Results 251 to 260 of about 724,346 (300)

SEISMIC ANISOTROPY BENEATH THE CONTINENTS: Probing the Depths of Geology

, 1996
Seismic anisotropy beneath continents is analyzed from shear-wave splitting recorded at more than 300 continental seismic stations. Anisotropy is found to be a ubiquitous property that is due to mantle deformation from past and present orogenic activity.
P. Silver
semanticscholar   +1 more source

Earthquake calamity warning from space station: orbital dynamics coupling geology mantle convection

SPIE Proceedings, 2009
It is not surprising that the earthquakes happened among clashing tectonic plate boundaries where numerous earthquake stations exist. Then, why do we need more? The significance of Sichuan and Tongshan earthquakes of China is a wakeup call that major earthquakes of logarithmic Richter scales beyond 7 could happen exactly within a single tectonic ...
Han-Shou Liu, Harold H. Szu
openaire   +2 more sources

Evaluation of ground-penetrating radar (GPR) and geology survey for slope stability study in mantled karst region

Environmental Earth Sciences, 2018
Engineering geological problems such as slope failure may be a result of the karst process. Slope stability evaluation is an effective way to minimize the losses caused by slope failure. In this study, a methodology is developed to evaluate the slope stability.
Peng Xie, Peng Xiao, Zhang Yanyan, Haijia Wen   +3 more
openaire   +2 more sources

Thermometers and Barometers for Volcanic Systems

, 2008
Knowledge of temperature and pressure, however qualitative, has been central to our views of geology since at least the early 19th century. In 1822, for example, Charles Daubeny presented what may be the very first “Geological Thermometer,” comparing ...
K. Putirka
semanticscholar   +1 more source

Seismic anisotropy in the boundary layers of the mantle

, 2013
This chapter discusses seismic anisotropy in the mantle, highlighting mechanisms, observations and interpretations. Although evidence of anisotropy in the Earth is now commonplace, it can be difficult to uniquely identify its underlying cause.
J-M Kendall
semanticscholar   +1 more source

SEISMIC REFRACTION ANALYSIS OF WATERSHED MANTLE RELATED TO SOIL, GEOLOGY AND HYDROLOGY¹

JAWRA Journal of the American Water Resources Association, 1974
ABSTRACT: An extensive hammer seismic refraction survey was carried out in three contiguous watersheds (217, 89, and 190 acres) on a laccolith near Sturgis, South Dakota to test its utility in rugged mountain terrain. Isopachs (lines connecting points of equal mantle thickness), area‐elevation curves (hypsometry), and structure contours were used ...
openaire   +2 more sources

The Geology and Tectonic Settings of China’s Mineral Deposits.

, 2013
Franco Pirajno. Pp. 679. 2013. Springer. ISBN 978-94-007-4443-1. Price: €129.95. This is Pirajno’s fourth book, the first three being Hydrothermal Mineral Deposits – Principles and Fundamental Concepts for the Exploration Geologist (1992), Ore Deposits ...
G. Collins
semanticscholar   +1 more source

Actual traces of mantle fluid from alkalic-rich porphyry and deep xenoliths in Liuhe, Yunnan, and its implication to geology

2011 International Conference on Remote Sensing, Environment and Transportation Engineering, 2011
There are quite a few mantle xenoliths and one special Fe-rich melt xenolith in aegirine syenite porphyry, Liuhe, Yunnan province. Petrographic research shows that black opaque material that is Fe-rich glass, which are widely distribute reticulate along intergranular cracks of minerals, crystals fissues and cleavage in association with metasomatic ...
Yating Chu, Xian-fan Liu
openaire   +2 more sources

The Geology and Geochemistry of the Wadagera Kimberlite and the Characteristics of the Underlying Subcontinental Lithospheric Mantle, Dharwar Craton, India

2013
The Wadagera kimberlite is situated near the northern bank of the Krishna River in northern Karnataka. It is the largest pipe in a cluster discovered by De Beers during exploration in 2002. The pipe has been dated at 1,083.8 ± 5.3 Ma, which corresponds to published ages of kimberlites in the adjacent Narayanpet cluster.
Robin Preston, Sojen Joy, Michael Lynn
openaire   +2 more sources

45 m.y. of Aegean crust and mantle flow driven by trench retreat

, 2010
The available seismic anisotropy data in the Aegean shallow mantle and their relationship with crustal deformation are used for deciphering the lithosphere-scale flow pattern driven by rollback of the Hellenic subduction slab.
J. Brun, D. Sokoutis
semanticscholar   +1 more source