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The flow under an Eyring-Powell description has attracted interest to model different scenarios related with non-Newtonian fluids. The goal of the present study is to provide analysis of solutions to a one-dimensional Eyring-Powell fluid in Magnetohydrodynamics (MHD) with general initial conditions. Firstly, regularity and bounds of solutions are shown as a baseline to support the construction of existence and uniqueness results. The existence analysis is based on the definition of a Hamiltonian that constitutes the underlying theory to obtain stationary profiles of solutions that are validated with a numerical approach. Afterwards, non-stationary profiles of solutions are explored based on an asymptotic approximation to a Hamilton-Jacobi type of equation. To this end, an exponential scaling is considered together with perturbation methods. Finally, a region of validity for such exponential scaling is provided.

The goal of this paper is to provide analytical assessments to a fluid flowing in a porous medium with a non-linear diffusion linked to a degenerate diffusivity. The viscosity term is formulated with an Eyring-Powell law, together with a non-homogeneous diffusion typical of porous medium equations (as known in the theory of partial differential equations). Further, the equation is supplemented with an absorptive reaction term of Darcy-Forchheimer, commonly used to model flows in porous medium. The work starts by analyzing regularity, existence and uniqueness of solutions. Afterwards, the problem is transformed to study travelling wave kind of solutions. An asymptotic expansion is considered with a convergence criteria based on the geometric perturbation theory. Supported by this theory, there exists an exponential decaying rate in the travelling wave profile. Such exponential behaviour is validated with a numerical assessment. This is not a trivial result given the degenerate diffusivity induced by the non-linear diffusion of porous medium type and suggests the existence of regularity that can serve as a baseline to construct numerical or energetic approaches.

Abstract Long-term adherence to antiosteoporosis medication (AOM) in the setting of a fracture liaison service (FLS) are not well known. Patients ≥ 50 with hip fracture seen in an FLS and recommended for treatment to prevent new fractures were analyzed. Baseline data included demographics, identification mode, previous treatment and FRAX items. Patient records were reviewed 3–8 years later, and these data were collected: (1) survival; (2) major refracture; (3) initiation of treatment, proportion of days covered (PDC) and persistence with AOM. 372 patients (mean age, 79 years; 76% women) were included. Mean follow-up was 47 months, 52 patients (14%) had a refracture (22 hip) and 129 (34.5%) died. AOM was started in 283 patients (76.0%). Factors associated with initiation of AOM were previous use of bisphosphonate (OR 9.94; 95% CI 1.29–76.32) and a lower T-score lumbar (OR 0.80; 95% CI 0.65–0.99). Persistence decreased to 72.6%, 60% and 47% at 12, 36 and 60 months. A PDC > 80% was confirmed in 208 patients (55.7%) and associated with previous use of bisphosphonate (OR 3.38; 95% CI 1.34–8.53), treatment with denosumab (OR 2.69; 95% CI:1.37–5.27), and inpatient identification (OR 2.26; 95% CI 1.18–4.34). Long-term persistence with AOM was optimal in patients with hip fracture seen at an FLS. A PDC > 80% was associated with inpatient identification and prescription of denosumab.

Abstract The Anthropological Theory of Didactics has been applied to the field of didactics of mathematics with remarkable success. Fluid Mechanics is a discipline with a strong mathematical background, where mathematics is used for modeling the continuous nature. In addition, the Fluid Mechanics concepts are essential for the future engineer or scientist. For this reason, it is worth thinking whether the content that developed in engineering schools or science faculties are those demanded by the future professionals. The analysis has been done within the context of a case study framed in the Spanish noosphere, more particularly Universities and Companies. In this direction, the objective of this article is to know the institutional distance between the University and society as a demander of technologies based on Fluid Mechanics. To this end, the methodology based on the issuance of a questionnaire to experts focused on aspects such as present and emerging content associated with the Fluid Mechanics of an engineering degree is used. Note that the number of experts selected is reduced so as to consider the study as a sourcing for introducing expert thoughts on the fluid mechanics conception between university and companies. The results highlight the existence of an institutional distance between the University and the Enterprise (as a technology executor) in the conception of contents, thus establishing an area of potential improvement within the noosphere associated with fluid mechanics in Spain. Highlights Questionnaire to experts to understand the current institutional relations between University and Company in the Spanish system. Application of the Anthropological Theory of Didactics (ATD) techniques to Fluid Mechanics. Confirmation of an institutional distance between University and Companies in Fluid Mechanics conceptions.

We study existence, uniqueness and positivity conditions for a cooperative system formulated with a high order diffusion. In addition, we show and characterize the instabilities due to the high order diffusion for which a positivity and a comparison principle hold after rescaling. Instabilities shall be understood as the oscillatory behaviour of solutions acting as an inherent feature driven by complex exponential bundles of solutions. Firstly, a shooting method approach is used to show the existence of such instabilities. Afterwards, the existence of solutions is assessed in the self-similar approach and characterized by analytical and numerical evidences for a single equation in and for the complete system. Finally, a positive kernel is shown to exist and a sharp estimation is obtained.

The goal of this study is to provide analytical and numerical assessments to a fluid flow based on an Eyring–Powell viscosity term and a Darcy–Forchheimer law in a porous media. The analysis provides results about regularity, existence and uniqueness of solutions. Travelling wave solutions are explored, supported by the Geometric Perturbation Theory to build profiles in the proximity of the equation critical points. Finally, a numerical routine is provided as a baseline for the validity of the analytical approach presented for low Reynolds numbers typical in a porous medium.

The goal of this study is to provide an analysis of a Fisher-KPP non-linear reaction problem with a higher-order diffusion and a non-linear advection. We study the existence and uniqueness of solutions together with asymptotic solutions and positivity conditions. We show the existence of instabilities based on a shooting method approach. Afterwards, we study the existence and uniqueness of solutions as an abstract evolution of a bounded continuous single parametric (t) semigroup. Asymptotic solutions based on a Hamilton–Jacobi equation are then analyzed. Finally, the conditions required to ensure a comparison principle are explored supported by the existence of a positive maximal kernel.

This work provides an analytical approach to characterize and determine solutions to a porous medium system of equations with views in applications to invasive-invaded biological dynamics. Firstly, the existence and uniqueness of solutions are proved. Afterwards, profiles of solutions are obtained making use of the self-similar structure that permits showing the existence of a diffusive front. The solutions are then studied within the Travelling Waves (TW) domain showing the existence of potential and exponential profiles in the stable connection that converges to the stationary solutions in which the invasive species predominates. The TW profiles are shown to exist based on the geometry perturbation theory together with an analytical-topological argument in the phase plane. The finding of an exponential decaying rate (related with the advection and diffusion parameters) in the invaded species TW is not trivial in the nonlinear diffusion case and reflects the existence of a TW trajectory governed by the invaded species runaway (in the direction of the advection) and the diffusion (acting in a finite speed front or support).

Background and aims: ERCP during pregnancy is always challenging for the entire team performing the endoscopic intervention. In this study techniques and different interventional aspects used at several centres about the clinical experience on ERCP in pregnant women are analyzed. Patients and methods: the practice on ERCP in pregnant women in six centers during a period of ten years is reported. Results: eleven patients were included in the study. Mean age was 30.6 years. Indication for ERCP was always symptomatic common bile duct stone (CBDS) disease. Before the procedure abdominal ultrasound was performed at all times and magnetic resonance cholangiopancreatography in four occasions. Conscious sedation by means of midazolam and fentanyl or meperidine was applied. Sphincterotomes and guidewires were used for bilary cannulation. Sometimes, rapid exchange platforms with short-length guidewires controlled by the same endoscopist were employed. Biliary cannulation was confirmed in 9 occasions by bile aspiration. In five procedures, a mean of 30 seconds of fluoroscopy was used, both to verify cannulation and to corroborate complete CBDS clearance. These patients had the pelvic zone protected with a lead shield and radiation dose was measured. Ten biliary sphincterotomies were performed followed by CBDS extraction. Two plastic stents were inserted. Relief of biliary obstruction was attained in all circumstances. Only one patient had hyperamylasemia after ERCP. All pregnant women had healthy foetuses with normal deliveries. Conclusions: with experience, ERCP appears to be a safe technique during pregnancy. With simple measures fluoroscopic time can be diminished or even abolished. It seems that ERCP during pregnancy is underused in our working areas, although it has shown to be a useful technique for relieving biliary obstruction.Antecedentes y objetivos: la CPRE realizada durante el embarazo constituye siempre un reto para todo el equipo que participa en la intervención endoscópica. En este estudio se analizan los diferentes aspectos y técnicas en varios centros sobre la experiencia clínica de la CPRE realizada en mujeres gestantes. Pacientes y métodos: experiencia en seis centros sobre las CPRE en embarazadas durante 10 años. Resultados: se incluyeron 11 pacientes con edad media de 30,6 años. La indicación fue siempre coledocolitiasis sintomática. Antes de la CPRE se realizó ecografía abdominal en todos los casos y colangiorresonancia en 4. Se utilizó sedación consciente con midazolam y fentanilo o meperidina. Para la canulación biliar se utilizaron esfinterotomos y guías. A veces con sistemas de intercambio rápido y guías cortas manejadas por el endoscopista. En 9 ocasiones la confirmación de canulación biliar fue por aspiración de bilis. Se utilizó fluoroscopia (media de 30 segundos) en 5 procedimientos, para confirmar la canulación biliar y asegurar la extracción completa de coledocolitiasis. En estos casos se protegió la zona pélvica con un mandil de plomo y se midió la radiación. Se realizaron 10 esfinterotomías biliares con extracción de las coledocolitiasis y se insertaron dos prótesis plásticas resolviéndose en todos los casos la obstrucción biliar. Tras la CPRE solo hubo hiperamilasemia en una paciente. Todas las gestantes dieron a luz fetos sanos con partos normales. Conclusiones: con experiencia, la CPRE es una técnica segura durante el embarazo. El tiempo de fluoroscopia puede reducirse incluso suprimirse con medidas sencillas. Parece que, en nuestro medio, la CPRE es poco utilizada en la gestación, aunque es una forma útil para desobstruir la vía biliar.

Background: in recent years many factors have been shown to influence dose received by the patient during ERCP. Therefore it is necessary to update radio induced cancer risk. Objectives: to calculate lifetime attributable risk of cancer during ERCP. To compare the risk with the most common X-ray examinations. Design: descriptive study with 393 consecutive ERCP performed at one center. Equipment used was Philips BV pulsera. In each exploration demographic and anthropometric variables of the patient were collected. Dosimetric quantities were calculated from exposure parameters. Effective dose was estimated using specific conversion factors. Organ doses and radio induced cancer incidence was estimated. Results: dose area product was 0.82 mGym² (IQR 0.4-1.5) with an average fluoroscopy time of 2 minutes and 45 seconds. Entrance surface dose was 30.7 mGy (IQR 15-60.8) and effective dose was 0.44 mSv (IQR 0.2-0.9). Multivariate analysis identified that difficult papillary cannulation (β0.4; p = 0.009), patient age (β-0.01; p = 0.001) and therapeutic applied (β= 0.89; p < 0.001) influenced dose-area product. The ERCP dose would be equivalent to the radiation received by twenty chest radiographs and would be about fourteen times smaller than a barium enema or twenty times less than that received during an abdominal CT. Lifetime attributable risk of cancer incidence was 4.08 and 16.81 per million procedures in diagnostic and therapeutic ERCP respectively. Conclusions: from the radiological point of view, ERCP is a safe technique that uses low exposure levels compared to other explorations commonly used in medicine. It implies a reasonably low risk of radio induced cancer.

During the Late Pleistocene-to-Holocene, the mafic Planchón volcano (35.2 °S, Southern Andes) experienced two important destructive events: a sector collapse to the west and a multiphase explosive eruption transforming the east summit area. We provide new field and laboratory evidence, including geochemical, geochronologic, and geological-morphological analysis, to reconstruct the evolution, triggering mechanisms, and physical parameters of these events.The lateral collapse (48~ka BP) was mainly predisposed by a tectonically westward-inclined substratum and rapid edifice growth rates (0.3–0.48 km3 ka-1). The resulting Planchón-Teno debris avalanche became valley-confined traveling at c. 260 km h-1 up to 95 km distance and forming an 8.6 ± 1.3 km3 deposit. The resulting 4.1 km wide amphitheater was later destroyed at c. 7 ka BP by the multiphase Valenzuela phreatomagmatic eruptions, forming a c. 2.5 km diameter caldera. The case of the Planchón volcano warns that rapidly growing mafic volcanoes imply a substantial catastrophic hazard increase for the surrounding areas.

Background: in recent years many factors have been shown to influence dose received by the patient during ERCP. Therefore it is necessary to update radio induced cancer risk. Objectives: to calculate lifetime attributable risk of cancer during ERCP. To compare the risk with the most common X-ray examinations. Design: descriptive study with 393 consecutive ERCP performed at one center. Equipment used was Philips BV pulsera. In each exploration demographic and anthropometric variables of the patient were collected. Dosimetric quantities were calculated from exposure parameters. Effective dose was estimated using specific conversion factors. Organ doses and radio induced cancer incidence was estimated. Results: dose area product was 0.82 mGym² (IQR 0.4-1.5) with an average fluoroscopy time of 2 minutes and 45 seconds. Entrance surface dose was 30.7 mGy (IQR 15-60.8) and effective dose was 0.44 mSv (IQR 0.2-0.9). Multivariate analysis identified that difficult papillary cannulation (β0.4; p = 0.009), patient age (β-0.01; p = 0.001) and therapeutic applied (β= 0.89; p < 0.001) influenced dose-area product. The ERCP dose would be equivalent to the radiation received by twenty chest radiographs and would be about fourteen times smaller than a barium enema or twenty times less than that received during an abdominal CT. Lifetime attributable risk of cancer incidence was 4.08 and 16.81 per million procedures in diagnostic and therapeutic ERCP respectively. Conclusions: from the radiological point of view, ERCP is a safe technique that uses low exposure levels compared to other explorations commonly used in medicine. It implies a reasonably low risk of radio induced cancer.

The goal of this paper is to provide analytical assessments to a fluid flowing in a porous medium with a non-linear diffusion linked to a degenerate diffusivity. The viscosity term is formulated with an Eyring-Powell law, together with a non-homogeneous diffusion typical of porous medium equations (as known in the theory of partial differential equations). Further, the equation is supplemented with an absorptive reaction term of Darcy-Forchheimer, commonly used to model flows in porous medium. The work starts by analyzing regularity, existence and uniqueness of solutions. Afterwards, the problem is transformed to study travelling wave kind of solutions. An asymptotic expansion is considered with a convergence criteria based on the geometric perturbation theory. Supported by this theory, there exists an exponential decaying rate in the travelling wave profile. Such exponential behaviour is validated with a numerical assessment. This is not a trivial result given the degenerate diffusivity induced by the non-linear diffusion of porous medium type and suggests the existence of regularity that can serve as a baseline to construct numerical or energetic approaches. [ABSTRACT FROM AUTHOR]

The goal of this study is to provide an analysis of a Fisher-KPP non-linear reaction problem with a higher-order diffusion and a non-linear advection. We study the existence and uniqueness of solutions together with asymptotic solutions and positivity conditions. We show the existence of instabilities based on a shooting method approach. Afterwards, we study the existence and uniqueness of solutions as an abstract evolution of a bounded continuous single parametric (t) semigroup. Asymptotic solutions based on a Hamilton–Jacobi equation are then analyzed. Finally, the conditions required to ensure a comparison principle are explored supported by the existence of a positive maximal kernel. [ABSTRACT FROM AUTHOR]

The goal of this study is to provide analytical and numerical assessments to a fluid flow based on an Eyring–Powell viscosity term and a Darcy–Forchheimer law in a porous media. The analysis provides results about regularity, existence and uniqueness of solutions. Travelling wave solutions are explored, supported by the Geometric Perturbation Theory to build profiles in the proximity of the equation critical points. Finally, a numerical routine is provided as a baseline for the validity of the analytical approach presented for low Reynolds numbers typical in a porous medium. [ABSTRACT FROM AUTHOR]

Se creó y aplicó un modelo económico-matemático de programación entera binaria y un sistema informático, con el objetivo de encontrar la estructura óptima de variedades y cepas en empresas azucareras del territorio oriental, lo cual constituye una novedad científica respecto a estudios precedentes. El diseño, creación y aplicación de un sistema informático soportado en los modelos matemáticos antes mencionados ha permitido un incremento en la producción de caña de 18 024,04 t, que representa un ingreso bruto adicional para las entidades productoras de $ 917 423,56.

This work provides an analytical approach to characterize and determine solutions to a porous medium system of equations with views in applications to invasive-invaded biological dynamics. Firstly, the existence and uniqueness of solutions are proved. Afterwards, profiles of solutions are obtained making use of the self-similar structure that permits showing the existence of a diffusive front. The solutions are then studied within the Travelling Waves (TW) domain showing the existence of potential and exponential profiles in the stable connection that converges to the stationary solutions in which the invasive species predominates. The TW profiles are shown to exist based on the geometry perturbation theory together with an analytical-topological argument in the phase plane. The finding of an exponential decaying rate (related with the advection and diffusion parameters) in the invaded species TW is not trivial in the nonlinear diffusion case and reflects the existence of a TW trajectory governed by the invaded species runaway (in the direction of the advection) and the diffusion (acting in a finite speed front or support). [ABSTRACT FROM AUTHOR]

Knowledge fragmentation separates educational organizations from reality and calls into question the legitimacy of the academic endeavors before society. This research seeks to contribute to the resolution of knowledge management problems associated with interdisciplinary work in a faculty of arts. The exploratory and descriptive study analyzes the implicit and explicit knowledge of faculty professors through the use of interviews and structured surveys. The sample was formed by 22 teachers of a Colombian university. The results show a potential interaction between team members of the faculty, suitable for exploration in project development, for which it is necessary to focus on a vision and create spaces for collective project construction from a systemic perspective. [ABSTRACT FROM AUTHOR]

Abstract  The August 1991 eruptions of Hudson volcano produced ~2.7 km3 (dense rock equivalent, DRE) of basaltic to trachyandesitic pyroclastic deposits, making it one of the largest historical eruptions in South America. Phase 1 of the eruption (P1, April 8) involved both lava flows and a phreatomagmatic eruption from a fissure located in the NW corner of the caldera. The paroxysmal phase (P2) began several days later (April 12) with a Plinian-style eruption from a different vent 4 km to the south-southeast. Tephra from the 1991 eruption ranges in composition from basalt (phase 1) to trachyandesite (phase 2), with a distinct gap between the two erupted phases from 54–60 wt% SiO2. A trend of decreasing SiO2 is evident from the earliest part of the phase 2 eruption (unit A, 63–65 wt% SiO2) to the end (unit D, 60–63 wt% SiO2). Melt inclusion data and textures suggest that mixing occurred in magmas from both eruptive phases. The basaltic and trachyandesitic magmas can be genetically related through both magma mixing and fractional crystallization processes. A combination of observed phase assemblages, inferred water content, crystallinity, and geothermometry estimates suggest pre-eruptive storage of the phase 2 trachyandesite at pressures between ~50–100 megapascal (MPa) at 972 ± 26°C under water-saturated conditions (log fO2 –10.33 (±0.2)). It is proposed that rising P1 basaltic magma intersected the lower part of the P2 magma storage region between 2 and 3 km depth. Subsequent mixing between the two magmas preferentially hybridized the lower part of the chamber. Basaltic magma continued advancing towards the surface as a dyke to eventually be erupted in the northwestern part of the Hudson caldera. The presence of tachylite in the P1 products suggests that some of the magma was stalled close to the surface ( [ABSTRACT FROM AUTHOR]

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La fragmentación del conocimiento distancia a las organizaciones educativas de la realidad y pone en entredicho la legitimidad de la academia ante la sociedad. Esta investigación busca contribuir en la resolución de problemas asociados a la gestión del conocimiento y el trabajo interdisciplinar en una Facultad de Artes. El estudio fue de tipo exploratorio y descriptivo, analizó el conocimiento implícito y explícito de los docentes mediante la aplicación de una encuesta estructurada y entrevistas realizadas a los docentes. La muestra estuvo conformada por 22 docentes de una universidad colombiana. Se encontró que existe un potencial de interacción entre los integrantes del equipo que puede ser explorado en el desarrollo de proyectos, para lo cual es necesario enfocar la visión y generar espacios para la construcción colectiva de proyectos desde una perspectiva sistémica

Introducción: el embarazo en la adolescencia puede tener consecuencias adversas tanto para la madre como el recién nacido. Objetivos: determinar los resultados perinatales de gestantes adolescentes del municipio Jaruco durante el 2012.Métodos: se realizó un estudio analítico longitudinal prospectivo a partir de un universo de 64 embarazadas adolescentes y una muestra inicial de 48 gestantes escogidas al azar que conformó el grupo de expuestas al factor de estudio y se dispuso de un grupo de no expuestas de 20 o más años de igual cantidad de gestantes siguiendo una relación 1:1; así, la muestra definitiva quedó conformada por 42 y 45 en cada grupo respectivo. Los datos se recolectaron mediante revisión de las historias clínica y obstétrica y como medidas estadísticas se emplearon la media, desviación estándar, porcentaje, test de Student, Chi cuadrado y riesgo relativo. Resultados: en las gestantes adolescentes hubo significativamente mayor preeclampsia (RR = 1,81), oligoamnios (RR = 1,98), amenaza de parto pretérmino (RR = 2,04) y partos pretérmino (RR = 1,98), bajo peso al nacer (RR = 2,04) y Apgar bajo al minuto de vida (RR = 1,81); también se presentó más distrés respiratorio en los neonatos (RR = 1,99) y endometritis puerperal (RR = 1,88). No hubo diferencias entre ambos grupos en otras afecciones propias del embarazo o complicaciones neonatales y puerperales, ni en la vía del parto.Conclusiones: el embarazo en la adolescencia incrementa el riesgo de resultados perinatales adversos, tanto para la madre, como para el feto y el recién nacido.

The current article presents, rou ghly, José Martí's vision concerning sexual education, and the presence of h i s ideas and work in the Sexual Education , conceived and implemented in Cuba.

El estudio presenta una reflexión sobre la formacion de competencias científicas en los estudiantes de secundaria de dos países de América Latina, Argentina y Costa Rica. Asimismo valora el grado de pertinencia y acercamiento que tienen los diseños curriculares de Ciencias Naturales implementados en estos países con el logro de competencias científicas para la vida. Para valorar el nivel de desarrollo de las competencias científicas alcanzado por los estudiantes, se disgrego y examino estas en cada una de sus dimensiones: capacidades, conocimientos, actitudes y contextos.

The present article describes the relevant conception of Mar ti ́s ideas about the indissoluble bond that exists between education and health; besides, the authors stand out the validity and the total agreement of The Apostle’s ideas with the current principles, that determine the health work in the Cuban school syst em, and the most remarkable importance that Marti conferred to the education for health.

El estudio presenta una reflexión sobre la formación de competencias científicas en los estudiantes de secundaria de dos países de América Latina, Argentina y Costa Rica. Asimismo, valora el grado de pertinencia y acercamiento que tienen los diseños curriculares de Ciencias Naturales implementados en estos países con el logro de competencias científicas para la vida. En la segunda fase de la investigación se valora el nivel de desarrollo de las competencias científicas alcanzado por los estudiantes. Para esto se disgregó y examinó la competencia científica en cada una de sus dimensiones: capacidades, conocimientos, actitudes y contextos.

The present article is part of a document to support teaching, and it is aimed at helping teachers and students in the subject Reflexion and Debate. In the research we offer a general assessment of the content of ̈La Edad de Oro ̈, making emphasis mainly in its didactic and educative value and the peculiar pedagogic approach used by Marti in the writing and selection of the works presented in the book. We also argue about the sharpness of the language used, as well as the methods that the author uses to awaken in the readers the wish for useful knowledge which enrich their moral and spiritual world.

The epicentre of the long-lasting seismic crisis started on the evening of January 22,2007 and it was located 20 km to the west of Puerto Chacabuco in the Patagonian fjordland, Chile (45°25'S). Approximately 7,000 events were recorded up to early May, four of which reached magnitudes greater than 5 (Richter), with local intensities up to VII in Puerto Chacabuco and Puerto Aisén and VI in Coihaique. The seismic swarm was located within the Liquiñe-Ofqui Fault Zone (LOFZ), which controls the emplacement of several monogenetic volcanic cones and larger stratovolcanoes. The January 23 (Ms 5,2) and April 1 (Ms 5,4) events caused minor damages in salmón industry installations near the epicentral zone, however the earthquake that oceurred at 13:54 hours (local time) on April 21 (Mw 6,2) triggered various mass movements on the Fiordo Aisén slopes and generated tsunamis. Debris flows and tsunami waves caused the death of three people and the disappearance of seven, in addition to severe damages to the salmón industry installations. A similar phenomenon had oceurred in 1927, but then fewer people inhabited the área. Initially, confusión dominated the scientific coordination of the emergeney management due to seismic data misinterpretation.En la noche del 22 de enero de 2007 comenzó una crisis sísmica, cuyos epicentros se localizaron principalmente en el fiordo Aisén, a unos 20 km al noroeste de Puerto Chacabuco, en la zona archipelágica de Patagonia, en Chile (45°25'S). Hasta comienzos de mayo, los sismógrafos habían registrado cerca de 7.000 sismos, de los cuales cuatro habían sobrepasado la magnitud 5 (Richter), con intensidades locales de hasta VII en Puerto Chacabuco y Puerto Aisén y VI en Coihaique. El enjambre sísmico está asociado a estructuras geológicas de la Zona de Falla Liquiñe-Ofqui (ZFLO) la cual, además, controla el emplazamiento de numerosos conos volcánicos, así como estratovolcanes mayores. Aunque los sismos del 23 de enero (Ms 5,2) y 1 de abril (Ms 5,4) de 2007 produjeron algunos daños menores en instalaciones de salmoneras cercanas a la zona epicentral, el sismo ocurrido a las 13:54 hora local del 21 de abril (Mw 6,2) fue el que produjo los mayores efectos, generándose diversos tipos de remociones en masa en laderas de las riberas del fiordo Aisén, tres de las cuales, con los mayores volúmenes, generaron veloces tsunamis. Flujos de detritos y tsunamis causaron la muerte de tres personas y la desaparición de siete, y severos daños en las instalaciones de las salmoneras. En una primera instancia, las características del proceso probablemente similar a uno ocurrido en 1927, cuando en la zona había escasa población, fueron novedosas y produjeron confusión y errores en la coordinación del manejo de la emergencia.