Monitoring of ULF (ultra-low-frequency) Geomagnetic Variations Associated with Earthquakes

ULF wave occurrence statistics in a high-latitude HF Doppler sounder

Ultra low frequency (ULF) wave activity in the high-latitude ionosphere has been observed by a high frequency (HF) Doppler sounder located at Tromsù, Norway (69.7°N, 19.2°E geographic coordinates). A statistical study of the occurrence of these waves has been undertaken from data collected between 1979 and 1984. The diurnal, seasonal, solar cycle and geomagnetic activity variations in occurrenc...

Identification of Sources of Geomagnetic Variations Using Detrended Fluctuation Analysis (DFA)

This report is an attempt to use Detrended Fluctuation Analysis (DFA) to relate scaling properties of ground-based ULF magnetic field data to occurrence of earthquakes. The magnetic field data are from the South European Geo-magnetic Array (SEGMA) (Vellante et al., 2002). Several moderate earthquakes (4.3 < M < 5.5) occurred in the Adriatic region during November-December 2004. Thus a seven mon...

Global ultra-Low-Frequency Geomagnetic Pulsations Associated with the March 24, 1991 Geomagnetic Storm

On 24 March 1991, global ultra-low-frequency (ULF) pulsations (1.1 3.3 mHz) observed in the magnetosphere as well as on the ground were studied via analyzing magnetic field data obtained from a global network, comprising ground-based observatories and geosynchronous satellites. In the magnetosphere, the compressional and transverse components of the magnetic fields recorded at two satellites, G...

A Transportable System for Monitoring Ultra Low Frequency Electromagnetic Signals Associated with Earthquakes

ULF Geomagnetic Changes Associated with Large Earthquakes

329 1 Marine Biosystems Research Center, Chiba University, Inage, Chiba, Japan *Corresponding author address: Prof. Katsumi Hattori, Marine Biosystems Research Center, Chiba University, Inage, Chiba, Japan; E-mail: [email protected] Despite its extreme importance and years of effort, practical short-term earthquake prediction still remains to be seen. However, research in earthquake...