Permeability changes in simulated granite faults during and after frictional sliding

Thermal–hydrological–mechanical coupling processes suggest that fault permeability should undergo dynamic change as a result of seismic slip. In igneous rocks, a fault's slip surface may have much higher permeability than the surrounding rock matrix and therefore operate as a conduit for fluids. We conducted laboratory experiments to investigate changes in fracture permeability (or transmissivity) of a fault in granite due to shear slip and cyclic heating and cooling. Our experiments showed that high initial fracture transmissivity (>10^?18 m³) was associated with a high friction coefficient and that transmissivity decreased during slip. We propose that this reduction in transmissivity reflects the presence of gouge in fracture voids, increasing the area of contact in the fault plane and reducing the hydraulic aperture. In contrast, when initial fracture transmissivity was low (<10^?18 m³), we observed that friction was lower and transmissivity increased during slip. The high transmissivity and high friction may be explained by large areas of bare rock being in contact on the slip surface. Slip velocity had little influence on the evolution of permeability, probably because gouge produced at different slip velocities had similar grain size distributions, or because gouge leaked from the slip surface. Transmissivity decreased with increasing temperature in heating tests, probably due to thermal expansion increasing normal stress on the fracture. Frictional heating did not influence transmissivity during the shearing tests.     

Architectural Discourse and Social Transformation During the Early Neolithic of Southeast Anatolia

Within the Near Eastern research canon, the transition to more sedentary lifestyles during the Neolithic is often framed as an economic necessity, linked to plant and animal domestication, climatic change and population stress. In such a framework, an increasingly complex social structure, arising in response to the increasingly complex relations of agricultural production, is presumed. For example, some researchers would argue that feasting-based rituals became an arena of social control and an increasingly complex society began to emerge around ritual leadership and monumental ritual architecture. Yet the research projects conducted at many Near Eastern sites indicate neither that sedentism can be directly linked to the requirements of agriculture, nor that the presence of monumental architecture can be successfully associated with social control based on unequal redistribution of agricultural surplus. While ritual activity appears to be central during the Neolithic, two important questions remain to be explored: (1) what exactly did the rituals control, given that the societies under consideration are commonly perceived to have an ‘egalitarian’ ethos?; and (2) what happened to the ritual control in the second half of the PPNB, when ritual architecture completely disappears from the archaeological record at a time of increased reliance on agriculture? Through a critical review of the use of terms like ‘sedentism’, ‘egalitarianism’ and ‘ritual’, I argue that the architecture of the Early Neolithic is related to the management of social relationships through symbolic place-making activities. Based on a comparative review of burial activity, building continuity and the use of symbolic imagery, I examine the symbolic construction of some of the earliest examples of long-term occupational focus in southeast Anatolia, such as Hallan Çemi, Demirköy, Körtik Tepe, Hasankeyf Höyük, Gusir Höyük, Göbekli Tepe, Çayönü and Neval? Çori, in an attempt to understand the social factors behind the emergence and demise of Early Neolithic monumental architecture. The evidence from the above-mentioned sites suggests that Early Neolithic place-making reflects community formation at a variety of scales, at the center of which lay the continuous reinvention of kinship concepts. While some sites, with concentrations of burials, may have become the locus for construction of more intimate local place-based networks, other sites, such as Göbekli Tepe, may have integrated the extended networks. Arguably, the formation of large scale networks during the PPNA posed a threat to local groups. Thus, a focus on local group formation and close control of social exchanges may have begun during the early PPNB, and the places such as Göbekli Tepe may have fallen out of use during this process. In the context of the symbolism and figurine evidence, I further argue that sex and gender may have become important issues, both in the formation of place-communities during the late PPNA—early PPNB, and in the emergence of autonomous households during the later PPNB.     

The Role of Government Policies and Strategies Behind the Shrinking Urban Core in an Expanding City Region: The Case of Izmir

Over the last few decades, the term urban shrinkage has come to be accepted as a valid concept in international academic circles, and has gradually gained importance, with its causes the subject of well-documented discussion. While previous discussions of urban shrinkage have directed attention to cities shrinking as a whole, recent research started to recognize the case of shrinkage in growing cities and regions. As such, recent discussions of urban shrinkage indicate that patterns of shrinkage vary considerably from city to city, and from sub-region to sub-region, with the importance of local dynamics in responding to changing economic pressures given much consideration. Recent studies have tended to disregard the role of government policies and strategies put in place to facilitate the adaptation of the urban economies to the new conditions. Taking Izmir as an example, being a fast-growing metropolitan region in Turkey, this paper presents evidence of government policies and strategies aimed at enhancing the development of peripheral areas that have led to shrinkage of the metropolitan core. This paper focuses on this experience and discusses its implications.     

Behavioral Ecology and Archaeology

Behavioral ecology is the study of adaptive behavior in relation to social and environmental circumstances. Analysts working from this perspective hold that the reproductive strategies and decision-making capacities of all living organisms—including humans—are shaped by natural selection. Archaeologists have been using this proposition in the study of past human behavior for more than 30 years. Significant insights on variation in prehistoric human subsistence, life history, social organization, and their respective fossil and archaeological consequences have been among the more important results.     

Determining suitable investment areas using multi‐variable statistical methods: evidence from the Black Sea region in Turkey

Investment is an important decision for economic development, balanced growth and public welfare. There are many factors influencing investment. Thus, investment must be evaluated with multidimensional methods. Using taxonomy and principal component analysis this study attempts to determine appropriate investment areas in planned provinces in the Black Sea Region. Analyses were based on a number of demographic, economic, health, education, employment and cultural indicators. Results indicated that provinces were grouped into four clusters. Gümü?hane and Bayburt were determined to have the highest priority for investment in the manufacturing industry.