Search Results

Now showing 1 - 3 of 3

Some of the metrics are blocked by your
consent settings
Maximum electron concentration and total electron content of the ionosphere over Concepción, Chile, prior to the 27 February 2010 earthquake
(2013)
Ovalle, E.M.
;
Bravo M.A.
;
Villalobos Núñez, Carlos Ulises
;
Foppiano A.J.
Ionospheric variability observed prior to mayor earthquakes has been studied for decades. In particular, in many such studies the identification of ionospheric precursors of large earthquakes has been regarded as a specific goal. This paper analyses the observations of the maximum electron concentration (NmF2) over Concepción (36.8°S; 73.0°W) and of the total electron content (TEC) for an area covering the rupture zone corresponding to the very large Chile earthquake of 27 February 2010. The analyses used here are similar to those published before for many earthquakes in Taiwan, Japan and Russia. Possible NmF2 and TEC precursors are compared with other precursors proposed for the same earthquake using different TEC determinations and satellite observations of electron/ion concentration, energetic particle bursts and electromagnetic emissions. Some possible precursors derived from the various observations are consistent with each other. However, none can be unambiguously associated to the Chilean earthquake.
Some of the metrics are blocked by your
consent settings
High Prevalence of Food Insecurity and Factors Associated with Haitian Immigrants in Southern Chile
(2019)
Eduard Maury-Sintjago
;
Alejandra Rodríguez-fernández
;
Danny E. García
;
Julio Parra-Flores
The objective was to determine the association between sociodemographic factors and food insecurity (FI) in Haitian immigrants in southern Chile. An analytical cross-sectional design was used. The sample consisted of Haitian immigrants residing in Southern Chile, who were recruited from community centers and completed a sociodemographic questionnaire and the Latin-American and Caribbean Food Security Scale. Multivariable analyses were performed to identify factors associated with FI. FI prevalence in the 234 participants was 78%; 60% had severe FI. Having children (OR 3.6; 95% CI 1.6–7.4), limited Spanish proficiency (OR 3.5; 95% CI 1.8–7.3), no access to basic services (OR 2.8; 95% CI 1.2–6.4), and not being a legal permanent resident (OR 2.4; 95% CI 1.1–6.1) were associated with significantly higher odds of FI. Over three-quarters of Haitian immigrants in southern Chile suffer from FI. Tailored intervention strategies are needed to address this major public-health issue, with a special focus on those at highest risk, including families with children, and those with limited Spanish proficiency, no access to basic services, and without legal permanent resident status.
Some of the metrics are blocked by your
consent settings
A new multi-proxy record of environmental change over the last 1000 years on Chiloé Island: Lake Pastahué, south-central Chile (42°S)
(2018)
J. Max Troncoso Castro
;
Carolina Vergara
;
Denisse Alvarez
;
Gustavo Díaz
;
Pablo Fierro
<jats:p> Knowledge of past environmental and climatic conditions of lake ecosystems on Chiloé Island on a millennial scale is limited. Hence, this study fills a gap in our understanding of this part of southern Chile. The aim of this study was to reconstruct the environmental and climatic history of the last 1000 years of Lake Pastahué through a multi-proxy sediment core analysis. The 1-m-long core was subsampled every centimeter for the organic matter, magnetic susceptibility, grain-size distribution, and biological indicator (pollen, chironomids) analyses. The age model was constructed from <jats:sup>210</jats:sup>Pb, <jats:sup>137</jats:sup>Cs, and <jats:sup>14</jats:sup>C activity. Pollen results revealed a North Patagonian forest composition represented by Nothofagus, Weinmannia, Drimys, Tepualia, Myrtaceae, Poaceae, and Pteridophyta. The abundance of Rumex and Pinus in the most recent part of the pollen assemblage reflects a clear anthropogenic impact. The sedimentological parameters and chironomid assemblage show similar variations, which highlight changes in the trophic state of the lake. The changes observed in all proxies suggest the influence of climate events such as the ‘Medieval Climate Anomaly’ (MCA) and ‘Little Ice Age’ (LIA). The variations observed since the beginning of the 20th century could be the result of the combined effect of anthropogenic activities and the increase in temperature recorded in south-central Chile and Patagonia. </jats:p>

Artículos de Investigación

Browse

Filters

Advanced Search

Filter by

Settings

Sort By

Results per page

Search Results