On Seismogram Types and Focal Depth of Earthquakes in the North Japan and Manchuria Region. Eijo VesanenOn the Gravity Field and the Isostatic Structure of the Earth's Crust in the East Alps. Paavo E. Holopainen

1948 ◽  
Vol 56 (3) ◽  
pp. 248-249
Author(s):  
M. King Hubbert
Keyword(s):  
Gravity Field ◽  
Focal Depth ◽  
Earth’S Crust ◽  
The North ◽  
Earth's Crust

scholarly journals IV.—The Glacial Deposits of Northern Pembrokeshire

1906 ◽  
Vol 41 (1) ◽  
pp. 53-87
Author(s):  
T. J. Jehu
Keyword(s):  
Igneous Rocks ◽  
Earth’S Crust ◽  
The West ◽  
Great Abundance ◽  
Glacial Deposits ◽  
North East ◽  
The North ◽  
Earth's Crust

The area embraced in this paper consists of that part of Pembrokeshire which lies to the north and north-east of St Bride's Bay. Bounded on the west by St George's Channel and on the north by Cardigan Bay, it extends to the north-east as far as the mouth of the river Teifi, near Cardigan.That part of the country which lies in the immediate neighbourhood of St David's has, through the laborious researches of the late Dr Hicks and others, become well-known to geologists, and may now be regarded as classic ground. The solid geology of this promontory has given rise to much discussion, and has, perhaps, attracted more attention than that of any other part of the Principality. The reason for this great interest is to be sought in the facts that the rocks of this area are of a very great antiquity, and that the sedimentary series contain the remains of some of the earliest organic forms yet found in the earth's crust, whilst the igneous rocks are also displayed in great abundance and variety, and present us, in the words of Sir Archibald Geikie, with “the oldest well-preserved record of volcanic action in Britain.”

scholarly journals III.—On Accumulation and Denudation, and their Influence in Causing Oscillation of the Earth’s Crust

1883 ◽  
Vol 10 (8) ◽  
pp. 348-356
Author(s):  
Charles Ricketts
Keyword(s):  
Earth’S Crust ◽  
Marine Area ◽  
North West ◽  
The North ◽  
North Wales ◽  
East And West ◽  
Earth's Crust ◽  
Carboniferous Limestone

The Carboniferous Limestone of the north-west of England was formed in a bay separated from another marine area farther south by a narrow isthmus and promontory never submerged, extending, as Professor Jukes pointed out, in “a band of country running east and west across England from Leicestershire, through Warwickshire, South Staffordshire, North Shropshire into Montgomeryshire,” and to the mountainous district of North Wales.

scholarly journals A New Model to Explain the Alignment of Certain Ancient Sites

2020 ◽  
Vol 34 (2) ◽  
pp. 209-232
Author(s):  
Mark Carlotto
Keyword(s):  
Climate Change ◽  
North Pole ◽  
Earth’S Crust ◽  
Upper Egypt ◽  
New Model ◽  
The Past ◽  
The North ◽  
The World ◽  
Global Patterns ◽  
Earth's Crust

In a previous study of over two hundred ancient sites, the alignments of almost half of the sites could not be explained. These sites are distributed throughout the world and include the majority of Mesoamerican pyramids and temples that are misaligned with respect to true north, megalithic structures at several sites in Peru’s Sacred Valley, some pyramids in Lower Egypt, and numerous temples in Upper Egypt. A new model is proposed to account for the alignment of certain unexplained sites based on an application of Charles Hapgood’s hypothesis that global patterns of climate change over the past 100,000 years could be the result of displacements of the Earth’s crust and corresponding shifts of the geographic poles. It is shown that over 80% of the unexplained sites reference four locations within 30° of the North Pole that are correlated with Hapgood’s hypothesized pole locations. The alignments of these sites are consistent with the hypothesis that if they were built in alignment with one of these former poles they would be misaligned to north as they are now as the result of subsequent pole shifts.

scholarly journals THE SAMOTHRACE EARTHQUAKE OF MAY 2014 AND THE DISPLACEMENTS ESTIMATIONS USING PERMANENT GPS STATIONS DATA

2017 ◽  
Vol 50 (3) ◽  
pp. 1545 ◽  
Author(s):  
S. Bitharis ◽  
A. Fotiou ◽  
C. Pikridas ◽  
D. Rossikopoulos ◽  
S. Pavlides ◽  
...  
Keyword(s):  
Strong Earthquake ◽  
Satellite Observations ◽  
Earth’S Crust ◽  
Seismic Events ◽  
Aegean Area ◽  
The North ◽  
North Aegean ◽  
Geometrical Information ◽  
Gps Networks ◽  
Earth's Crust

The contribution of GPS networks in monitoring seismic events is important because they can provide a direct geometrical information on the Earth's crust using satellite observations In this study position displacements of permanent GPS stations are determined due to intense seismic events in the North Aegean area after the strong earthquake on May 24, 2014. The horizontal coseismic displacements for the Samothrace Island were estimated at 9.4 cm and for Lemnos Island at 5.2 cm respectively. A study period of seven days was enough to show that the deformation evolved into two days.

scholarly journals COMPARATIVE ANALYSIS OF GEODYNAMIC PARAMETERS OBTAINED FROM ASTRONOMIC AND GPS OBSERVATIONS IN POLTAVA

2021 ◽  
pp. 11-16
Author(s):  
L. Halyavina ◽  
N. Zalivadnyj
Keyword(s):  
Deep Structure ◽  
Theoretical Explanation ◽  
Earth’S Crust ◽  
Plumb Line ◽  
Gps Data ◽  
The South ◽  
The North ◽  
Earth's Crust ◽  
Gps Station ◽  
Gps Observations

The functioning of the GPS station and regular astrometric observations with a prismatic astrolabe in Poltava provides series of local displacements of the earth's crust and plumb line in time, characterizing the changes in the gravitational field. The analysis of the N-component of the earth's crust movement and the displacement of the meridional projection of the plumb line was carried out on the basis of GPS data and from observations on the astrolabe, respectively, for the period 2002-2020. Comparison of the trends of these series showed that their shifts occur in opposite directions. It is noted that the movement of the point occurs in the northern direction at a speed of +0.3mm/yr, and the displacement of the plumb line - to the south, at a speed of -2.6mas/year. Similarly, an abrupt displacement of the N-component to the north by + 2mm at the turn of 2014 was accompanied by a displacement of the plumb line to the south by approximately -50 mas. These facts can be explained within the framework of the hypothesis of the existence of a deep structure in the vicinity of Poltava, in which a significant change in mass occurs. The spectra of both series show the presence of cyclicities with close periods: about 3.2, 2.8, 1.0, 0.5, and 0.3 yr. It is known that harmonics with those periods are present in many astrometric series. The geodynamic interpretation of the presented facts requires additional confirmation in observations of neighboring GPS stations, as well as a theoretical explanation and justification.

scholarly journals Spectral harmonic analysis and synthesis of Earth’s crust gravity field

2011 ◽  
Vol 16 (1) ◽  
pp. 193-207 ◽  
Author(s):  
Robert Tenzer ◽  
Pavel Novák ◽  
Peter Vajda ◽  
Vladislav Gladkikh ◽  
Hamayun
Keyword(s):  
Harmonic Analysis ◽  
Gravity Field ◽  
Earth’S Crust ◽  
Analysis And Synthesis ◽  
Earth's Crust

scholarly journals THREE-DIMENSIONAL DENSITY MODEL OF THE EARTH’S CRUST OF THE TERRITORY OF THE REPUBLIC OF NIGER

2021 ◽  
pp. 6-21
Author(s):  
V.N. Glaznev ◽  
◽  
M.V. Mints ◽  
I.A. Yakuba ◽  
◽  
...  
Keyword(s):  
Gravity Field ◽  
Three Dimensional ◽  
Earth’S Crust ◽  
Density Model ◽  
Weight Functions ◽  
Rift System ◽  
Data Set ◽  
Anomalous Gravity ◽  
The Republic ◽  
Earth's Crust

The paper considers the results of calculation of the three-dimensional density model of the Earth’s crust for the territory of the Republic of Niger in conditions of incomplete initial geological and geophysical information. A brief description of the geological structure of the research region is given and the task of the study is formulated. The initial data set of density modeling is described, including: the anomalous gravity field, the initial model of the medium, the constraints on the desired solution, and the weight functions of redistribution of field incompatibilities. Inversion of the anomalous gravity field was performed in a three-dimensional formulation for a regular grid with a 25×25 km spacing in the plan and 14 layers of irregular vertical grid. The density model of the crystalline crust obtained by solving the inverse problem was combined with a priori data on the density of the upper mantle layer and the previously constructed layered model of the sedimentary cover of the region. The main features of the density model of the Earth’s crust are considered and its density heterogeneities are compared with the regional geological and tectonic data. The leading role of young structures of the West African rift System and their relationship with density inhomogeneities in the lower and middle crust of the territory of the Republic of Niger was noted.

Sign in / Sign up

Export Citation Format

Share Document