Deformation analysis of Aceh April 11th 2012 earthquake using GPS observation data

2015 ◽  
Author(s):  
Putra Maulida ◽  
Irwan Meilano ◽  
Dina A. Sarsito ◽  
Susilo
Keyword(s):  
Deformation Analysis ◽  
Observation Data ◽  
Gps Observation

Deformation analysis in the East Nusa Tenggara and Banda Islands based on GPS observation from 2010-2015

2017 ◽  
Author(s):  
Giovanni Cynthia Pradipta ◽  
Irwan Meilano ◽  
Endra Gunawan ◽  
Joni Efendi
Keyword(s):  
Deformation Analysis ◽  
Banda Islands ◽  
Gps Observation

scholarly journals Analisis Total Electron Content (TEC) Menggunakan Continous Wavelet Transform Sebagai Indikator Prekursor Gempa Bumi Di Wilayah Provinsi Bengkulu

2019 ◽  
Vol 9 (2) ◽  
pp. 27-33
Author(s):  
Laksamana Agung Aprillo ◽  
Hendy Santosa ◽  
Faisal Hadi
Keyword(s):  
Wavelet Transform ◽  
Standard Deviation ◽  
Total Electron Content ◽  
Electromagnetic Waves ◽  
Electron Content ◽  
Observation Data ◽  
Dual Frequency ◽  
Total Electron ◽  
Gps Observation ◽  
Large Earthquakes

ABSTRACT Bengkulu is one of 34 provinces in Indonesia which is a megathrust region. So Bengkulu province is often hit by many large earthquakes with shallow depth. TEC anomaly was analyzed based on three electromagnetic waves radiated by an earthquake. The total electron content (TEC) anomaly is seen through the global positioning system (GPS) dual-frequency radio signal data. The continuous wavelet transform (CWT) method is used to divide the signal analysis into several sections according to the electromagnetic wave frequency range of acoustic (2.5 mHz) -3 mHz), gravity waves (1 mHz-2.8 mHz) and rayleigh waves (5 mHz-33 mHz). GPS observation data for 9 days is calculated using the Standard deviation (2?) method to see trends in data changes. The analysis shows anomalies in the September 12 2007 earthquake (7.9 Mw), the March 5 2010 earthquake (6.3 Mw) and the August 4 2011 earthquake (6.0 Mw). Anomalies are detected 1 to 5 hours before an earthquake occurs. TEC anomalies that occur may be related to the process of preseismic before the earthquake and may be an early sign of an earthquake.Keyword: earthquake, total electron content, continous wavelet transform, standard deviation

scholarly journals VELOCITY CHANGES ANALYSIS DISPLACEMENT DATA USING GNSS (GLOBAL NAVIGATION SATELLITE SYSTEM) IN JATI GEDE DAM

2017 ◽  
Vol 17 (1) ◽  
pp. 1
Author(s):  
Aning - Haryati
Keyword(s):  
Earth Tide ◽  
Fish Farming ◽  
Satellite System ◽  
Observation Point ◽  
Deformation Analysis ◽  
Effect Of Water ◽  
The North ◽  
Gps Observation ◽  
Global Navigation Satellite ◽  
Gps Station

Jati Gede Dam is located around the border of Sumedang-Majalengka region in West Java province. Jati Gede Dam provides several benefits such as for irrigation, hydropower, tourism and fish farming. Dam can also trigger the potential a disaster, especially in the water impounding process. The process of water impounding in the dam has the potential to cause earthquake disaster. The effect of water impounding potentially adds stress accumulation in the dam area so that it can cause earthquakes. Therefore, a research on strain change due to the water impounding in Jati Gede dam is needed. The method used in the research is by GPR survey. Result from GPS observation processed to generate displacement value of GPS observation point, and strain changes from the point that formed grid strain. Based on deformation analysis the effect of water impounding to the strain around Jati Gede Dam can be obtained. Development in this thesis is by using and additional method namely Kinematic PPP to see the different pattern of earth tide phenomenon around the dam which were represented by several GPS station. These results indicate a change of velocity direction in the area around Jati Gede dam. This change can be analyzed for the station near the dam as JTG1 station, jtg2, CSUM, 0355, BDK2, CJR6, and MJLK. BDK2 campaign point leads toward the Southwestern, CJR6 displacements from the Southwest to the North, MJLK displacements from Southeast to the Northwest, and 0355 displacements from Southeast to the North. JTG1 GPS station point tends to lead toward the Southwestern and JTG2 GPS station leads toward the North with 0355 GPS station. CSUM in Sumedang displacements from Northwest to the East. This change can be analyzed for the station near the dam such as JTG1, JTG2, CSUM, 0355, BDK2, CJR6, and MJLK as result of the process of water filling in Jati Gede dam.   

Inversion Methods for Ionospheric Occultation from GPS Observation Data

2004 ◽  
Vol 47 (4) ◽  
pp. 660-666 ◽  
Author(s):  
Zhen ZENG ◽  
Xiong HU ◽  
Xun-Jie ZHANG ◽  
Wei-Xing WAN
Keyword(s):  
Observation Data ◽  
Inversion Methods ◽  
Gps Observation

scholarly journals Contemporary crustal tectonic movement in the southern Sichuan-Yunnan block based on dense GPS observation data

2019 ◽  
Vol 3 (1) ◽  
pp. 53-61 ◽  
Author(s):  
HongLin Jin ◽  
◽  
Yuan Gao ◽  
XiaoNing Su ◽  
GuangYu Fu ◽  
...  
Keyword(s):  
Observation Data ◽  
Tectonic Movement ◽  
Gps Observation ◽  
Block Based

The Analysis of Solar Storms’ Influence on GPS Measurement Errors

2014 ◽  
Vol 568-570 ◽  
pp. 90-95
Author(s):  
Li Ying Cao ◽  
Gui Wen Lan
Keyword(s):  
Measurement Errors ◽  
Measurement Precision ◽  
Observation Data ◽  
Dual Frequency ◽  
Gps Measurement ◽  
Gps Observation ◽  
Solar Storms ◽  
Frequency Observation ◽  
Observation Period ◽  
Made In

This paper mainly analyzes the effects of solar storms on GPS measurement errors. Solar storms produce a lot of charged particles, which makes the electron density in ionosphere increase, and in further affects the ionosphere delay errors. Ionosphere delay errors are one of the main sources of GPS measurement error, which is a direct impact on measurement precision of GPS. GPS distance errors are caused by ionosphere delay errors. In the case of solar storms, dual frequency observation cannot completely remove ionosphere delay, so in measurement process appropriate methods will be used to reduce errors in GPS measurement, for example, during the observation in the night and increased observation period. By comparing and analyzing the GPS observation data in solar storms and under normal conditions with GAMIT/GLOBK software, a conclusion is made in this paper that observing in the night and the increased observation period can reduce the GPS measurement errors.

Analysis and Study on GNSS Data in the Three Gorges Area

2014 ◽  
Vol 522-524 ◽  
pp. 1171-1177
Author(s):  
Zhi Ge Jia ◽  
Gang Liu ◽  
Wei Wang
Keyword(s):  
Three Gorges Reservoir ◽  
Deformation Monitoring ◽  
Three Gorges Reservoir Area ◽  
Deformation Analysis ◽  
Observation Data ◽  
Vertical Deformation ◽  
Three Gorges ◽  
Structure Variation ◽  
The Three Gorges Reservoir ◽  
The Three Gorges

This paper first introduces geological background of the Three Gorges Reservoir and then reviews composition of the Three Gorges GNSS deformation monitoring network. The GNSS monitoring strategy from 2010 to 2012 is elaborately analyzed from technology design, field observation, data processing and deformation analysis. vertical deformation showed a subsidence trend in around the dam and near the Yangtze River，Vertical deformation showed a uplifting trend in TG14 station and TG13station. The results show that the three-year’s variation of the crustal deformation is small, and then the surface structure variation is stable in present around the Three Gorges Reservoir area.

Dam Deformation Analysis Based on Independent Component Analysis

2012 ◽  
Vol 212-213 ◽  
pp. 859-862
Author(s):  
Xin Wu Zhan ◽  
Wu Jiao Dai
Keyword(s):  
Independent Component Analysis ◽  
Component Analysis ◽  
Deformation Monitoring ◽  
Independent Component ◽  
Deformation Analysis ◽  
Blind Signal Separation ◽  
Observation Data ◽  
Blind Signal ◽  
Dam Deformation ◽  
The Stability

Independent component analysis (ICA) is a recent and well-known technique used to separate mixtures of signals. It can separate independent components from mixed signals and has many advantages in blind signal separation, redundancy removal and processing of frequency aliasing problems. Deformation monitoring data can be regarded as the digital signals series which is composed of different frequency. After making test on ICA in processing dam observation data we can draw a conclusion that it is practical and applicative for ICA to evaluate the stability of the dam and reflect the working condition of dam.

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