Search results for " El Salvador"
showing 6 items of 6 documents
Transition from mildly-tholeiitic to calc-alkaline suite: the case of Chichontepec volcanic centre, El Salvador, Central America
1998
Abstract The Chichontepec volcano is a Plio-Pleistocene composite volcano that erupted lavas ranging from high-alumina basalts to dacites. It experienced a caldera-forming paroxysmal eruption during the early Pleistocene. Pre-caldera lavas are mildly tholeiitic and they evolved mainly by low pressure crystal fractionation, notwithstanding the fact that most mafic lavas (low-MgO high-alumina basalts) retain traces of polybaric evolution. Conversely, post-caldera lavas, which are mainly pyroxene andesites, are clearly calc-alkaline, having evolved by open-system crystal fractionation. Sr–Nd isotopic data and trace elements characteristics indicate that the same mantle source was involved in t…
Predicting depositional areas of landslide susceptibility comparing four datasets extracted from landslide area: a case of study after rainfall-induc…
Hurricane Ida and low-pressure system 96E crossed Central American countries in 2009. However, in El Salvador, the torrential rainfalls caused many flooding and landslides. As a result, over 200 causalities and the destruction of several villages, and bridges occurred along the mountain slopes. The remote analysis allowed us to prepare an inventory of landslides that occurred after the Hurricane in a basin located in the northern part of Ilopango Caldera. Five groups of data sets were created using selected pixels of each landslide area in order to evaluate the capacity to predict the lowest and the entire landslide area. Multivariate Adaptive Regression Splines (MARS) were employed to mode…
Il Salvador si avvia a pianificare città e territori: un’esperienza pilota partecipativa a Santa Marta, a partire da un lungo lavoro psicologico
2015
Gli autori descrivono un caso di cooperazione allo sviluppo iniziato nel 2008 come intervento di Psicologi nel mondo, continuato anno dopo anno, generatore di una esperienza di pianificazione partecipativa a cura del Politecnico di Torino nel 2014. Le riflessioni teoriche sul rapporto interdisciplinare tra psicologia e pianificazione si ancorano a un caso studio locale, la piccola comunità di Santa Marta, mentre il Salvador spinge verso la pianificazione città e territori. The authors describe a case of cooperation that began in 2008 as an intervention of Psicologi nel mondo, continued year after year, generating an experience of participatory planning carried out by the Politecnico di Tori…
LANDSLIDE SUSCEPTIBILITY MODELS FOR STORM-TRIGGERED MULTIPLE OCCURRING DEBRIS FLOWS IN EL SALVADOR
Predicting Earthquake-Induced Landslides by Using a Stochastic Modeling Approach: A Case Study of the 2001 El Salvador Coseismic Landslides
2023
In January and February 2001, El Salvador was hit by two strong earthquakes that triggered thousands of landslides, causing 1259 fatalities and extensive damage. The analysis of aerial and SPOT-4 satellite images allowed us to map 6491 coseismic landslides, mainly debris slides and flows that occurred in volcanic epiclastites and pyroclastites. Four different multivariate adaptive regression splines (MARS) models were produced using different predictors and landslide inventories which contain slope failures triggered by an extreme rainfall event in 2009 and those induced by the earthquakes of 2001. In a predictive analysis, three validation scenarios were employed: the first and the second …