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2023 International Conference on Information Technology and Computing, ICITCOM 2023

作者： Arrizal, Hanifullah Hafidz Sinambela, Marzuki Widodo Adi, Suko Prayitno Frianto, Herri Trisna Undergraduate Program in Applied of Instrumentation Meteorology Climatology Geophysics Stmkg Jakarta Indonesia Undergraduate Program in Applied of Geophysics Stmkg Jakarta Indonesia Undergraduate Program in Applied of Electrical Engineering Politeknik Negeri Medan Medan Indonesia

ISBN: (纸本)9798350359633

In the seismic-prone region of Northern Sumatra, where recent events like the Toba earthquake swarm have reshaped the land's seismic dynamics, understanding the spatial distribution and clustering of earthquakes is paramount for disaster mitigation. This study employs the K-Medoids algorithm to analyze seismic data from January 2019 to 2023, providing crucial insights into seismic event clustering. While K=2 emphasizes depth distinctions, K=3 unravels a nuanced perspective, capturing differences in both depth and geographical location of seismic events. The validity analysis supports these findings, contributing significantly to seismic hazard assessment in North Sumatra. This research underscores the need for ongoing study and heightened preparedness in earthquake-prone regions. © 2023 IEEE.

关键词： Earthquakes

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Introduction to this special section: Geophysical methods in archaeology

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Leading Edge 2024年第10期43卷 655-656页

作者： Krahenbuhl, Richard A. Wilt, Michael Colorado School of Mines Geophysics Department Humanitarian Engineering and Science Interdisciplinary Graduate Program GoldenCO United States Lawrence Berkeley National Laboratory Earth Science Division BerkeleyCA United States

Archaeogeophysics, i.e., the application and integration of geophysics into archaeological investigations, is an exciting and growing field of study and an international collaboration at the intersection of the physical and social sciences. Through the incorporation of ground-and drone-based geophysical and remote sensing tools, these collaborative teams continue to advance the field of archaeology by rapidly and accurately revealing hidden features of the past and helping to focus active archaeological digs. Equally relevant, yet often unnoticed, the inclusion of noninvasive geophysical tools likewise provides a means to understand and preserve historically and culturally sensitive sites without the need for extensive and potentially destructive excavations. © 2024 by The Society of Exploration Geophysicists.

关键词： geophysics

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Mantle flow underneath the South China Sea revealed by seismic anisotropy

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National Science Review 2023年第10期10卷 54-61页

作者： Fansheng Kong Rui Gao Stephen S.Gao Kelly H.Liu Weiwei Ding Xiongwei Niu Aiguo Ruan Pingchuan Tan Jianke Fan Shaoping Lu Zhengyi Tong Liqun Cheng Wenfei Gong Yanghui Zhao Jiabiao Li Key Laboratory of Submarine Geosciences Second Institute of OceanographyMinistry of Natural Resources Southern Marine Science and Engineering Guangdong Laboratory Geology and Geophysics Program Department of Geosciences and Geological and Petroleum Engineering Missouri University of Science and Technology School of Earth Sciences and Engineering Sun Yat-sen University Key Laboratory of Marine Geology and Environment Institute of Oceanology Chinese Academy of Sciences

It has long been established that plastic flow in the asthenosphere interacts constantly with the overlying lithosphere and plays a pivotal role in controlling the occurrence of geohazards such as earthquakes and volcanic ***,accurately characterizing the direction and lateral extents of the mantle flow field is notoriously difficult,especially in oceanic areas where deployment of ocean bottom seismometers(OBSs) is expensive and thus *** this study,by applying shear wave splitting analyses to a dataset recorded by an OBS array that we deployed between mid-2019 and mid-2020 in the South China Sea(SCS),we show that the dominant mantle flow field has a NNW-SSE orientation,which can be attributed to mantle flow extruded from the Tibetan Plateau by the ongoing Indian-Eurasian *** addition,the results suggest that E-W oriented flow fields observed in South China and the Indochina Peninsula do not extend to the central SCS.

关键词： mantle flow South China Sea Tibetan Plateau seismic anisotropy shear wave splitting

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Hysteresis Model of Permafrost Thermal State Variation with Air Temperature in Utqiaġvik, Alaska, Based on Distributed Temperature Sensing

Hysteresis Model of Permafrost Thermal State Variation with ...

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Geotechnical Frontiers 2025: Geotechnics of Natural Hazards

作者： Ji, Xiaohang Xiao, Ming Martin, Eileen Dept. of Civil and Environmental Engineering Pennsylvania State Univ. University ParkPA United States Dept. of Geophysics Dept. of Applied Math and Statistics Hydrologic Science and Engineering Program Colorado School of Mines GoldenCO United States

ISBN: (数字)9780784485996

Increasing air temperatures are driving permafrost warming across the Arctic and sub-Arctic. This in turn degrades the geomechanical properties of soils, disrupts the natural environment and infrastructure systems, and results in long-lasting societal impacts. Understanding the thermal state of degrading permafrost in the Arctic is crucial for maintaining resilient infrastructure in the changing Arctic. This study employs Distributed Temperature Sensing (DTS) to monitor permafrost temperature near Utqiaġvik, Alaska, from 2021 to 2024. Fiber-optic DTS sensors have unique and attractive characteristics that allow their deployment in the Arctic for low-maintenance, cost-effective, and high-resolution data. This paper presents the temperature recordings of a 2-km DTS system on the tundra near Utqiaġvik, Alaska, by the Elson Lagoon. A hysteresis model is developed to link permafrost temperature with air temperature, incorporating meteorological data and ground surface conditions. The study also explores the impact of civil infrastructure on permafrost thermal dynamics. © ASCE.

关键词： Permafrost

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Spatial Cluster Analysis of Land Seismicity in the Northem Part of Sumatra Using the K-Medoids Algorithm

Spatial Cluster Analysis of Land Seismicity in the Northem P...

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Information Technology and Computing (ICITCOM), International Conference on

作者： Hanifullah Hafidz Arrizal Marzuki Sinambela Widodo Suko Prayitno Adi Herri Trisna Frianto Undergraduate Program in Applied of Instrumentation Meteorology Climatology Geophysics STMKG Jakarta Indonesia Undergraduate Program in Applied of Geophysics STMKG Jakarta Indonesia Undergraduate Program in Applied of Electrical Engineering Politeknik Negeri Medan Medan Indonesia

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Identification of potential liquefaction in Kabonena 2

Identification of potential liquefaction in Kabonena

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2nd International Seminar on Science and Technology 2020, ISST-2 2020

作者： Badaruddin Abdullah Priambudi, M.D. Rusli, M. Labania, H.M.D. Rugayya, S. Asrafil Geophysics Engineering Study Program Tadulako University Indonesia Physics Study Program Tadulako University Indonesia Geology Study Program Tadulako University Indonesia

The research was conducted in Kabonena village, which aims to see the subsurface structure and the liquefaction potential. The research was conducted using the geoelectric resistivity method with the Wenner system. The parameters used are geological data, hydrogeology and formation values to obtain between the resistivity value and the lithology of the study area. Furthermore, by considering the geological, hydrogeological conditions and formation factor values, the specific resistance values for each layer are interpreted. The results obtained show that the layers with specific resistance values of 39.16 - 97.9 Ωm are dominated by water-saturated sand/gravel. The resistivity value above 97.9 - 200 Ωm is the layer of molasses and alluvium deposits/coastal deposits, and the resistance value above 200 Ωm is the layer of crushed granite and granodiorite. The existence of a subsurface structure like this, so that in Kelurahan Kabonena it is called a liquefaction event. The location has a layer of saturated air that points to the east with a depth of less than 24 meters. © Published under licence by IOP Publishing Ltd.

关键词： Hydrogeology

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AI Aided GPR Data Multipath Summation Using x-t Stacking Weights 47

AI Aided GPR Data Multipath Summation Using x-t Stacking Wei...

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47th International Conference on Telecommunications and Signal Processing, TSP 2024

作者： Nikos, Economou Sobhi, Nasir Said, Al Abri Al Shaqsi, Bader Hamdan, Hamdan School of Mineral Resources Engineering Technical University of Crete Applied Geophysics Lab Chania Greece Sultan Qaboos University College of Science Department of Earth Sciences Muscat Oman Sharjah University Petroleum Geosciences and Remote Sensing Program Department of Applied Physics and Astronomy United Arab Emirates

ISBN: (纸本)9798350365597

Migration velocity of Ground Penetrating Radar (GPR) data is a low wavenumber attribute crucial for migration. Obtaining a migration velocity model, which is considered closer to a Root Mean Square (RMS) model, from zero-offset (ZO) data requires analysis of the available diffractions whose density and (x, t) coverage is random. Thus, accuracy and efficiency of such a velocity model either for migration or its usage for interval velocity model estimation is not guaranteed. Here, with the aid of an Artificiaal Intelligence (AI) algorithm, which detects diffractions and usage of their kinematic information, we generate a diffraction velocity model used for the assignment of 2D weights for weighted multipath summation. The scope is to efficiently focus the scattered energy within a GPR section. We describe this methodology and demonstrate its application in enhancing the lateral continuity of reflections. We compare it with the multipath summation using lD weights with simulated data and present its application on marble assessment GPR data for imaging cracks in the subsurface structure. © 2024 IEEE.

关键词： Diffraction

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Refining the Regional Aftershocks Catalog of the Ambon Earthquake Mw 6.5 on 26 September 2019 using manual picking and a non-linear algorithm: Preliminary Result 9

Refining the Regional Aftershocks Catalog of the Ambon Earth...

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9th Asian Physics Symposium 2021, APS 2021

作者： Kamaruddin, B. Sahara, D.P. Halauwet, Y. Master Program of Geophysical Engineering Faculty of Mining and Petroleum Engineering Bandung Institute of Technology Indonesia Global Geophysics Research Group Faculty of Mining and Petroleum Engineering Bandung Institute of Technology Indonesia Earth Sciences Graduate Program Faculty of Earth Sciences and Technology Bandung Institute of Technology Indonesia Ternate Indonesia Ambon Indonesia

A destructive earthquake with magnitude Mw 6.5 occurred in Ambon, Indonesia, on 26 September 2019. This earthquake generated an aftershock sequence. In this study, we determined the location of the aftershock sequence using a non-linear algorithm from the Non-Linear Location (NonLinLoc) program. The catalog and waveform data were collected using 11 seismographs from BMKG regional network located around the Maluku archipelago. The data was recorded between 26 September and 18 October 2019. We have manually picked the P-and-S wave phase by using Seisgram2K software. In our preliminary result, we have located about 1,300 events of aftershock sequence with about 8,500 phases of P and S waves. Overall, the location of the focus depth of the aftershock sequence is dominantly distributed in between 5 - 25 km. Approximately ∼70% of the distribution of aftershock locations show a North-South (N-S) oriented pattern from west Seram to Ambon Islands. Meanwhile, about ∼20% of the aftershock's locations are distributed around Ambon Island. Our ongoing and future study is to determine accurate hypocentre location derived from double-difference hypocenter relocation with waveform cross-correlation. © Published under licence by IOP Publishing Ltd.

关键词： Location

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Non stretching NMO (Normal-Moveout) correction with DTW (Dynamic Time Warping) algorithm, study case: Shallow target seismic 1

Non stretching NMO (Normal-Moveout) correction with DTW (Dyn...

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1st South East Asia Science, Technology, engineering and Mathematics International Conference, SEA- STEM 2020

作者： Pebriana, L.V. Haris, A. Abdullah, A. Reservoir Geophysics Graduated Program Department of Physics Faculty of Mathematics and Natural Sciences University of Indonesia Jakarta10430 Indonesia Geology and Geophysics Program Faculty of Mathematics and Natural Sciences University of Indonesia Depok16424 Indonesia Geophysics Engineering Program Faculty Production and Exploration Technology Universitas Pertamina Jakarta12220 Indonesia

Normal Move Out (NMO) Correction using Common Mid-Point (CMP) data based on shallow target seismic. It has several problems for NMO correction. This constraint is caused by changes in extreme velocity gradients, resulting in less optimum value shallow target Common Mid-Point (CMP). The increased velocity causes a stretch in the Normal moveout (NMO) process which can reduce the S/N ratio. To minimize the stretch effect on NMO processing, we use a dynamic time warping algorithm analysis seismic signal with dynamic time warping algorithm based calculation time shift at time series sequence. The results of the NMO-DTW show that there is no change phase and frequency in the trace seismic with the far offset. Because algorithm calculation is based on the initial trace on CMP. © Published under licence by IOP Publishing Ltd.

关键词： Seismology

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Hypocenter Determination using a Non-Linear Method in Bali, Lombok, and Nusa Tenggara Regions: Preliminary Result 9

Hypocenter Determination using a Non-Linear Method in Bali, ...

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9th Asian Physics Symposium 2021, APS 2021

作者： Priyambada, F.R. Nugraha, A.D. Supendi, P. Master Program of Earth Sciences Faculty of Earth Sciences and Technology Institut Teknologi Bandung Bandung40132 Indonesia Global Geophysics Research Group Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Bandung40132 Indonesia Agency for Meteorology Climatology and Geophysics Jakarta10720 Indonesia

Bali, Lombok, and Nusa Tenggara are the region in the south of the Indonesia Archipelago. This region has relatively high seismicity due to subduction activity and faulting. The first step of the tomography study for inferring the geometry structure beneath Bali, Lombok, and Nusa Tenggara is to conduct precise hypocenter location. In this study, we used waveform data from the Indonesian Agency for Meteorology, Climatology, and geophysics (BMKG), which the study area is between 1120 - 1280 E and 40 - 130 S. Our preliminary results, we have re-picked 7,967 P-wave and 3,254 S-wave arrival times for 933 events in the period from January to March 2019. The non-linear method was conducted using the oct-tree sampling algorithm from the NLLoc program to determine the hypocenter's location. We also compared the results with BMKG catalog data. Our results show better clustering earthquakes with RMS error mostly close to zero and represent the geological structure in this region. The results show a shift in the location of the epicenters between 0.1 km to 1000 km, while for the focus depth between 0.006 - 500 km, with the azimuth shift being dominated to the northeast and southwest. The future and ongoing works, we will conduct a tomography study to imaging 3-D seismic velocity models beneath Bali, Lombok, and Nusa Tenggara regions using the fast-marching method. © Published under licence by IOP Publishing Ltd.

关键词： Tomography

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