Magnetic and electric field observations during the 2000 activity of Miyake-jima volcano, Central Japan

Multifractality in local geomagnetic field at Etna volcano, Sicily (southern Italy)

“…In particular the sequence of eruptive events shows time-scaling over a relatively wide range of timescales, pointing to the presence of correlated structures in the point process, which models the sequence of eruptions (Telesca et al, 2002). Also the seismicity of Mt.…”

“…Mid-term trend signals (weeks to months), with amplitude of about few nanoteslas, include near-surface thermal demagnetization effects, stress field induced changes, and effects from rotation/displacement of magnetized material (Zlotnicki et al, 1993). Short-term variations (seconds to days) could result from instantaneous variations of rocks magnetization induced by local stress redistribution and from fluid flow current through fissures within the volcanic edifice accompanying fault ruptures and fracture opening (Mueller and Johnston, 1998;Sasai et al, 2002). Thus, the characterization of the volcanomagnetic signals, which seem to depend on the structural heterogeneity and the dynamics of the plumbing system of each volcanic edifice, can be a useful instrument both for improving the monitoring of active volcanoes as well as developing a greater understanding of the preeruptive mechanisms which produce them.…”

Magnetic and electric field monitoring of Taal volcano, Philippines Part I: Magnetic measurements

“…3), 4) The monitoring network of the volcanic activity in the Philippines has been maintained by the Philippine Institute of Volcanology and Seismology (PHIVOLCS). Their network consists of seismometer, GPS receiver, water level data logger, tide gauges, electro-optical distance measurement, and precise leveling.…”

Electric Field of the Ocean Induced by Diffusion

“…Geological and geochemical processes may cause thermal and concentration anomalies, which give anomalies in the electric field. For example, magnetic and electric field variations associated with eruption of volcano where observed and summarized elsewhere [24]. In coastal area incursion of seawater into fresh-water aquifers may to create strong concentration gradients, which induce anomaly of electric field [25].…”