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Recent Geodesy and Geodynamics Articles

Recently published articles from Geodesy and Geodynamics.

Characterisation and mapping of land subsidence based on geodetic techniques data in Lagos, Nigeria

Available online 25 March 2020
Ikuemonisan Femi Emmanuel | Ozebo Vitalis Chidi

The pervasive seasonal flooding, aquifer contamination, and saline water intrusion in parts of Lagos are some of the long-term effects of land subsidence caused by the excessive groundwater exploitation...

Earth Core's stresses variation in Central Asian earthquakes region

Available online 24 March 2020
Ikram Atabekov

Tectonic stresses of Central Asia (limited by geographic coordinates 36–46°N, 56–76° E) over the recent times are modeled based on moment elasticity, taking into account the focal mechanism of earthquakes....

Local geoid height approximation and interpolation using moving least squares approach

Available online 24 March 2020
M. Kiani

In this paper an introduction of the moving least squares approach is presented in the context of data approximation and interpolation problems in Geodesy. An application of this method is presented...

Determination of Istanbul geoid using GNSS/levelling and valley cross levelling data

Available online 19 March 2020
Müge Albayrak | Mustafa Tevfik Özlüdemir | Mohammad Mohseni Aref | Kerem Halicioglu

The Istanbul GPS Triangulation Network (IGTN) and the Istanbul Levelling Network (ILN), established in 2006, provide data for the determination of a local GNSS/levelling geoid model. These networks'...

Kinematics of faults in Bengal Basin: Constraints from GPS measurements

Available online 19 March 2020
Mallika Mullick | Dhruba Mukhopadhyay

The crustal deformation of Bengal Basin is constrained by motion on faults within the basin and those along the basin boundaries on all sides except the southern margin. Eocene Hinge Zone (EHZ), the...

Template-based smoothing functions for data smoothing in Geodesy

Available online 18 March 2020
M. Kiani

This paper is aimed at the derivation of a discrete data smoothing function for the discrete Dirichlet condition in a regular grid on the surface of a spheroid. The method employed here is the local...

Real data extraction process and procedure of geophysical exploration profile

In this paper, we present an open python procedure with Jupyter notebook, for data extraction and vectorization of geophysical exploration profile. Constrained by observation routes and traffic conditions,...

Possible precursory anomalies in ground water level associated with the Wenchuan Ms 8.0 earthquake in 2008, Sichuan, China

Available online 12 March 2020
Chenglong Liu | Guangcai Wang | Zheming Shi | Dan Zhao | Hui Zhang

We have examined the water level data from 16 wells in Sichuan province, China, recorded before the Wenchuan Ms8.0 earthquake occurred in 2008. We found that the data of 5 among these wells exhibit...

The rigorous adjustment of the global mean sea level budget during 2005–2015

Available online 12 March 2020
H. Bâki Iz | T.Y. Yang | C.K. Shum

Global mean sea level budget is rigorously adjusted during the period 2005–2015. The emphasis is to provide the best estimates for the linear rates of changes (trends) of the global mean sea level budget...

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

We investigated the active crustal structure in Yogyakarta, Indonesia, using new and denser Global Positioning System (GPS) data. Deformation rate estimated from five years (2013–2018) of observations...

Research on background noise level of vertical pendulum tiltmeter in China

Available online 12 March 2020
Ying Zhao

By using the observation data of the vertical pendulum tiltmeter in China, the influence of different sampling rates on the results of power spectral density is studied, and the background noise level...

Determination of NavIC differential code biases using GPS and NavIC observations

Available online 31 January 2020
K. Siva Krishna | D. Venkata Ratnam

Delay bias between the pseudo range code is called Differential Code Bias (DCB), this is one of the main error sources to estimate the precise Total Electron Content (TEC) in ionosphere. Differential...

Surface seasonal mass changes and vertical crustal deformation in North China from GPS and GRACE measurements

January 2020
Shuya Li | Wenbin Shen | Yuanjin Pan | Tengxu Zhang

The Earth is an elastic body, and the surface mass loading changes will lead to elastic loading deformation on the surface of the Earth. In this study, we investigated the surface seasonal mass changes...

A tectonic geodesy mapping software based on QGIS

January 2020
Zhe Fang | Guoyan Jiang | Caijun Xu | Shuai Wang

To overcome the high cost of learning, non-visual operation, and cumbersome steps of fine-tuning map elements in Generic Mapping Tools (GMT) and other geoscience mapping softwares, we present the Tectonic...

Useful predictions ahead of large earthquakes and lessons learned for future progress

January 2020
Ragnar Stefánsson

A significant basis for this article is the outcome of 4 multinational research projects which were carried out in South-West Iceland from 1988–2006, focusing on crustal processes that preceded two...

On the realization of seismic microzonation of Almaty (Kazakhstan) in ground accelerations based on the “continual” approach

January 2020
N.V. Silacheva | U.K. Kulbayeva | N.A. Kravchenko

Seismic microzonation for Almaty city for the first time use probabilistic approach and hazard is expressed in terms of not only macroseismic intensity, but also Peak Ground Acceleration (PGA). To account...

Crustal thickness beneath Atlas region from gravity, topographic, sediment and seismic data

January 2020
Franck Eitel Kemgang Ghomsi | Robert Tenzer | Sévérin Nguiya | Animesh Mandal | Robert Nouayou

The Atlas region in northwest Africa is characterized by the Quaternary volcanism and elevated topography with past complex tectonic mitigation between the African and European plates. Geodynamics of...

Excitations of length-of-day seasonal variations: Analyses of harmonic and inharmonic fluctuations

January 2020
Jiesi Luo | Wei Chen | Jim Ray | Jiancheng Li

Geophysical excitations of length-of-day (LOD) variations is of great significance in understanding changes in the Earth's spin rate and interactions between geophysical fluids and the solid Earth,...

A study of clock effects in Newton–Maxwell formalism

January 2020
Sankar Hajra

Many measurements on the time gain/loss of the atomic clocks orbiting the spinning Earth have been done. The time gain/loss of the atomic clocks orbiting the spinning Earth is called gravitomagnetic...

Positioning performance analysis on combined GPS/BDS precise point positioning

January 2020
Jing Xiong | Fei Han

Combining the observation data from five Multi-GNSS Experiment (MGEX) stations with the precise orbit and clock products from Global Positioning System (GPS) and BeiDou Navigation Satellite System (BDS),...

Sensitivity analysis of ground motion prediction equation using next generation attenuation dataset

January 2020
Sina Sabermahani | Parisa Ashjanas

Seismic hazard assessment is an important stage in earthquake engineering. Since the ground motion prediction equation (GMPE) has a key role in seismic hazard assessment, it is necessary to determine...

Temporal variations of the ionospheric disturbances due to the seasonal variability over Turkey using IONOLAB-FFT algorithm

Available online 6 January 2020
Secil Karatay

The ionosphere is exposed to forcing from below due to gravitational, geomagnetic and seismic activities, and above due to solar wind. These forces cause some medium and large scale irregularities and...

Comparison of TEC prediction methods in mid-latitudes with GIM maps

Available online 31 December 2019
Olga Maltseva | Galina Glebova

There are many long-term and short-term prediction methods of Total Electron Content (TEC) that need to be tested for each specific region. Recently, much attention has been paid to testing TEC models...

Using satellite altimetry leveling to assess the marine geoid

Available online 9 December 2019
Zhengtao Wang | Nengfang Chao | Dingbo Chao

Based on the concept of Global Position System (GPS)/leveling, the satellite altimetry leveling (SAL) is first proposed to evaluate the marine geoid. SAL is derived by the difference among the mean...

Performance evaluation of neural network TEC forecasting models over equatorial low-latitude Indian GNSS station

Available online 7 December 2019
G. Sivavaraprasad | V.S. Deepika | D. SreenivasaRao | M. Ravi Kumar | M. Sridhar

Global Positioning System (GPS) services could be improved through prediction of ionospheric delays for satellite-based radio signals. With respect to latitude, longitude, local time, season, solar...

Influencing factors on the accuracy of local geoid model

Different modification methods and software programs were developed to obtain accurate local geoid models in the past two decades. The quantitative effect of the main factors on the accuracy of local...

Low-degree toroidal modes from the Sumatra-Andaman event observed by superconducting gravimeters

The complex frequencies of the low-degree toroidal modes are helpful in constraining the mantle structure. In the early years, the traditional method to detect the low-degree toroidal modes is seismic...

Electromagnetic monitoring in the region of seismic activization (on the Gorny Altai (Russia) example)

November 2019
N.N. Nevedrova | A.M. Sanchaa | A.E. Shalaginov | S.M. Babushkin

Based on the analysis of the field data of nonstationary electromagnetic soundings with different installations, the evolution of the stressed state of the geological massif in the epicentral region...

Hydrological mass variations in the Nile River Basin from GRACE and hydrological models

November 2019
Mostafa Abd-Elbaky | Shuanggen Jin

Terrestrial water storage (TWS) change is a key component of the global water cycle and hydrologic cycle. Therefore, it is of significance to quantify TWS variations at large scale and understand how...

The formation bulk density prediction for intact and fractured siliciclastic rocks

November 2019
Babatunde Yusuf | Olalere Oloruntobi | Stephen Butt

The formation bulk density is one of the most important rock properties required for reservoir evaluation and geomechanical analysis. In intervals where the formation bulk density logs are not acquired,...

Anomalies identification of Earth's rotation rate time series (2012–2017) for possible correlation with strong earthquakes occurrence

November 2019
Fabrizio Ambrosino | Lenka Thinová | Miloš Briestenský | Carlo Sabbarese

The analysis of the Earth's rotation rate time series, from January 1,2012 till December 31,2017, is performed using two different time series analysis methods, both based on signal decomposition joined...

The progress of laser ranging technology at Shanghai Astronomical Observatory

As an important station of International Laser Ranging Service (ILRS), Shanghai Astronomical Observatory (SHAO) has upgraded Satellite Laser Ranging (SLR) system with high repetition rate and achieved...

Development and prospect of mobile gravity monitoring and earthquake forecasting in recent ten years in China

November 2019
Yiqing Zhu | Fang Liu | Guoqing Zhang | Yunma Xu

After the Wenchuan earthquake in 2008, China Earthquake Administration has strengthened the monitoring of mobile gravity and earthquake forecasting. This paper mainly analyzes the development of mobile...

The subduction of the Copiapó aseismic ridge, is the causing of the formation of metallic minerals deposits in north of Chile and Argentina?

The results obtained in this work evince that the metallic mineral deposits located in the northern region of the Chilean-Pampean flat slab (in northern Chile and north-western Argentina), at approximately...

Optimum choice of parameters and numerical schemes for a regional gravimetric Moho recovery

November 2019
Samurdhika Rathnayake | Robert Tenzer

Despite practical limitations of isostatic theories to model the Moho geometry are well-known, gravimetric methods are often used in terrestrial studies of crustal structure in regions with a low seismic...

A numerical model for the gravimetric recovery of sub-lithospheric mantle structures

Available online 19 November 2019
Robert Tenzer

It is a well-known fact that the long-wavelength terrestrial geoid undulations are mainly attributed to deep mantle density heterogeneities, while more detailed features in the geoid geometry are associated...

Remote sensing ionospheric variations due to total solar eclipse, using GNSS observations

Available online 1 October 2019
Mohamad Mahdi Alizadeh | Harald Schuh | Saeed Zare | Sahar Sobhkhiz-Miandehi | Lung-Chih Tsai

For years great interest has been taken in the effects of physical phenomena on ionosphere structure. A total solar eclipse was visible in North America on August 21st, 2017. This event offered a great...

Satellite gravimetry and mass transport in the earth system

September 2019
Jianli Chen

Since launched in March 2002, the Gravity Recovery and Climate Experiment (GRACE) satellite gravity mission has brought a new era to the studies of large-scale mass transport and redistribution within...

Reassessment of electromagnetic core-mantle coupling and its implications to the Earth's decadal polar motion

September 2019
Weijia Kuang | Benjamin F. Chao | Jianli Chen

The observed Earth's polar motion on decadal time scales has long been conjectured to be excited by the exchange of equatorial angular momentum between the solid mantle and the fluid outer core, via...

Crustal density structure of the southern segment of the Liaocheng-Lankao fault, China

The 1:200,000 middle-large scale Bouguer gravity anomaly data covering the southern segment of the Liaocheng-Lankao fault (SLLF) and its vicinity are analyzed with two methods. First, the Bouguer gravity...

Effects of generally anisotropic crustal rocks on fault-induced displacement and strain fields

September 2019
E. Pan | W.A. Griffith | H. Liu

We present a new solution for the elastic displacement and strain fields on or near Earth's surface due to rectangular faults in an anisotropic half-space, expressed as a summation of (A) the solution...

Houston16: A stable geodetic reference frame for subsidence and faulting study in the Houston metropolitan area, Texas, U.S.

Houston, Texas, is one of the earliest regions to employ continuous GPS technology for land subsidence monitoring. Currently, there are over 200 permanent GPS stations located in the greater Houston...

Crustal extension in North China since the Mesozoic: A numerical study

September 2019
Feng Lin | Mian Liu

The ∼1.8 billion years old North China Craton (NCC) has been thermally rejuvenated during the Mesozoic, experiencing two major phases of crustal extension and volcanism since then. The earlier phase...

Sedimentary structure of the western Bohai Bay basin and other basins in North China revealed by frequency dependent P-wave particle motion

September 2019
Chenhao Yang | Fenglin Niu

High-resolution seismic models of sediment basins are critical inputs for earthquake ground motion prediction and petroleum resource exploration. In this study we employed a newly developed technique...

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