysis of source mechanism and location of the swarm event. We attempted to update hypocenter location of BMKG data catalogue by applying double-difference method. We have successfully relocated of 152 swarm events in the area. The relocated events appear about 10 km northeast of Sinabung volcano with focus depth of about 0 to 30 km (below sea level), however very close to Sibayak volcano area. Overall, the dominant frequency of the event from the closest station is about 2 to 9 Hz. So, our preliminary interpretation is the location of swarm events close to Sinabung and Sibanyak volcanoes in Bekancan area which probably related to stress change due to volcanic-tectonic activity.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Hypocenter relocation of earthquake swarm around Jailolo volcano, North Molucca, Indonesia using the BMKG network data: Time periods of September 27-October 10, 2017

引用

AIP Conference Proceedings 2018年第1期1987卷

A year after the hundreds of earthquake swarm last year (2015-2016), recent swarm activity in Jailolo, north of Maluku area, Indonesia began to reactivated. We have successfully relocated 108 out of the 130 earthquake swarm from September 27 to October 10, 2017 by using the BMKG network data through hypocenter double-difference method. The results indicate improvement in hypocenter location, where the initial earthquake focal depths fixed at a depth of 10 km has been updated. A validation through the histogram of travel-time residual depicts good relocation results, in which the residual values are mostly close to zero. The relocated hypocenters are located close to Jailolo volcano area which has focus depths of about 5 – 30 km. We analyzed of waveform of several swarm events (with largest and smallest magnitude) which are recorded by the nearest BMKG station and show has frequency range of 2 to 8 Hz. Our preliminary interpretation, these swarm events probably associated with stress change due to combination of tectonic and deep magma activity in the area.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Preliminary study results of crustal structure beneath Mount Merapi, Central Java, Indonesia

引用

AIP Conference Proceedings 2018年第1期1987卷

作者： Sandy Kurniawan Suhardja Sri Widiyantoro Mohamad Ramdhan J.-P. Métaxian 1Department of Geophysical Engineering Faculty of Exploration and Production Pertamina University Jakarta 12220 Indonesia 2Global Geophysics Research Group Faculty of Mining and Petroleum Engineering Bandung Institute of Technology Bandung 40132 Indonesia 3Earth Sciences Study Program Faculty of Earth Sciences and Technology Bandung Institute of Technology Bandung 40132 Indonesia 4ISTerre IRD R219 CNRS Université de Savoie Mont Blanc Le Bourget-du-Lac France

In this study, we put an effort to estimate crustal depth and image crustal structure beneath Merapi volcano by employing multicomponent analysis popularly known as Receiver Function technique. We collected a series of waveforms from teleseismic events recorded from October 2013 to mid-April 2015 at 53 stations as a part of DOMERAPI project. We processed selected seismograms by simple deconvolution process between radial and vertical components to estimate the depth of Moho discontinuity beneath the volcano. Current results show complex structure beneath the volcano and a relatively potential Moho depth at about 30 km, which becomes shallower to the North at about 23 km. Stations located at Southern and Northern area show potential low velocity zone though a velocity modelling is necessary to confirm its depth and how low the velocity is.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Preliminary result of 3-D attenuation tomography beneath Sunda Strait and western part of Java

引用

AIP Conference Proceedings 2017年第1期1857卷

作者： Muhajir Anshori Andri Dian Nugraha Nanang T. Puspito 1Master Student of Earth Science Study Program Faculty of Earth Sciences and Technology InstitutTeknologi Bandung Indonesia 2Indonesian Meteorological Climatological and Geophysical Agency (MCGA) Indonesia 3Global Geophysics Research Group Faculty of Mining and Petroleum Engineering InstitutTeknologi Bandung Indonesia

Sunda strait lies in the transition zone of two different subduction system that is almost perpendicular to the subduction in southern Java and oblique subduction in western Sumatra. The series of major disasters such as earthquakes and volcanic eruptions is a manifestation of its tectonic setting complexity. We used selected waveform data from724 earthquakes that occurred around the Sunda strait and western part of Java from 2009 – 2015 recorded by 21 MCGA network stations to construct three dimensional image of seismic attenuation. Frequency independent attenuation operators (t*) was determined using spectral fitting method for P and S wave arrivals, respectively. The inversion was performed using simul2000 algorithm to image the lateral and vertical variations of Qp and Qs value in the Sunda Strait and western part of Java. Some interesting features such as subducting slab, mantle wedge, magma chamber under volcanos and fault zones can be imaged well.

关键词：

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：