The temporal evolution of syn-sedimentary normal faults and the possible role of tip retreat

2020 ◽  
Author(s):  
Bailey Lathrop ◽  
Christopher Jackson ◽  
Rebecca Bell ◽  
Atle Rotevatn
Keyword(s):  
Growth Model ◽  
Temporal Evolution ◽  
Fault Model ◽  
Normal Faults ◽  
Constant Length ◽  
Final Length ◽  
Fault Growth ◽  
Stratigraphic Evolution ◽  
The Relationship

<p>We need to understand how normal faults grow in order to better determine the tectono-stratigraphic evolution of rifts, and the distribution and size of potentially hazardous earthquakes. The growth of normal faults is commonly described by two models: 1) the propagating fault model (isolated growth model), and 2) the constant-length model. The propagating fault model envisages a sympathetic increase between fault lengthening (L) and displacement (D), whereas the constant-length model states that faults reach their near-final length before accumulating significant displacement (Walsh et al., 2002). Several relatively recent studies agree that faults generally follow a constant-length model, or a “hybrid model” of the two, where most faults reach their near final length within the first 20-30% of their lives, and accrue displacement throughout. Furthermore, in the past 20 years, much research has focused on how faults grow; relatively few studies have questioned what happens to the fault geometry as it becomes inactive, i.e. do faults abruptly die, or do they more gradually become inactive by so-called tip retreat. We here use a 3D seismic reflection dataset from the Exmouth Plateau, offshore Australia to support a hybrid fault growth model for normal faults, and to also determine the relationship between length and displacement as a fault dies. We show that the studied faults grew in three distinct stages: a lengthening stage (<30% of the faults life), a displacement accrual stage (30-75%), and a possible tip retreat stage (75%-end). This work has important implications in our understanding of the temporal evolution of normal faults, both how they grow and how they die.</p>

scholarly journals The Temporal Evolution of Proactiveness in Family Firms

2013 ◽  
Vol 27 (1) ◽  
pp. 35-50 ◽  
Author(s):  
Alfredo De Massis ◽  
Francesco Chirico ◽  
Josip Kotlar ◽  
Lucia Naldi
Keyword(s):  
Family Firms ◽  
Temporal Evolution ◽  
Family Members ◽  
Firm Age ◽  
Managerial Control ◽  
Contingency Perspective ◽  
The Family ◽  
The Relationship ◽  
Moderating Role

We extend prior work on proactiveness in family firms by examining the relationship between firm age and proactiveness. Specifically, we propose an S-shaped effect of aging of family firms on proactiveness. Additionally, we provide a contingency perspective by considering the moderating role of the dispersion of managerial control among family members. Using a sample of Swiss family firms, we find that proactiveness first declines, then increases, and finally decreases again as the family firm ages, and that this relationship is steeper when the managerial control is dispersed among multiple family members.

A new theory of innovation and growth: the role of banking intermediation and corruption

2016 ◽  
Vol 33 (4) ◽  
pp. 488-500 ◽  
Author(s):  
João Tovar Jalles
Keyword(s):  
Endogenous Growth ◽  
Growth Model ◽  
Financial Sector ◽  
Equilibrium Analysis ◽  
Model Specification ◽  
Content Type ◽  
Financial Sector Development ◽  
Endogenous Growth Model ◽  
The Relationship

Purpose There has been an increased interest in the role of the financial sector and institutional quality in the development process. Design/methodology/approach This paper addresses the relationship between corruption and financial sector development by constructing a Schumpeterian endogenous growth model, allowing for the entry of competitive firms with an explicit role for politics and banking. Findings Assuming that technologically advanced firms are located in developed countries and backward firms in developing countries, the model in this study suggests that low corruption are more growth enhancing in the former group of countries. Better institutions stimulate entry by reducing banking screening costs and entry is more growth enhancing in sectors closer to the technological frontier. Research limitations/implications The model in this study is a partial equilibrium analysis and one should include a role for labour markets to address the household’s problem and enrich the model’s conclusions. Secondly, the model specification rests on the fact that the degree of corruption is correlated with the level of institutions. Even though this might be subject to some criticism, this is a common practice across the literature and so, it is clearly a matter of taste. Practical implications The main policy conclusion is that anti-corruption policy initiatives should prioritize corruption that distorts incentives with respect to productive investment that directly and negatively affects growth. Originality/value This paper addresses the relationship between corruption and financial sector development by constructing a Schumpeterian endogenous growth model, allowing for the entry of competitive firms with an explicit role for politics and banking.

scholarly journals The Role of Autumn Infections in the Progression of Fire Blight Symptoms in Perennial Pear Branches

Plant Disease ◽  
2003 ◽  
Vol 87 (9) ◽  
pp. 1077-1082 ◽  
Author(s):  
D. Blachinsky ◽  
D. Shtienberg ◽  
D. Oppenheim ◽  
M. Zilberstaine ◽  
S. Levi ◽  
...  
Keyword(s):  
Fire Blight ◽  
Shoot Growth ◽  
Erwinia Amylovora ◽  
Symptom Expression ◽  
Host Phenology ◽  
Final Length ◽  
Symptom Progression ◽  
In Fire ◽  
The Relationship

The role of autumn infections in the progression of fire blight (caused by Erwinia amylovora) symptoms in perennial pear branches was studied in orchard-grown trees in Israel. The extent of symptom progression and the final length of fire blight cankers in perennial branches were variably affected by the vigor of the trees and the season of infection. Following spring infections, when all trees supported active shoot growth, fire blight symptoms progressed more rapidly and to longer distances in trees that exhibited high vigor (i.e., with numerous annual shoots on most terminal branches) than in low-vigor trees (i.e., few or no annual shoots on terminal branches). Irrespective of the vigor of the trees, the progression of fire blight symptoms in perennial branches ceased between mid-May and mid-July, and only a small proportion (0 to 14.2%) of the infections had invaded main limbs or trunks of trees. Progression of fire blight symptoms following autumn infections was related to the preceding summer (August to No-vember) shoot regrowth: in trees in which the shoots did not restore their growth in the summer, the rate of symptom progression in perennial branches was higher in trees with a low vigor than in those with a high vigor, whereas for those with summer regrowth the relationship between rates of symptom expression was reversed. Irrespective of the vigor group and of whether there was summer regrowth, symptoms in perennial branches continued to progress through the winter until the following spring. Most of the autumn infections (50 to 78.5%) that developed in susceptible trees had invaded main limbs or trunks of trees. The results of this study indicate that factors related to host phenology and physiology, rather than factors related to environmental influences (such as temperature), govern the extent, rate, and duration of fire blight progression in perennial pear branches. Furthermore, it turned out that autumn infections play a substantial role in fire blight epidemiology in Israel.

scholarly journals Geometric and temporal evolution of extensional growth folds in the Barents Sea, offshore Norway: A tool to understand normal fault growth

2021 ◽  
Author(s):  
Ahmed Alghuraybi ◽  
Rebecca Bell ◽  
Chris Jackson
Keyword(s):  
Surface Deformation ◽  
Barents Sea ◽  
Temporal Evolution ◽  
Normal Fault ◽  
Normal Faults ◽  
Borehole Data ◽  
Growth Strata ◽  
Sedimentary Evolution ◽  
Extensional Strain ◽  
Fault Growth

Extensional growth folds form ahead of the tips of propagating normal faults. These folds can accommodate a considerable amount of extensional strain and they may control rift geometry. Fold-related surface deformation may also control the sedimentary evolution of syn-rift depositional systems; thus, the stratigraphic record can constrain the four-dimensional evolution of extensional growth folds, which in term provides a record of fault growth and broader rift history. Here we use high-quality 3D seismic reflection and borehole data from the SW Barents Sea, offshore northern Norway to determine the geometric and temporal evolution of extensional growth folds associated with a large, long-lived, basement-involved fault. We show that the fault grew via linkage of four segments, and that fault growth was associated with the formation of fault-parallel and fault-perpendicular folds that accommodated a substantial portion (10 – 40%) of the total extensional strain. Fault-propagation folds formed at multiple times in response to periodic burial of the causal fault, with individual folding events (c. 25 Myr and 32 Myr) lasting a considered part of the total, c. 130 Myr rift period. Our study supports previous suggestions that continuous (i.e., folding) as well as discontinuous (i.e., faulting) deformation must be explicitly considered when assessing total strain in extensional setting. We also show changes in the architecture of growth strata record alternating periods of how folding and faulting, showing how rift margins may be characterised by basinward-dipping monoclines as opposed to fault-bound scarps. Our findings have broader implications for our understanding of the structural, physiographic, and tectonostratigraphic evolution of rift basins.

scholarly journals A new model for the growth of normal faults developed above pre-existing structures

Geology ◽  
2021 ◽  
Author(s):  
Emma K. Bramham ◽  
Tim J. Wright ◽  
Douglas A. Paton ◽  
David M. Hodgson
Keyword(s):  
Early Period ◽  
Normal Fault ◽  
Sedimentary Basins ◽  
Vertical Displacement ◽  
Wide Distribution ◽  
Airborne Lidar ◽  
Normal Faults ◽  
Constant Length ◽  
Existing Structures ◽  
Fault Growth

Constraining the mechanisms of normal fault growth is essential for understanding extensional tectonics. Fault growth kinematics remain debated, mainly because the very earliest phase of deformation through recent syn-kinematic deposits is rarely documented. To understand how underlying structures influence surface faulting, we examined fault growth in a 10 ka magmatically resurfaced region of the Krafla fissure swarm, Iceland. We used a high-resolution (0.5 m) digital elevation model derived from airborne lidar to measure 775 fault profiles with lengths ranging from 0.015 to 2 km. For each fault, we measured the ratio of maximum vertical displacement to length (Dmax/L) and any nondisplaced portions of the fault. We observe that many shorter faults (<200 m) retain fissure-like features, with no vertical displacement for substantial parts of their displacement profiles. Typically, longer faults (>200 m) are vertically displaced along most of their surface length and have Dmax/L at the upper end of the global population for comparable lengths. We hypothesize that faults initiate at the surface as fissure-like fractures in resurfaced material as a result of flexural stresses caused by displacements on underlying faults. Faults then accrue vertical displacement following a constant-length model, and grow by dip and strike linkage or lengthening when they reach a bell-shaped displacement-length profile. This hybrid growth mechanism is repeated with deposition of each subsequent syn-kinematic layer, resulting in a remarkably wide distribution of Dmax/L. Our results capture a specific early period in the fault slip-deposition cycle in a volcanic setting that may be applicable to fault growth in sedimentary basins.

Choosing a Markov blanket

2020 ◽  
Vol 43 ◽  
Author(s):  
Thomas Parr
Keyword(s):  
Markov Blanket ◽  
Target Article ◽  
The Relationship

Abstract This commentary focuses upon the relationship between two themes in the target article: the ways in which a Markov blanket may be defined and the role of precision and salience in mediating the interactions between what is internal and external to a system. These each rest upon the different perspectives we might take while “choosing” a Markov blanket.

Staring Down Death

Crisis ◽  
2016 ◽  
Vol 37 (3) ◽  
pp. 212-217 ◽  
Author(s):  
Thomas E. Joiner ◽  
Melanie A. Hom ◽  
Megan L. Rogers ◽  
Carol Chu ◽  
Ian H. Stanley ◽  
...  
Keyword(s):  
Suicide Risk ◽  
Clinical Utility ◽  
Blink Rate ◽  
Specific Task ◽  
Careful Planning ◽  
Eye Blink ◽  
Eye Blinks ◽  
Potential Clinical Utility ◽  
The Relationship

Abstract. Background: Lowered eye blink rate may be a clinically useful indicator of acute, imminent, and severe suicide risk. Diminished eye blink rates are often seen among individuals engaged in heightened concentration on a specific task that requires careful planning and attention. Indeed, overcoming one’s biological instinct for survival through suicide necessitates premeditation and concentration; thus, a diminished eye blink rate may signal imminent suicidality. Aims: This article aims to spur research and clinical inquiry into the role of eye blinks as an indicator of acute suicide risk. Method: Literature relevant to the potential connection between eye blink rate and suicidality was reviewed and synthesized. Results: Anecdotal, cognitive, neurological, and conceptual support for the relationship between decreased blink rate and suicide risk is outlined. Conclusion: Given that eye blinks are a highly observable behavior, the potential clinical utility of using eye blink rate as a marker of suicide risk is immense. Research is warranted to explore the association between eye blink rate and acute suicide risk.

Parenting Behaviors and Anxiety in Young Adults

2015 ◽  
Vol 36 (3) ◽  
pp. 170-176 ◽  
Author(s):  
Erin N. Stevens ◽  
Joseph R. Bardeen ◽  
Kyle W. Murdock
Keyword(s):  
Effortful Control ◽  
Parenting Behaviors ◽  
Protective Role ◽  
Anxiety Symptoms ◽  
Interactive Effects ◽  
Parental Overprotection ◽  
High Control ◽  
Development Of Anxiety ◽  
The Relationship

Parenting behaviors – specifically behaviors characterized by high control, intrusiveness, rejection, and overprotection – and effortful control have each been implicated in the development of anxiety pathology. However, little research has examined the protective role of effortful control in the relation between parenting and anxiety symptoms, specifically among adults. Thus, we sought to explore the unique and interactive effects of parenting and effortful control on anxiety among adults (N = 162). Results suggest that effortful control uniquely contributes to anxiety symptoms above and beyond that of any parenting behavior. Furthermore, effortful control acted as a moderator of the relationship between parental overprotection and anxiety, such that overprotection is associated with anxiety only in individuals with lower levels of effortful control. Implications for potential prevention and intervention efforts which specifically target effortful control are discussed. These findings underscore the importance of considering individual differences in self-regulatory abilities when examining associations between putative early-life risk factors, such as parenting, and anxiety symptoms.

Social Support, Emotional Intelligence, and Posttraumatic Stress Disorder Symptoms

2016 ◽  
Vol 37 (1) ◽  
pp. 31-39 ◽  
Author(s):  
Nicole L. Hofman ◽  
Austin M. Hahn ◽  
Christine K. Tirabassi ◽  
Raluca M. Gaher
Keyword(s):  
Social Support ◽  
Posttraumatic Stress Disorder ◽  
Emotional Intelligence ◽  
Protective Factors ◽  
Posttraumatic Stress ◽  
Stress Disorder ◽  
Traumatic Events ◽  
Ptsd Symptoms ◽  
The Relationship

Abstract. Exposure to traumatic events and the associated risk of developing Posttraumatic stress disorder (PTSD) symptoms is a significant and overlooked concern in the college population. It is important for current research to identify potential protective factors associated with the development and maintenance of PTSD symptoms unique to this population. Emotional intelligence and perceived social support are two identified protective factors that influence the association between exposure to traumatic events and PTSD symptomology. The current study examined the mediating role of social support in the relationship between emotional intelligence and PTSD symptoms. Participants included 443 trauma-exposed university students who completed online questionnaires. The results of this study indicated that social support mediates the relationship between emotional intelligence and reported PTSD symptoms. Thus, emotional intelligence is significantly associated with PTSD symptoms and social support may play an integral role in the relationship between emotional intelligence and PTSD. The current study is the first to investigate the role of social support in the relationship between emotional intelligence and PTSD symptoms. These findings have important treatment and prevention implications with regard to PTSD.

Sign in / Sign up

Export Citation Format

Share Document