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Vertical deformation model on postseismic phase using exponential and logarithmic function based on InSAR

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Geodesy and Geodynamics 2023年第4期14卷 392-400页

作者： Irma Yusiyanti Tattyana Wening Kalbuadi Prajardi Yofita Indah Saputri cecep Pratama Graduate School of Geodetic Engineering Universitas Gadjah MadaYogyakartaIndonesia Graduate School of Geomatics Engineering Universitas Gadjah MadaYogyakartaIndonesia Department of Geodetic Engineering Universitas Gadjah MadaYogyakartaIndonesia

The Palu MW7.4 earthquake occurred on September 28, 2018, with the epicenter at 119.86°, 0.72°. The severe shaking caused severe damage in Central Sulawesi, especially in Palu. We conducted a postseismic deformation study to determine the deformation pattern and reduce future earthquakes’ *** Synthetic Aperture Radar(In SAR) data were processed using Li CSBAS to get the time series. The time series data were fitted to exponential and logarithmic functions to determine the mechanism of postseismic deformation. The exponential model identified the influence of the viscoelastic mechanism, and the logarithm identified the afterslip mechanism. The Palu earthquake was fitted to logarithmic and exponential, but the logarithmic was more significant than an exponential *** mechanism predominates, and viscoelastic mechanisms play a minor role in this postseismic deformation.

关键词： Earthquake Deformation Postseismic Physical mechanism Exponential Logarithmic

Active tectonics of the eastern java based on a decade of recent continuous geodetic observation

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Geodesy and Geodynamics 2022年第4期13卷 376-385页

作者： Retno Eka Yuni Purwaningsih Adelia Sekarsari Tika Widya Sari cecep Pratama Sidik Tri Wibowo Graduate School of Geodetic Engineering Universitas Gadjah MadaYogyakartaIndonesia Department of Geodetic Engineering Universitas Gadjah MadaYogyakartaIndonesia Geospatial Information Agency CibinongIndonesia

The eastern part of Java Island is transversed by major faults such as Cepu,Blumbang,Surabaya,and Waru Segment,part of the Kendeng Fault,Wonsorejo Fault,Pasuruan Fault,and Probolinggo *** to the major fault,we used decomposition of identified fault from the Global Navigation Satellite System(GNSS)observation data to identify the potential of local *** analyzed surface deformation due to the effect of major fault using scaling law and elastic half-space *** investigated the possibility of unidentified fault using strain rates based on velocity vector data before and after correcting the effect of a major *** found that strain calculation for principal strain value in the eastern part of Java Island is less than one microstrain/year and the dominant one with a compression pattern due to the Sunda subduction *** maximum shear strain rate value goes from 0.002 to 0.094 microstrain/year,and the dilatation rate value ranges from-0.141 to 0.038 microstrain/year,which correlates with the reverse of the Kendeng Fault.A higher compression pattern outside the major fault in a differential maximum shear strain rate might indicate a local fault.

关键词： GPS Fault Deformation Strain Java Active tectonics

Anomaly detection on displacement rates and deformation pattern features using tree-based algorithm in Japan and Indonesia

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Geodesy and Geodynamics 2023年第2期14卷 150-162页

作者： Adi Wibowo Satriawan Rasyid Purnama cecep Pratama Leni Sophia Heliani David P.Sahara Sidik Tri Wibowo Department of Informatics Universitas Diponeegoro UniversitySemarangIndonesia Department of Geodetic Engineering Universitas Gadjah MadaYogyakartaIndonesia Global Geophysics Research Group Faculty of Mining and Petroleum EngineeringInstitute of Technology BandungBandungIndonesia Geospatial Information Agency Indonesia

Research on strain anomalies and large earthquakes based on temporal and spatial crustal activities has been rapidly growing due to data availability, especially in Japan and Indonesia. However, many research works used local-scale case studies that focused on a specific earthquake characteristic using knowledgedriven techniques, such as crustal deformation analysis. In this study, a data-driven-based analysis is used to detect anomalies using displacement rates and deformation pattern features extracted from daily global navigation satellite system(GNSS) data using a machine learning algorithm. The GNSS data with188 and 1181 continuously operating reference stations from Indonesia and Japan, respectively, are used to identify the anomaly of recent major earthquakes in the last two decades. Feature displacement rates and deformation patterns are processed in several window times with 2560 experiment scenarios to produce the best detection using tree-based algorithms. Tree-based algorithms with a single estimator(decision tree), ensemble bagging(bagging, random forest and Extra Trees), and ensemble boosting(AdaBoost, gradient boosting, LGBM, and XGB) are applied in the study. The experiment test using realtime scenario GNSSdailydatareveals high F1-scores and accuracy for anomaly detection using slope windowing 365 and 730 days of 91-day displacement rates and then 7-day deformation pattern features in tree-based algorithms. The results show the potential for medium-term anomaly detection using GNSS data without the need for multiple vulnerability assessments.

关键词： Anomaly GNSS Displacement rates Deformation pattern Tree-based algorithm

Spatiotemporal variation of vertical displacement driven by seasonal hydrological water storage changes in Kalimantan, Indonesia from GPS observation

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Geodesy and Geodynamics 2020年第5期11卷 350-357页

作者： Leni Sophia Heliani cecep Pratama Danardono Nurrohmat Widjajanti Eko Hanudin Department of Geodetic Engineering Universitas Gadjah MadaYogyakartaIndonesia Oceanic Resource and Technology Research Center Universitas Gadjah MadaYogyakartaIndonesia Mathematics Department Faculty of Natural ScienceUniversitas Gadjah MadaYogyakartaIndonesia Soil Science Department Faculty of AgricultureUniversitas Gadjah MadaYogyakartaIndonesia

The Global Positioning System(GPS) Indonesian Continuously Operating Reference Stations(InaCORS)network has been used for various applications ranging from land administration to *** dynamic process plays a significant role in almost all Indonesia regions except in Kalimantan Island since it’s located on the stable continental plate. Therefore, the study of deformation in an area with less tectonic activities would be relatively simple to elucidate another terrestrial process. Here, we analyzed the deformation process in Kalimantan Island using continuous geodetic observation. We found that vertical displacement shows oscillation signals which are related to the hydrological cycle of water storage changes. Along with the GPS data, we utilized rain precipitation data to analyze both spatial and temporal variation of vertical displacement to support the hypothesis of elastic response to the load of water mass variations. Finally, we emphasized that continuous GPS observation in Kalimantan is reliable for detecting seasonal hydrological water storage changes.

关键词： seasonal Island terrestrial

Shelf life evaluation of formulated cookies from Hanjeli (Coix lacryma-jobi L.) and Moringa leaf flour (Moringa oleifera)

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Food Bioscience 2022年第3期47卷 1351-1357页

作者： Ade Chandra Iwansyah Dwi Melanie Wisnu Cahyadi Anastasia Wheni Indraningsih Yuniar Khasanah Ashri Indriati Raden cecep Erwan Andriansyah Hazrulrizawati Abd Hamid Izzah Hayati Yahya Research Center for Food Technology and Processing National Research and Innovation AgencyIndonesia.Jl.Jogja-Wonosari Km 315 Playen KabGunungkidulYogyakarta55861Indonesia Department of Food Technology Faculty of EngineeringPasundan UniversityJl Dr.Setiabudi No.193BandungWest Java4b 0153Indonesia Research Center for Appropriate Technology National Research and Innovation AgencyIndonesia.Jl.K.S.Tubun No.5 Subang41213West JavaIndonesia Faculty of Industrial Sciences and Technology Universiti Malaysia PahangLebuhraya Tun Razak26300GambangKuantanMalaysia

Hanjeli(Coix lacryma-jobi L.)and moringa leaf(Moringa oleifera)remain underutilised despite their high nutritional value for *** the present research,cookies made from hanjeli(Coix lacryma-jobi L.)with moringa leaf flour(Moringa oleifera)have been *** cookies were measured for nutritional composition and shelf life *** shelf life evaluation of hanjeli-moringa cookies was calculated using two approaches,which were accelerated shelf life testing(ASLT)methods with critical moisture content and the Arrhenius *** results of the nutritional composition analysis showed that hanjeli-moringa cookies contain protein(9.14%),fat(24.67%),carbohydrates(61.62%),crude fibre(4.85%),and energy(505.01 Kcal).Using the Arrhenius method,the shelf life of hanjeli-moringa cookies was 95.46 days at room temperature and 97.63 days at 20℃.Meanwhile,the shelf life of cookies using the critical moisture content approach was 170.57 *** life is influenced by initial moisture content,critical water content of the product,packaging surface area and permeability,saturated vapour pressure,and slope sorption isotherm *** formulated cookies have significant amounts of nutrients that are acceptable and safe for consumption,with guaranteed desirable sensory *** result of this study shows that hanjeli-moringa cookies can be used as an alternative food for people who need high energy in a practical way of serving or ready to eat.

关键词： Coix lacryma-jobi Moringa oleifera Cookies Functional food Shelf life

Present-day crustal deformation revealed active tectonics in Yogyakarta,Indonesia inferred from GPS observations

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Geodesy and Geodynamics 2020年第2期11卷 135-142页

作者： Nurrohmat Widjajanti cecep Pratama Parseno T.Aris Sunantyo Leni Sophia Heliani Bilal Ma’ruf Dedi Atunggal Dwi Lestari Hilmiyati Ulinnuha Arinda Pinasti Riska Fajrul Ummi Department of Geodetic Engineering Universitas Gadjah MadaYogyakartaIndonesia Graduate School of Geomatics Engineering Universitas Gadjah MadaYogyakartaIndonesia

We investigated the active crustal structure in Yogyakarta,Indonesia,using new and denser Global Positioning System(GPS)*** rate estimated from five years(2013-2018)of observations on 22 campaign might record broad deformation after the 2006 Mw7.8 Java tsunami earthquake and postseismic transient due to the 2006 Mw6.3 Yogyakarta *** conducted a decomposition method to obtain a short wavelength feature by removing those postseismic deformations from the observation *** short wavelength pattern revealed active tectonics indicating a combination of E-W dip-slip motion and N-S left-lateral structure.A large maximum shear strain rate(>0.1 microstrain/yr)was estimated along the Opak fault while a large dilatation rate(<-0.1 microstrain/yr)was estimated around the Bantul *** analysis result indicates important implications for crustal dynamics and assessing future seismic hazards potential in the Yogyakarta region.

关键词： Fault GPS Deformation Strain