Chie Yoshino

TL;DR: In this article, the authors investigated the energy of ULF geomagnetic signals of the frequency around 001 Hz using wavelet transform analysis to minimize the influences of artificial noises and global geOMagnetic perturbations.

TL;DR: In this article, the spectral density ratio between the horizontal and vertical components (polarization) exhibits an anomalous behavior two weeks before the earthquake, which suggests that this anomalous change might be a possible signal associated with the earthquake preparation phase.

TL;DR: In this article, the authors analyzed geomagnetic data observed during the past decade in Izu and Boso Peninsulas in Kanto, Japan and found that there are higher probabilities of ULF anomalies before a sizeable earthquake than after the earthquake.

TL;DR: In this article, the singular spectral analysis (SSA) and the principal component analysis (PCA) have been applied to the time series data sets filtered at 0.01 Hz of NS component at three stations.

TL;DR: In this paper, a new method of principal component analysis (PCA) has been applied to the ULF geomagnetic data associated with 2000 Izu Islands earthquake swarm, and the results are summarized as follows.