Open Access Short Research Article

Structural Control of the São Francisco River Delta from the Aeromagnetic Data, Brazil

Alana Aderne dos Santos, Alanna Costa Dutra, José M. Landim Dominguez

Journal of Geography, Environment and Earth Science International, Page 1-12
DOI: 10.9734/jgeesi/2019/v22i230143

The São Francisco River delta is a Quaternary sandy plain built on a structural low of the Sergipe-Alagoas Basin, known as the São Francisco Low. The inner limit of the São Francisco River delta is defined by rectilinear cliffs between the delta plain and the Barreiras Formation, which coincide with important faults delimiting the São Francisco Low. Moreover, on the continental shelf, the deltaic clinoform developed over a topographic low limited by rectilinear scarps that present compatible orientation with the Sergipe-Alagoas structural framework. Thus, based on a theoretical background that indicates the existence of structural control over the formation of delta systems in general, and previous knowledge of this area, it is possible that the Sergipe-Alagoas Basin structure has influenced the delta. This relationship can be inferred using adequate methodology. Magnetometric data was integrated in the present study with the geological information on the area. The main objective was to evaluate the existing structural controls over the formation of the São Francisco delta and neighboring areas. The first stage of the present study consisted of a thorough bibliographic review and the search for pre-existing geophysical data in the region.

Open Access Original Research Article

Landslide Susceptibility Analysis Using Frequency Ratio Model in a Tropical Region, South East Asia

P. Vineetha, S. Sarun, A. M. Sheela

Journal of Geography, Environment and Earth Science International, Page 1-13
DOI: 10.9734/jgeesi/2019/v22i230140

Landslides are very frequent and disastrous phenomena in the Western Ghats regions of South East Asia during the monsoon season and it occurrence is triggered by many factors. Hence, it is essential to develop a landslide hazard assessment map to find out the areas at risk, so that potential disasters can be reduced. The present study clearly aims to delineate the landslide susceptibility zones so that landslide hazard and risk can be properly managed. The landslides occurred in Amboori region, the southeastern part of the Thiruvananthapuram district, Kerala, India has been analyzed using GIS and remote sensing techniques to identify the landslide susceptibility zones. Frequency Ratio analysis is made use of in this study. The landslide hazard zonation has been done based on various terrain parameters as well as various thematic layers that affect directly or indirectly slope failure process. The results of landslide analysis not only helps to map and monitor landslides, but also to predict future slope failures which is valuable for a decision maker in landslide prone areas.

Open Access Original Research Article

Algorithmic Meta-analysis of the Effects of Social Services on the Vulnerable Population

J. Carreón-Guillén, C. Y. Quiroz-Campas, E. Bolivar-Mojica, O. Coronado-Rincón, J. Hernández-Valdés, N. A. Morales-Ortega, C. García-Lirios

Journal of Geography, Environment and Earth Science International, Page 1-9
DOI: 10.9734/jgeesi/2019/v22i230141

Meta-analytic studies are distinguished by comparing literature that reports positive effects with respect to literature that warns of spurious or negative effects. The aim of the present work was to establish the proportion of probabilities between categories and subcategories extracted from the consulted, updated and specialized literature. A documentary study was carried out with a selection of sources indexed to international repositories such as Copernicus, Dialnet, Ebsco, Latindex, Redalyc, Scielo. An indistinct scenario was found, even though the literature that reports positive effects on the quality of life and the subjective well-being of public health services prevails; suggesting the extension of the work to repositories like WoS and Scopus.

Open Access Original Research Article

Magnetic Susceptibility Mapping of Rocks and Depth Estimation of Anomalies: A Case Study of Igarra and Its Environs

V. N. Nwugha, D. O. Ikoro, C. N. Okeke-Oguegbe, A. C. Ezebunanwa

Journal of Geography, Environment and Earth Science International, Page 1-11
DOI: 10.9734/jgeesi/2019/v22i230142

Magnetic Susceptibility Mapping and Depth Estimation of Anomalies were carried out on Igarra and its environs, Southwest Nigeria. This was to assist in mineral exploration in the area. The study area is located within the Igarra schist belt which is underlain by rocks of Precambrian basement complex. The Total Magnetic Field over the study area was obtained by digitizing the aeromagnetic map of Auchi (Sheet 226) acquired from the Nigerian Geologic Survey Agency (NGSA). A total of 19 (nineteen) magnetic anomalies were identified on the map; 5 magnetic highs and 14 lows. 8 anomalies have a NW-SE strike direction, 4 in the NE-SW and 7 in the E-W direction. The amplitude of the anomalies and strength of the total field were used to determine the susceptibility values for each of the anomalies. The Susceptibility values were used to generate a Magnetic Susceptibility map of the study area on SURFER 13 software. TMI plots on the anomalies were carried out on MICROSOFT EXCEL 2010. Depth estimates of the anomalies were got using three methods: The Half Width rule, Hannel rule and Tirburg rule. The Susceptibility map shows a noticeable pattern of increase in magnetic minerals from the Southwestern to the Northeastern part of the map. The Depth of the basement anomalies were relatively shallow ranging from 0.8 km to 2.6 km. The results of this work provide a preliminary guide to those that engage in mineral exploration / exploitation in the area.

Open Access Original Research Article

An Analysis of Human Survival Strategies in Difficult Environments: A Case Study of the Kom Highlands in Cameroon

Solange Akhere Gwan, Victor Konfor Ntoban, Jude N. Kimengsi

Journal of Geography, Environment and Earth Science International, Page 1-13
DOI: 10.9734/jgeesi/2019/v22i230144

Mountainous regions and other difficult terrains, the world over, present significant challenges to communities as they strive to carry out their daily activities. In spite of these difficulties, strategies have been employed by communities to cope with such difficulties, yielding diverse outcomes. The extent and outcomes of survival strategies employed by communities, still beg for scientific and policy edification, in the context of the Western Highlands of Cameroon. This paper contributes to bridge the knowledge gap, by examining the survival strategies employed by locals in the Kom Highlands to confront the challenges presented by the harsh physical environment. 10 key informant interviews were conducted accompanied by a representative survey of 60 farming household heads, drawn from 5 villages in Fundong. The data were analyzed using both descriptive and inferential statistical tools, including the Chi-square analysis. The results reveal that Kom displays a plethora of harsh physical environmental characteristics, prominent among them are the hilly and difficult terrain, the poor soil quality and the generally cold weather conditions witnessed here. Faced with these challenges, the population employed a number of survival strategies in the agricultural sector, housing and transport. These strategies are unfortunately inadequate and such inadequacy is accounted for by their low level of technology, poverty, ignorance and other cultural factors, among others. The study therefore recommends the need to improve and modernize agriculture through the provision of fertilizers at subsidized rates to the farming population, the encouragement of effective slope stabilization and terracing and also for rigorous government intervention in terms of road and fly over constructions.