Wavelet transform as a tool for detection of geomagnetic precursors of earthquakes

Autor:	V. Zheludev, L.S. Alperovich
Rok vydání:	1998
Předmět:	Earth's magnetic field Digital network Wavelet approach Range (statistics) General Earth and Planetary Sciences Wavelet transform Discrete wavelet analysis Geophysics Seismology Ultra low frequency Geology Physics::Geophysics
Zdroj:	Physics and Chemistry of the Earth. 23:965-967
ISSN:	0079-1946
DOI:	10.1016/s0079-1946(98)00128-1
Popis:	We applied discrete wavelet analysis to US geomagnetic digital network data to reveal ultra low frequency (ULF) waves prior to the occurrence of strong earthquake, such as M=7.0 Loma-Prieta, California earthquake. Via the wavelet approach we succeeded in discovering the following phenomena: 1. Geomagnetic oscillations of specific scale time within the range 10 min - a few hours were generated in the seismoactive region 2 days and 5 hours before the Loma-Prieta earthquake. 2. The oscillations were running from the source in the two modes: as a result of earth currents extending from a seismic source (hourly oscillations) and as slow hydromagnetic waves (short packets of 3 ÷ 10min oscillations).
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::982a38135d5fe0e416f1aa6feae58409 https://doi.org/10.1016/s0079-1946(98)00128-1 Zobrazit plný text záznamu Full Text from ScienceDirect