The Proterozoic Fort Simpson structural trend in northwestern Canada

abstract A detailed macroseismic study of the July 11, 1927 earthquake was carried out. A quantitative analysis of damage data provided a correlation for estimating (MM) intensities: I = 6.4 + 1.2 log (percentage of damaged houses). Using axis lengths and areas bounded by the ensuing isoseismal lines, the depth (16 to 28 km) of the event was estimated, and its probable epicenter located near Damiya bridge on the Jordan river. A comparison with the equivalent parameters, inferred from instrumental records, shows agreement between both sets of results and thus confirms the validity of the approach used in the macroseismic study. The same procedure of studying macroseismic data was applied to an earlier (January 1, 1837) destructive earthquake. It was found that this latter event orginated in the upper crust, eastward of Safed, with a 6.25 to 6.5 magnitude. The isoseismals of both these major earthquakes are elongated in a north-south direction, along the major structural trend in the area. The southern coastal plain of Israel seems generally less vulnerable to Jordan Rift Valley earthquakes than inland regions of similar epicentral distances, though local pockets of anomalous intensities are observed for both earthquakes.

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Aromatic Thiolate-Protected Series of Gold Nanomolecules and a Contrary Structural Trend in Size Evolution

Accounts of Chemical Research ◽

10.1021/acs.accounts.8b00150 ◽

2018 ◽

Vol 51 (8) ◽

pp. 1774-1783 ◽

Cited By ~ 74

Author(s):

Naga Arjun Sakthivel ◽

Amala Dass

Keyword(s):

Structural Trend ◽

Size Evolution

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Tectono-sedimentary evolution of a fore-chain domain : example of the Habt and Sidi Mrayt basins, northwestern external Moroccan Rif ; stratigraphic precisions and tectonic modelling

BSGF - Earth Sciences Bulletin ◽

10.2113/175.4.383 ◽

2004 ◽

Vol 175 (4) ◽

pp. 383-397 ◽

Cited By ~ 8

Author(s):

Abdelali Zakir ◽

Ahmed Chalouan ◽

Hugues Feinberg

Keyword(s):

Upper Cretaceous ◽

Middle Miocene ◽

Middle Eocene ◽

Fault Propagation ◽

Lower Eocene ◽

Structural Trend ◽

Sedimentary Evolution ◽

Structural Relationships ◽

Regional Tectonic ◽

Ridge Structures

Abstract In this paper, a tecto-sedimentary evolution model of the northwestern external Rif zones (Morocco) is proposed. It is based on the study of structural relationships and the biostratigraphic and sedimentologic analysis of different Tertiary syn-tectonic units. This zone shows alternating foredeep basins and anticlinal ramps with a NNW-SSE structural trend and a vergence toward the WSW. The trend of turbiditic bodies and palaeocurrent directions (from the SSE to the NNW) are parallel to the regional tectonic strike. Sidi Mrayt and El Habt basins are filled with syn-tectonic middle Eocene to middle Miocene sediments; The Habt basin is subdivided in two sub-basins: Asilah-Larache and Rirha-Gzoula. The deposits are distributed in two separated turbiditic complex, each one including a stacking of turbiditic systems. The Rirha-Gzoula and Asilah-Larache sub-basins are located in front of two anticline ridge structures made up of Upper Cretaceous and Lower Eocene material; they are respectively Boujediane and Arbaa Ayacha anticlines. The distribution of turbiditic bodies, unconformities and structural relationships within the thrusts and folds system in the northwestern external Rif indicate the progression toward the external zones of fault-propagation folds and associated basins.

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Contribution a l'etude geologique du bassin hydromineral de Vals (Ardeche)

BSGF - Earth Sciences Bulletin ◽

10.2113/gssgfbull.s6-vii.7.893 ◽

1957 ◽

Vol S6-VII (7) ◽

pp. 893-927

Author(s):

Jean Paul Destombes

Keyword(s):

Crystalline Basement ◽

Mineral Springs ◽

Structural Trend ◽

Quartz Veins ◽

One Stage

Abstract The occurrence of mineral springs in the Vals region, France, is not related directly to Tertiary faults. The springs are all located in a mylonitic zone of the crystalline basement, cut by fissured ancient quartz veins which form the channels for the waters. Successive stages of reopening of these veins can be recognized, corresponding to different orogenic phases. One stage is related to recent basalt intrusions which follow an older northwestward structural trend.

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