检索结果-内蒙古大学图书馆

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

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 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

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

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

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

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

Relocation of hypocenters from DOMERAPI and BMKG networks： a preliminary result from DOMERAPI project

引用

Earthquake Science 2017年第2期30卷 67-79页

作者： Mohamad Ramdhan Sri Widiyantoro Andri Dian Nugraha Jean-Philippe Métaxian Asep Saepuloh Said Kristyawan Andry Syaly Sembiring Agus Budi Santoso Antoine Laurin Ahmad Ali Fahmi Study Program of Earth Sciences Faculty of Earth Science andTechnology Institute of Technology Bandung Jalan Ganesa No.10 Bandung 40132 Indonesia Agency for Meteorology Climatology and Geophysics(BMKG) Jakarta Indonesia Global Geophysics Research Group Faculty of Mining andPetroleum Engineering Institute of Technology Bandung JalanGanesa No. 10 Bandung 40132 Indonesia Research Center for Disaster Mitigation Institute of TechnologyBandung Jalan Ganesa No. 10 Bandung 40132 Indonesia ISTerre IRD R219 CNRS Universite de Savoie Mont BlancLe Bourget-du-Lac France Faculty of Earth Sciences and Technology Institute of Technology Bandung Jalan Ganesa No. 10 Bandung 40132Indonesia Center for Volcanology and Geological Hazard Mitigation Geological Agency Jalan Diponegoro No. 57 Bandung 40122Indonesia

Merapi volcano located in central Java, Indonesia,is one of the most active stratovolcanoes in the world. Many Earth scientists have conducted studies on this volcano using various methods. The geological features around Merapi are very attractive to be investigated because they have been formed by a complex tectonic process and volcanic activities since tens of millions of years ago. The southern mountain range, Kendeng basin and Opak active fault located around the study area resulted from these processes. DOMERAPI project was conducted to understand deep magma sources of the Merapi volcano comprehensively. The DOMERAPI network was running from October 2013 to mid-April 2015 by deploying 46 broad-band seismometers around the volcano. Several steps, i.e., earthquake event identification,arrival time picking of P and S waves, hypocenter determination and hypocenter relocation, were carried out in this study. We used Geiger＇s method（Geiger 1912） for hypocenter determination and double-difference method for hypocenter relocation. The relocation result will be used to carry out seismic tomographic imaging of structures beneath the Merapi volcano and its surroundings. For the hypocenter determination, the DOMERAPI data were processed simultaneously with those from the Agency for Meteorology, Climatology and geophysics（BMKG） seismic network in order to minimize the azimuthal gap. We found that the majority of earthquakes occurred outside the DOMERAPI network. There are 464 and 399 earthquakes obtained before and after hypocenter relocation, respectively. The hypocenter relocation result successfully detects some tectonic features, such as a nearly vertical cluster of events indicating a subduction-related backthrust to the south of central Java and a cluster of events to the east of Opak fault suggesting that the fault has an eastward dip.

关键词： Earthquake Relocation DOMERAPI BMKG Tectonic feature

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

Introduction to stress triggers, stress shadows and their implications for seismic hazard in Indonesia

引用

AIP Conference Proceedings 2018年第1期1987卷

作者： David P. Sahara Dian Kusumawati Afnimar Wahyu Triyoso Sri Widiyantoro Andri D. Nugraha Nanang T. Puspito Global Geophysics Research Group Faculty of Petroleum and Mining Engineering Bandung Institute of Technology Jl. Ganesha 10 Bandung 40132 Indonesia Earth Sciences Study Program Faculty of Earth Sciences and Technology Bandung Institute of Technology Jl. Ganesha 10 Bandung 40132 Indonesia

Many aspects of earthquake mechanics remain an enigma, e.g.: earthquake interaction and seismic hazard mitigation. One potential bright spot is the finding that simple calculations of stress changes may explain some earthquake occurrences and interactions. This progress is especially lead by abundant studies of stress changes of human-induced seismicity. This work introduces stress triggers, stress shadows, and their implications for seismic hazard in Indonesia. We review our work on stress analysis of the 2016 Aceh earthquake and present a compilation of quantitative earthquake interaction studies from a stress change perspective. The 2016 earthquakes were deadly, caused more than 100 causalities, and unpredicted, in a sense that the driving force and the source mechanism remain unclear. No information was present on the extent of the faulting or the direction of propagation of the event. Therefore, it requires a stress transfer modeling in order to understand the possible seismic hazard distribution. The results of this study provide some clues about certain aspects of earthquake mechanics. It also demonstrates that we still have a lot of work ahead of us before we can understand the complete mechanism of how an earthquake occurs.

关键词：

来源：评论

学校读者我要写书评

暂无评论

INTRODUCTION

引用

Bulletin of the American Meteorological Society 2024年第8期105卷 S1-S11页

作者： Boyer, T. Blunden, J. Dunn, R.J.H. NOAA/NESDIS National Centers for Environmental Information Silver Spring Maryland NOAA/NESDIS National Centers for Environmental Information Asheville North Carolina Met Office Hadley Centre Exeter United Kingdom European Centre for Medium-Range Weather Forecasts Reading United Kingdom University of Maryland College Park Maryland Scripps Institution of Oceanography University of California San Diego La Jolla California NOAA/NWS National Centers for Environmental Prediction Climate Prediction Center College Park Maryland Brandenburg University of Technology (BTU) Cottbus-Senftenberg Germany Servicio Meteorológico Nacional Buenos Aires Argentina NOAA/OAR Physical Sciences Laboratory Boulder Colorado European Centre for Medium-Range Weather Forecasts Bonn Germany Center for Geophysical Research and School of Physics University of Costa Rica San José Costa Rica Department of Meteorology and National Centre for Earth Observation University of Reading Reading United Kingdom Centro Nacional de Monitoramento e Alertas de Desastres Naturais CEMADEN São Paulo Brazil Université Grenoble Alpes Institut des Géosciences de l’Environnement IRD CNRS Grenoble INP Grenoble France Hampton University Hampton Virginia Seychelles Meteorological Authority Mahe Seychelles Section for Glaciers Ice and Snow Norwegian Water Resources and Energy Directorate Oslo Norway National Research Institute for Agriculture Food and Environment (INRAE) CARRTEL Université Savoie Mont Blanc Thonon les Bains France Graduate School of Agriculture Osaka Metropolitan University Sakai Japan Science Faculty Universidad Nacional de Colombia Bogotá Colombia University of Bremen Bremen Germany NOAA Global Monitoring Laboratory Boulder Colorado Servicio Nacional de Meteorología e Hidrología del Perú Lima Perú Centro de Investigaciones sobre Desertificación – Spanish National Research Council (CSIC-UV-GVA) Valencia Spain Hydro-Climate Extremes Lab (H-CEL) Ghent University Ghent Belgium Department o

In 2023, La Niña conditions that generally prevailed in the eastern Pacific Ocean from mid-2020 into early 2023 gave way to a strong El Niño by October. Atmospheric concentrations of Earth’s major greenhouse gases—carbon dioxide, methane, and nitrous oxide—all increased to record-high levels. The annual global average carbon dioxide concentration in the atmosphere rose to 419.3±0.1 ppm, which is 50% greater than the pre-industrial level. The growth from 2022 to 2023 was 2.8 ppm, the fourth highest in the record since the 1960s. The combined short-term effects of El Niño and the long-term effects of increasing levels of heat-trapping gases in the atmosphere contributed to new records for many essential climate variables reported here. The annual global temperature across land and oceans was the highest in records dating as far back as 1850, with the last seven months (June–December) having each been record warm. Over land, the globally averaged temperature was also record high. Dozens of countries reported record or near-record warmth for the year, including China and continental Europe as a whole (warmest on record), India and Russia (second warmest), and Canada (third warmest). Intense and widespread heatwaves were reported around the world. In Vietnam, an all-time national maximum temperature record of 44.2°C was observed at Tuong Duong on 7 May, surpassing the previous record of 43.4°C at Huong Khe on 20 April 2019. In Brazil, the air temperature reached 44.8°C in Araçuaí in Minas Gerais on 20 November, potentially a new national record and 12.8°C above normal. The effect of rising temperatures was apparent in the cryosphere, where snow cover extent by June 2023 was the smallest in the 56-year record for North America and seventh smallest for the Northern Hemisphere overall. Heatwaves contributed to the greatest average mass balance loss for Alpine glaciers around the world since the start of the record in 1970. Due to rapid volume loss beginning in 2021, St. A

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

Influence of water saturation on ultrasonic P-wave velocity in weakly compacted sandstone

引用

Journal of Physics: Conference Series 2017年第1期795卷

作者： Thaqibul Fikri Niyartama Umar Fauzi Fatkhan Physics Study Program Universitas Islam Negeri Sunan Kalijaga Yogyakarta Jl. MarsdaAdiSucipto No. 1 Yogyakarta 55281 INDONESIA Physics of Earth and Complex Systems ITB Jl. Ganesha 10. Bandung 40132 INDONESIA Geophysics Engineering ITB Jl. Ganesha 10. Bandung 40132 INDONESIA

Laboratory measurements of Ultrasonic P-wave velocities were conducted in weakly compacted sandstone with varying degree of water saturations. We used P wave transducer at frequency 63 kHz and imbibition technique in order to study the influence of water saturation on the P-wave velocity. Our experiment showed that the P-wave velocity (Vp) was reduced significantly at the beginning of the imbibition process. The variations on travel times and the amplitude changes were detected at any degree of saturation. The first and second amplitude of P wave decreased as water saturation (Sw ) increased in the range of 0.1 to 0.6 in B5 sample, the amplitude increased again afterward. The shifting peaks of the signal that indicated attenuation were also observed in the experimental.

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

主题

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

主题

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：