Results 151 to 160 of about 12,697 (195)

Evolution of volcanism in graben and horst structures along the Cenozoic Cameroon Line (Africa): implications for tectonic evolution and mantle source composition

Mineralogy and Petrology, 2008
Tombel graben and Mounts Bambouto are two volcanic fields of the typical system of alternating graben and horst structure of the Cameroon Volcanic Line. Tombel graben is a young volcanic field, whereas Mounts Bambouto horst is an old stratovolcano with calderas.
G. Nkouathio, D., Kagou Dongmo, A., Bardintzeff, J.M, Wandji, P., Bellon, H., Pouclet, André   +5 more
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Spectral Ratio Estimates for Site Effects on the Horst–Graben System in West Turkey

Pure and Applied Geophysics, 2013
Recordings of micro- and moderate-size local earthquakes have been used to quantify site effects in the central-west Turkey which contains one of the world’s best examples of a rapid intra-continental extension with its high population and industrial potential.
Kurtulmuş, Tevfik Özgür, Akyol, Nihal, Camyildiz, Murat, Güngör, Talip   +3 more
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JABIRU FIELD — HORST, SUB- HORST OR INVERTED GRABEN?

The APEA Journal, 1989
With control from only the Jabiru 1A discovery well and a grid of seismic lines 3 km apart, original oil- in- place at Jabiru was estimated by the operator as 620 MMBBL (100 MkL). With a 3- D seismic grid and three more wells, the original oil- in- place estimate was reduced to 45 MMBBL (7 MkL).
openaire   +1 more source

The Nature and Origin of the Horst and Graben Structure of Southern Oregon

The Journal of Geology, 1929
In southern Oregon east of the Cascade Mountains a varied series of Tertiary lavas is cut by the northern continuation of the Basin Range faults, giving rise principally to relatively undissected horst and graben structure rather than to tilted fault-block mountains. The tensional origin of these faults is indicated by definite normal faulting, curving,
Richard E. Fuller, Aaron Clement Waters
openaire   +1 more source

Icelandic Tectonics—Graben or Horst ?

Geological Magazine, 1941
The younger rocks of Iceland (Pliocene to Present Day) occupy the broad median zone shown in Text-fig. I; the boundaries are only approximate in places, and information is lacking with regard to the eastern one particularly. Outside this zone early Tertiary basalts predominate but (I) the uppermost basalts are regarded by some authors as Quaternary, (2)
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Implications of horsts and grabens on the development of canyons and seismicity on the west africa coast

Journal of African Earth Sciences, 2018
Abstract Subsurface basement topography in the Nigerian portion of the Benin Basin has been studied using borehole data of wells drilled to the basement and one strike line of seismic section. Two areas of a sharp drop in topography with a horst in between were observed in the study area.
Peter S. Ola, Solomon O. Olabode
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Geothermal anomalies in the Valles‐Penedes Graben Master Fault: Convection through the Horst as a possible mechanism

Journal of Geophysical Research: Solid Earth, 1990
Four different mechanisms (frictional heating, magmatic intrusion, free convection, and forced convection) have been tested as possible causes to explain the localized and relatively high geothermal anomalies found along master faults of graben structures. Forced convection is the only mechanism found to be generally able to generate the anomalies. The
M. Fernàndez, E. Banda
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Redefining Horst and Graben Distribution in The Onshore Part of The North East Java Basin and Its New Exploration Opportunity

Proceedings of Indonesian Petroleum Association, 46th Annual Convention & Exhibition, 2022, 2022
The onshore part of North East Java Basin (NEJB) is a well-known hydrocarbon producing area in Indonesia, with the largest proven reservoir being the Oligo - Miocene carbonates which accumulated over basement horsts. Currently, the understanding of horst distribution is based on previous publications. However, new integration studies on surface data (e.
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A Method of Graben and Horst Formation

The Journal of Geology, 1958
Grabens and horsts between transcurrent faults in New Zealand, currently explained by normal faulting, are shown to be caused by lateral displacement. The mechanics of the formation of such features is explained.
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Horst and graben structures on the flanks of the Mid-Atlantic ridge in the MARK area (23°22′N): Submersible observations

Tectonophysics, 1996
Abstract South of the Kane fracture zone (23°40′N), the Mid-Atlantic ridge is segmented into 20–100-km-long spreading cells in which morphology, seismic and gravity signatures change along and across the ridge-axis. The rift valley, considered as a typical structure along slow-spreading ridges, can be symmetric or asymmetric, and segment centers ...
C. Durant, V. Ballu, P. Gente, J. Dubois
openaire   +1 more source