Open AccessFrequency structure of deep low‐frequency tremors occurring in western Shikoku region, Japan
Author(s) -
Nakamula Sho,
Takeo Minoru
Publication year - 2010
Publication title -
geophysical journal international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.302
H-Index - 168
eISSN - 1365-246X
pISSN - 0956-540X
DOI - 10.1111/j.1365-246x.2010.04500.x
Subject(s) - low frequency , geology , very low frequency , ultra low frequency , oscillation (cell signaling) , seismology , low frequency oscillation , extremely low frequency , volcano , slow earthquake , geophysics , acoustics , physics , subduction , computer science , telecommunications , interplate earthquake , power (physics) , tectonics , electric power system , quantum mechanics , biology , genetics , electromagnetic field
SUMMARY Since the discovery of deep low‐frequency tremors in southwestern Japan, various types of low‐frequency oscillation phenomena have been reported and analysed. Among these phenomena, non‐volcanic, deep, low‐frequency tremors in southwestern Japan are outstanding low‐frequency oscillation phenomena occurring over a wide region along the Philippine Sea Plate. However, the weakness of these signals makes it difficult to apply usual analyses to derive source characteristics. In this paper, we apply a new algorithm to obtain a frequency structure from highly noisy data and reveal the characteristic frequency structure of deep low‐frequency tremors with peaks lined up from 1 to 5 Hz at intervals of 0.5 Hz. In addition, we present one piece of evidence that the deep low‐frequency tremors and low‐frequency earthquakes have a common source mechanism.