scholarly journals Tectonic evolution of the Nootka fault zone and deformation of the shallow subducted Explorer plate in northern Cascadia as revealed by earthquake distributions and seismic tomography

2021 ◽  
Author(s):  
Jesse Hutchinson ◽  
Honn Kao ◽  
Michael Riedel ◽  
Koichiro Obana ◽  
Kelin Wang ◽  
...  
Keyword(s):  
Fault Zone ◽  
Seismic Tomography ◽  
Tectonic Evolution

Outcrops and well logs as a practicum for calibrating the accuracy of traveltime tomograms

2015 ◽  
Vol 3 (3) ◽  
pp. SY27-SY40 ◽  
Author(s):  
Sherif M. Hanafy ◽  
Ann Mattson ◽  
Ronald L. Bruhn ◽  
Shengdong Liu ◽  
Gerard T. Schuster
Keyword(s):  
High Resolution ◽  
Fault Zone ◽  
Great Basin ◽  
Seismic Tomography ◽  
Seismic Data ◽  
Hanging Wall ◽  
Normal Fault ◽  
Well Logs ◽  
Drill Core ◽  
Sufficient Detail

We have developed two case studies demonstrating the use of high-resolution seismic tomography and reflection imaging in the field of paleoseismology. The first study, of the Washington fault in southern Utah, USA, evaluated the subsurface deposits in the hanging wall of the normal fault. The second study, of the Mercur fault in the eastern Great Basin of Utah, USA, helped to establish borehole locations for sampling subsurface colluvial deposits buried deeper than those previously trenched along the fault zone. We evaluated the seismic data interpretations by comparison with data obtained by trenching and logging deposits across the Washington fault, and by drill-core sampling and video logging of boreholes penetrating imaged deposits along the Mercur fault. The seismic tomograms provided critical information on colluvial wedges and faults but lacked sufficient detail to resolve individual paleoearthquakes.

Deciphering superimposed Ellesmerian and Eurekan deformation, Piper Pass area, northern Ellesmere Island (Nunavut)

2007 ◽  
Vol 44 (10) ◽  
pp. 1439-1452 ◽  
Author(s):  
Karsten Piepjohn ◽  
Werner von Gosen ◽  
Solveig Estrada ◽  
Franz Tessensohn
Keyword(s):  
Fault Zone ◽  
Tectonic Evolution ◽  
Canadian Arctic ◽  
Ellesmere Island ◽  
Thrust Faults ◽  
Fold Belt ◽  
Sverdrup Basin

The tectonic evolution in the Piper Pass area in northern Ellesmere Island (Canadian Arctic) is characterized by the superimposition of two major deformational events: the Paleozoic Ellesmerian Orogeny and the Tertiary Eurekan deformation. It is difficult to separate the structures formed during each deformation in the parts of the Canadian Arctic in which the post-Ellesmerian and pre-Eurekan Sverdrup Basin is not preserved (Hazen Fold Belt, Central Ellesmere Fold Belt). In the vicinity of the Lake Hazen Fault Zone in the Piper Pass area, kilometre-scale kink folds, cleavage planes and SSE-directed thrust faults are unconformably overlain by Permian through Tertiary rocks of the Sverdrup Basin, which clearly indicates that they are related to the Ellesmerian Orogeny. However, the steep faults of the Lake Hazen Fault Zone are characterized by possible lateral movements and by NNW–SSE compression that cut through or affect both the pre-Ellesmerian Franklinian strata, as well as the post-Ellesmerian Sverdrup Basin deposits. These structures can clearly be assigned to post-mid Cretaceous movements of the Eurekan deformation. The Piper Pass area is a key area in which it is possible to recognize and distinguish Ellesmerian from Eurekan structures.

scholarly journals Plio-Quaternary tectonic evolution of the southern margin of the Alboran Basin (Western Mediterranean)

Solid Earth ◽  
2020 ◽  
Vol 11 (2) ◽  
pp. 741-765 ◽  
Author(s):  
Manfred Lafosse ◽  
Elia d'Acremont ◽  
Alain Rabaute ◽  
Ferran Estrada ◽  
Martin Jollivet-Castelot ◽  
...  
Keyword(s):  
Fault Zone ◽  
Tectonic Evolution ◽  
Long Term Evolution ◽  
Western Mediterranean ◽  
Strike Slip ◽  
Term Evolution ◽  
Southern Margin ◽  
Constant Direction ◽  
Alboran Basin

Abstract. Progress in the understanding and dating of the sedimentary record of the Alboran Basin allows us to propose a model of its tectonic evolution since the Pliocene. After a period of extension, the Alboran Basin underwent a progressive tectonic inversion starting around 9–7.5 Ma. The Alboran Ridge is a NE–SW transpressive structure accommodating the shortening in the basin. We mapped its southwestern termination, a Pliocene rhombic structure exhibiting series of folds and thrusts. The active Al-Idrissi Fault zone (AIF) is a Pleistocene strike-slip structure trending NNE–SSW. The AIF crosses the Alboran Ridge and connects to the transtensive Nekor Basin and the Nekor Fault to the south. In the Moroccan shelf and at the edge of a submerged volcano we dated the inception of the local subsidence at 1.81–1.12 Ma. The subsidence marks the propagation of the AIF toward the Nekor Basin. Pliocene thrusts and folds and Quaternary transtension appear at first sight to act at different tectonic periods but reflect the long-term evolution of a transpressive system. Despite the constant direction of Africa–Eurasia convergence since 6 Ma, along the southern margin of the Alboran Basin, the Pliocene–Quaternary compression evolves from transpressive to transtensive along the AIF and the Nekor Basin. This system reflects the logical evolution of the deformation of the Alboran Basin under the indentation of the African lithosphere.

scholarly journals Fault zone properties affecting the rupture evolution of the 2009 (Mw6.1) L'Aquila earthquake (central Italy): Insights from seismic tomography

2011 ◽  
Vol 38 (10) ◽  
pp. n/a-n/a ◽  
Author(s):  
R. Di Stefano ◽  
C. Chiarabba ◽  
L. Chiaraluce ◽  
M. Cocco ◽  
P. De Gori ◽  
...  
Keyword(s):  
Fault Zone ◽  
Seismic Tomography ◽  
Central Italy ◽  
L’Aquila Earthquake
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