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In volcanic regions, reliable estimates of mechanical properties for specific volcanic events such as cyclic inflation-deflation cycles by magmatic intrusions, thermal stressing, and high temperatures are crucial for building accurate models of volcanic phenomena. This study focuses on the challenge of characterizing volcanic materials for the numerical analyses of such events. To do this, we evaluated the physical (porosity, permeability) and mechanical (strength) properties of basaltic rocks at Pacaya Volcano (Guatemala) through a variety of laboratory experiments, including: room temperature, high temperature (935 C), and cyclically-loaded uniaxial compressive strength tests on as-collected and thermally-treated rock samples. Knowledge of the material response to such varied stressing conditions is necessary to analyze potential hazards at Pacaya, whose persistent activity has led to 13 evacuations of towns near the volcano since 1987. The rocks show a non-linear relationship between permeability and porosity, which relates to the importance of the crack network connecting the vesicles in these rocks. Here we show that strength not only decreases with porosity and permeability, but also with prolonged stressing (i.e., at lower strain rates) and upon cooling. Complimentary tests in which cyclic episodes of thermal or load stressing showed no systematic weakening of the material on the scale of our experiments. Most importantly, we show the extremely heterogeneous nature of volcanic edifices that arise from differences in porosity and permeability of the local lithologies, the limited lateral extent of lava flows, and the scars of previous collapse events. Input of these process-specific rock behaviors into slope stability and deformation models can change the resultant hazard analysis. We anticipate that an increased parameterization of rock properties will improve mitigation power.
The STD experiments in Guatemala from 1946-1948 have earned a place of infamy in the history of medical ethics. But if the Guatemala STD experiments were so "ethically impossible," how did the U.S. government approve their funding? Although much of the literature has targeted the failings of Dr. John Cutler, we focus on the institutional context and research ethos that shaped the outcome of the research. After the end of WWII, Dr. Cassius Van Slyke reconstructed the federal research contracts process into a grant program. The inaugural NIH study section recommended approval of the Guatemala STD experiments at its first meeting. The funding and oversight process of the Guatemala research was marked with serious conflicts of interest and a lack of oversight, and it was this structure, as opposed to merely a maleficent individual, that allowed the Guatemala STD experiments to proceed. We conclude that while current research regulations are designed to prevent the abuses perpetrated on the subjects of the Guatemala STD experiments, it takes a comprehensive understanding of research ethics through professional education to achieve the longstanding ideal of the responsible investigator, and ensure ethical research under any regulatory scheme. 2013 American Society of Law, Medicine & Ethics, Inc.
Magmatic processes produce a rich variety of volcano seismic signals, ranging over several orders of magnitude in frequency and over a wide range of mechanism types. We examined signals from 400 to 10 s period associated with explosive eruptions at Fuego volcano, Guatemala, that were recorded over 19 days in 2009 on broadband stations with 30 s and 60 s corner periods. The raw data from the closest stations include tilt effects on the horizontal components but also have significant signal at periods below the instrument corners on the vertical components, where tilt effects should be negligible. We address the problems of tilt-affected horizontal waveforms through a joint waveform inversion of translation and rotation, which allows for an investigation of the varying influence of tilt with period. Using a phase-weighted stack of six similar events, we invert for source moment tensor using multiple bands. We use a grid search for source type and constrained inversions, which provides a quantitative measure of source mechanism reliability. The 30-10 s band-pass results are consistent with previous work that modeled data with a combined two crack or crack and pipe model. At the longest-period band examined, 400-60 s, the source mechanism is like a pipe that could represent the shallowest portion of the conduit. On the other hand, source mechanisms in some bands are unconstrained, presumably due to the combined tilt-dominated and translation-dominated signals, which are not coincident in space and have different time spans.
Guatemala is one of the most seismically active countries in Central America.The largest earthquakes are produced by along the subduction zone of the Cocos and Caribbean plates in the Middle America Trench in the Pacific Ocean. Large earthquakes are also triggered along the boundary between the North American and the Caribbean plates, defined by a zone of large left lateral strike-slip faults that run through Guatemala from the Swan Fracture Zone in the Caribbean Sea. The earthquakes generated along these transcurrent faults, although less frequent, have a great importance to seismic hazard in Central America, more than the subduction-related earthquakes, because of their shallow ipocenters and the proximity of many cities and villages to these active structures. The most destructive event in this region was the earthquake occurred on 4, February 1976 in Guatemala, associated with the Motagua fault, causing 23 000 deaths, and 77 200 injuries. This study attempts at reconstructing the coseismic effects on the environment, to better assess the intensities according to the ESI scale 2007. For the Guatemala 1976 earthquake (M=7,5), the original scientific seismic, geological and macroseismic reports have been reviewed in order to highlight effects on natural environment. The maximum estimated intensity was IX MM in Gualan, in the Mixco area and in the centre of Guatemala City. Intensities value were underestimated despite there was a high level of damages, in fact several towns and villages were totally destroyed and although the earthquake triggered very large and spectacular primary and secondary ground effects. On the basis of all the gathered information has been possible to detect and to localize coseismic environmental effects, and classify them into six main types: surface faulting, slope movements, ground cracks, ground settlements, hydrological changes and tsunami. Primary effects was identified in the Motagua Valley and the mountainous area W of the valley, a
Guatemala is a multiethnic, multilingual, and multicultural country. We have evaluated 2 different ethnic groups from (1) San Juan Sacatepéquez County (SJSC), a rural population (30% illiterate), with 65% from Kaqchiquel ethnic group; and (2) Zone 5 of Guatemala City (Z5GC), an urban population (6.6% illiterate), with 95.5% mestizos. This study aimed to measure simultaneously the prevalence of rheumatic diseases in these 2 Guatemalan populations, both located in the State of Guatemala. A convenience sample of 4000 inhabitants 15 years and older was selected in each group. The Core Community Oriented Program for Control of Rheumatic Diseases Questionnaire was used in this survey. Phase 1 was for screening (identification of study subjects), phase 2 was for obtaining information from subjects with musculoskeletal complaints, and phase 3 was for rheumatologic diagnostic purposes. Phases 1 and 2 were performed by 6 interviewers. Phase 3 was completed by 4 rheumatologists. In phase I, 8000 subjects were identified in both groups. In phase II, 949 subjects reported musculoskeletal complaints: 371 (39%) in Z5GC and 578 (61%) in SJSC. In phase III, 419 patients were clinically evaluated: 141 (34%) in Z5GC and 278 (66%) in SJSC. The most prevalent musculoskeletal diseases were (1) osteoarthritis, (2) soft tissue rheumatism, (3) rheumatoid arthritis, (4) low back pain, and (5) arthralgias of unknown etiology. Osteoarthritis and soft tissue rheumatism were significantly more common in the rural population. The most prevalent musculoskeletal diseases in Guatemala seem to be similar to those in most previous Community Oriented Program for Control of Rheumatic Diseases studies. Most subjects were still working. Further studies examining medical care received and impact on function can now be of interest.
This image from NASA's Mars Reconnaissance Orbiter (MRO) shows a hill with a central crater. Such features have been interpreted as both mud volcanoes (really a sedimentary structure) and as actual volcanoes (the erupting lava kind). They occur on the floor of Valles Marineris below a closed topographic contour that could have held a lake, and the compaction of wet sediments may have created mud volcanoes. The fracture pattern of the bright flow unit surrounding the hill resembles mud cracks. However, there have also been observations from the CRISM instrument interpreted as high-temperature minerals, suggesting actual volcanism, although not necessarily at this location. Fine layers in the hill are consistent with either volcanism or mud flows. Either way, this activity is relatively recent in geologic time and may mark habitable subsurface environments. 350c69d7ab