ULF Geomagnetic Changes Associated with Large Earthquakes

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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...

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

ULF (ultra-low-frequency) electromagnetic emission is recently recognized as one of the most promising candidates for short-term earthquake prediction. This paper reviews previous convincing evidence on the presence of ULF emissions before a few large earthquakes. Then, we present our network of ULF monitoring in the Tokyo area by describing our ULF magnetic sensors and we finally present a few...

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Principal component analysis and singular spectrum analysis of ULF geomagnetic data associated with earthquakes

In order to extract any ULF signature associated with earthquakes, the principal component analysis (PCA) and singular spectral analysis (SSA) have been performed to investigate the possibility of discrimination of signals from different sources (geomagnetic variation, artificial noise, and the other sources (earthquake-related ULF emissions)). We adopt PCA to the time series data observed at c...

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Ulf Geomagneic Changes Associated with Crustal Activitity

Despite its extreme importance and years of effort, practical short-term earthquake prediction still remains to be achieved in future. However, earthquakerelated electromagnetic phenomena are recently considered as a promising candidate for short-term earthquake prediction. There have been accumulated a lot of evidences of precursory signatures in a wide frequency range (DC-VHF). The ULF geomag...

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Variations of phase velocity and gradient values of ULF geomagnetic disturbances connected with the Izu strong earthquakes

Results of study of anomaly behavior of amplitudes, phase velocities and gradients of ULF electromagnetic disturbances (F = 0.002 – 0.5 Hz) before and during a seismic active period are presented. Investigations were carried out in Japan (Izu and Chiba peninsulas) by two groups of magnetic stations spaced apart at a distance ∼140 km. Every group (magnetic gradientometer) consists of three 3comp...

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ژورنال

عنوان ژورنال: Terrestrial, Atmospheric and Oceanic Sciences

سال: 2004

ISSN: 1017-0839

DOI: 10.3319/tao.2004.15.3.329(ep)