Video Experimental Relacionado
Updated: Jul 6, 2026
07:58
Data Processing Methods for 3D Seismic Imaging of Subsurface Volcanoes: Applications to the Tarim Flood Basalt
Published on: August 7, 2017
Predicción de erupciones en el Monte St. Helens, de junio de 1980 a diciembre de 1982
Science (New York, N.Y.)
|September 30, 1983
Resumen
Las erupciones del Monte St. Helens se predijeron con horas o semanas de antelación utilizando la sismicidad y la deformación del suelo. Esta capacidad de predicción de erupciones volcánicas mejoró la seguridad y la planificación informada del uso de la tierra.
Área de la Ciencia:
- Geología Geología Geología.
- Volcanología Volcanología.
- Sismología Sismología Sismología.
Sus antecedentes:
- El Monte St. Helens experimentó numerosas erupciones entre 1980 y 1982.
- La predicción de la actividad volcánica es crucial para la seguridad pública y la gestión de los recursos.
Objetivo del estudio:
- Para analizar la efectividad de los métodos de predicción de las erupciones del Monte Santa Elena.
- Para evaluar el tiempo de espera y los precursores asociados con los eventos volcánicos.
Principales métodos:
- Monitoreo de la sismicidad precursora (actividad sísmica).
- Seguimiento de la deformación del suelo del cráter y la cúpula de lava.
- Analizando las emisiones de gases.
Principales resultados:
- Se predijeron trece erupciones entre 1980 y 1982.
- Las predicciones iniciales fueron con horas de anticipación; las predicciones posteriores oscilaron entre 3 días y 3 semanas.
- La sismicidad, la deformación de la cúpula y las emisiones de gases fueron indicadores clave.
Conclusiones:
- La predicción de erupciones volcánicas es factible utilizando múltiples técnicas de monitoreo.
- Las capacidades de predicción mejoradas reducen significativamente los riesgos para la vida y la propiedad.
- Los datos de predicción pueden guiar la planificación del uso del suelo en áreas volcánicas peligrosas.
Videos de Conceptos Relacionados
01:50Global Climate Change
Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.
00:52Washing, Drying, and Ignition of Precipitates
After filtration, the precipitate is washed to remove coprecipitated impurities and any remaining mother liquor. Colloidal precipitates, such as silver chloride, are washed with an electrolyte (such as dilute nitric acid) to prevent the peptization of the precipitate. In the case of slightly soluble precipitates, the wash solution contains a common ion to reduce solubility. Lead sulfate, which is slightly soluble in water, is washed with dilute sulfuric acid. Similarly, wash solutions may be...
01:17Precipitation and Co-precipitation
Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
01:22Atomic Emission Spectroscopy: Instrumentation
The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers. Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.
01:30Atomic Emission Spectroscopy: Interference
In atomic emission spectroscopy (AES), high-temperature atomizers excite a broad range of elements and molecules that generate complex emissions from sources such as oxides, hydroxides, and flame combustion products in the flame or plasma. Several strategies can be employed to minimize spectral interferences caused by overlapping emission lines or bands. These include increasing instrument resolution, choosing alternative emission lines, optimally placing the detector in low-background regions,...
01:21Masonry in Cold and Hot Weather Conditions
In cold weather, masonry construction requires specific precautions to ensure mortar does not freeze before curing, as this can significantly weaken its strength and watertightness. Mortar temperature should be maintained between 60°F and 80°F to support proper hydration and curing. Below 40°F, mortar water must be heated, but should not exceed 120°F as high temperatures can reduce mortar's compressive and bond strength.
Other key practices include keeping masonry units and sand dry and...
Other key practices include keeping masonry units and sand dry and...