Journal of geomagnetism and geoelectricity · 1990 · 21 citations · 7 references
Natural SciencesEarth SciencesGeophysicsGeomagnetismSeismologyVolcanologyGeomagnetic Field SourcesMagnetic AnomaliesVolcanic EruptionsGas ExplosionGeomagnetic Field MeasurementsGeomagnetic IntensityMagnetic Field VariabilityMagnetic Source Depth EstimationMagnetic Source LocalizationMagnetometersVolcanic Magnetic Anomalies
After the 1986 eruption of Izu-Oshima Volcano, proton magnetometers were installed at various sites in the island. Most of the sites started measurements by March, 1987. During the period from March to November 15, the day before the 1987 gas explosion of the volcano, large magnetic variations in total intensity were observed at the sites located on the caldera floor. The variations can be divided into three stages, March-June, July-August, and September-November. The first stage
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