The structure of consolidated crust of the Yakutian diamondiferous province - Northern pert: evidence from geophysical investigations

2019 ◽  
Keyword(s):  
Consolidated Crust ◽  
Geophysical Investigations

scholarly journals RESULTS OF GEOPHYSICAL INVESTIGATIONS ON ADYGEYA PROFILE

2014 ◽  
Author(s):  
А.Г. Шемпелев ◽  
С.У. Кухмазов ◽  
В.Б. Заалишвили ◽  
Л.Н. Невский
Keyword(s):  
Greater Caucasus ◽  
Entire Structure ◽  
Consolidated Crust ◽  
Scythian Plate ◽  
Geophysical Surveys ◽  
Central Caucasus ◽  
Geophysical Investigations

В последние годы несколькими организациями были выполнены геофизические исследования различными методами в западной части Центрального Кавказа. Вдоль Адыгейского профиля (Дагомыс-Абадзехская-Гиагинская) впервые получена комплексная геофизическая характеристика глубинного разреза земной коры вкрест всей структуры Большого Кавказа. Рассматриваются материалы МТЗ, МОВЗ и гравимагнитных съёмок. Предполагается, что структура Большого Кавказа, как часть Альпийского коллизонного пояса, возникла при наползании Скифской эпигерцинской плиты на консолидированную кору одной из закавказских микроплит In recent years, several organizations have been implemented geophysical surveys in the western part of the Central Caucasus using a variety of methods. Along the Adygeya profile (Dagomys-Abadzekhskaya- Giaginskaia) were received a comprehensive geophysical characteristics of deep crustal section across the entire structure of the Greater Caucasus. Examines material МТZ, IGAD and gravimagnetsurvey. The structure of the Greater Caucasus, as part of the Alpine collision belt, appeared with creeping of the Scythian plate on one of the Caucasuss consolidated crust microplate

scholarly journals Geophysical investigations for stability and safety mitigation of regional crude-oil pipeline near abandoned coal mines

2021 ◽  
Vol 18 (1) ◽  
pp. 145-162
Author(s):  
B Butchibabu ◽  
Prosanta Kumar Khan ◽  
P C Jha
Keyword(s):  
High Resolution ◽  
Crude Oil ◽  
Seismic Refraction ◽  
High Resolution Imaging ◽  
Weak Zone ◽  
Near Surface ◽  
Oil Pipeline ◽  
Refraction Tomography ◽  
Geophysical Investigations ◽  
Resolution Imaging

Abstract This study aims for the protection of a crude-oil pipeline, buried at a shallow depth, against a probable environmental hazard and pilferage. Both surface and borehole geophysical techniques such as electrical resistivity tomography (ERT), ground penetrating radar (GPR), surface seismic refraction tomography (SRT), cross-hole seismic tomography (CST) and cross-hole seismic profiling (CSP) were used to map the vulnerable zones. Data were acquired using ERT, GPR and SRT along the pipeline for a length of 750 m, and across the pipeline for a length of 4096 m (over 16 profiles of ERT and SRT with a separation of 50 m) for high-resolution imaging of the near-surface features. Borehole techniques, based on six CSP and three CST, were carried out at potentially vulnerable locations up to a depth of 30 m to complement the surface mapping with high-resolution imaging of deeper features. The ERT results revealed the presence of voids or cavities below the pipeline. A major weak zone was identified at the central part of the study area extending significantly deep into the subsurface. CSP and CST results also confirmed the presence of weak zones below the pipeline. The integrated geophysical investigations helped to detect the old workings and a deformation zone in the overburden. These features near the pipeline produced instability leading to deformation in the overburden, and led to subsidence in close vicinity of the concerned area. The area for imminent subsidence, proposed based on the results of the present comprehensive geophysical investigations, was found critical for the pipeline.

scholarly journals Magnetometer data from the GRACE satellite duo

2021 ◽  
Vol 73 (1) ◽  
Author(s):  
Nils Olsen
Keyword(s):  
Mean Squared Error ◽  
Incident Angle ◽  
Magnetic Data ◽  
Grace Data ◽  
Magnetometer Data ◽  
Geophysical Investigations ◽  
Grace Satellites ◽  
Grace Satellite ◽  
The Difference ◽  
Grace Mission

AbstractThis paper describes and discusses the preprocessing and calibration of the magnetic data taken by the navigational magnetometers onboard the two GRACE satellites, with focus on the almost 10 years period from January 2008 to the end of the GRACE mission in October 2017 for which 1-Hz magnetic data are available. A calibration of the magnetic data is performed by comparing the raw magnetometer sensor readings with model magnetic vector values as provided by the CHAOS-7 geomagnetic field model for the time and position of the GRACE data. The presented approach also accounts for magnetic disturbances produced by the satellite’s magnetorquer and for temperature effects, which are parametrized by the Sun incident angle. The root-mean-squared error of the difference between the calibrated data and CHAOS-7 model values is about 10 nT, which makes the GRACE magnetometer data relevant for geophysical investigations.

Geophysical investigations of the Stuoragurra postglacial fault, Finnmark, northern Norway

1992 ◽  
Vol 29 (2) ◽  
pp. 95-118 ◽  
Author(s):  
Odleiv Olesen ◽  
Herbert Henkel ◽  
Ole Bernt Lile ◽  
Eirik Mauring ◽  
Jan Steinar Rønning
Keyword(s):  
Northern Norway ◽  
Geophysical Investigations
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