50 research outputs found
IAGA: a major role in understanding our magnetic planet
Throughout the International Union of
Geodesy and Geophysics's (IUGG's) centennial anniversary, the International
Association of Geomagnetism and Aeronomy is holding a series of activities to
underline the ground-breaking facts in the area of geomagnetism and aeronomy.
Over 100 years, the history of these research fields is rich, and here we
present a short tour through some of the International Association of
Geomagnetism and Aeronomy's (IAGA's) major achievements. Starting with the
scientific landscape before IAGA, through its foundation until the present,
we review the research and achievements considering its complexity and
variability, from geodynamo up to the Sun and outer space. While a number of
the achievements were accomplished with direct IAGA involvement, the others
represent the most important benchmarks of geomagnetism and aeronomy studies.
In summary, IAGA is an important and active association with a long and rich
history and prospective future.</p
Variability of the Lipid Peroxidation Potential in the Erythrocytes of the Domestic Fowl
Geostatistical Microscale Study of Magnetic Susceptibility in Soil Profile and Magnetic Indicators of Potential Soil Pollution
Magma plumbing systems: a geophysical perspective
Over the last few decades, significant advances in using geophysical techniques to image the structure of magma plumbing systems have enabled the identification of zones of melt accumulation, crystal mush development, and magma migration. Combining advanced geophysical observations with petrological and geochemical data has arguably revolutionised our understanding of, and afforded exciting new insights into, the development of entire magma plumbing systems. However, divisions between the scales and physical settings over which these geophysical, petrological, and geochemical methods are applied still remain. To characterise some of these differences and promote the benefits of further integration between these methodologies, we provide a review of geophysical techniques and discuss how they can be utilised to provide a structural context for and place physical limits on the chemical evolution of magma plumbing systems. For example, we examine how Interferometric Synthetic Aperture Radar (InSAR), coupled with Global Positioning System (GPS) and Global Navigation Satellite System (GNSS) data, and seismicity may be used to track magma migration in near real-time. We also discuss how seismic imaging, gravimetry and electromagnetic data can identify contemporary melt zones, magma reservoirs and/or crystal mushes. These techniques complement seismic reflection data and rock magnetic analyses that delimit the structure and emplacement of ancient magma plumbing systems. For each of these techniques, with the addition of full-waveform inversion (FWI), the use of Unmanned Aerial Vehicles (UAVs) and the integration of geophysics with numerical modelling, we discuss potential future directions. We show that approaching problems concerning magma plumbing systems from an integrated petrological, geochemical, and geophysical perspective will undoubtedly yield important scientific advances, providing exciting future opportunities for the volcanological community