Results 21 to 30 of about 157,284 (285)
EARTHQUAKE PREDICTION EVALUATION BASED ON VLF DATA USING A NOVEL INTERSECTION-UNION METHOD [PDF]
ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2021 Electromagnetic phenomena, especially those in the Very Low Frequency/Low Frequency (VLF/LF) bands are promising for short-term earthquake prediction. Seismo-ionospheric perturbations cause a variety of changes in different receiver-transmitter VLF/LF ...
W. Barghi +5 more
doaj +1 more source
Journal of Geophysical Research: Solid Earth, 2021 Cross‐correlation analysis was applied to long‐term onshore broadband records from April 2004 to March 2021 to detect and relocate shallow very low frequency earthquakes (VLFEs) southeast off the Kii Peninsula, along the Nankai Trough, Japan.
S. Takemura +3 more
semanticscholar +1 more source
Dizhen xuebao, 2021 甚低频/低频人工源电波作为一种主动源发射的通讯导航信号，因其长距离波导传播的特性在地-电离层观测及应用中表现出极大的优势。本文总结了二十世纪末以来基于甚低频/低频（VLF/LF）电波观测技术及其数据分析方法、典型震例及统计研究成果、圈层耦合机理等方面的研究进展，并通过探讨其应用成果的快速积累及前兆扰动起源等研究难点，展望了未来在我国多种地基和卫星电磁配合下的综合立体体系建设以及该技术可能发挥的最大贡献。
Xuemin Zhang
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Very low frequency earthquakes in Cascadia migrate with tremor [PDF]
Geophysical Research Letters, 2015 AbstractWe find very low frequency earthquakes (VLFEs) in Cascadia under northern Washington during 2011 episodic tremor and slip event. VLFEs are rich in low‐frequency energy (20–50 s) and depleted in higher frequencies (higher than 1 Hz) compared to local earthquakes.
Ghosh, Abhijit +3 more
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Universality of slow earthquakes in the very low frequency band [PDF]
Geophysical Research Letters, 2014 AbstractDeep tectonic tremors have been observed together with signals in the very low frequency (VLF) band from 0.02 to 0.05 Hz, which have been identified as VLF events in limited regions of subduction zones. By stacking broadband seismograms relative to the timing of tremors, we have detected similar signals in all regions where tremors occur in ...
Satoshi Ide, Suguru Yabe
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Very low frequency earthquakes along the Ryukyu subduction zone [PDF]
Geophysical Research Letters, 2012 A total of 1314 very low frequency earthquakes (VLFEs) were identified along the Ryukyu trench from seismograms recorded at broadband networks in Japan (F‐net) and Taiwan (BATS) in 2007. The spectra of typical VLFEs have peak frequencies between 0.02 to 0.1 Hz. Among those, waveforms from 120 VLFEs were inverted to obtain their centoroid moment tensor (
Masataka Ando +4 more
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A review on slow earthquakes in the Japan Trench
Progress in Earth and Planetary Science, 2023 Slow earthquakes are episodic slow fault slips. They form a fundamental component of interplate deformation processes, along with fast, regular earthquakes.
Tomoaki Nishikawa +2 more
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Dynamic deformation of the accretionary prism excites very low frequency earthquakes [PDF]
Geophysical Research Letters, 2006 We have detected anomalous very‐low‐frequency earthquakes within the accretionary prism along the Nankai Trough, southwestern Japan. Centroid moment tensor inversion analysis reveals that the earthquake hypocenters are distributed at ∼10 km depth above the upper surface of the subducting Philippine Sea Plate, and within 50–70 km landward of the trough ...
Yoshihiro Ito, Kazushige Obara
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Sub-ionospheric very low frequency perturbations associated with the 12 May 2008 M = 7.9 Wenchuan earthquake [PDF]
Natural Hazards and Earth System Sciences, 2013 The present study reports the VLF (very low frequency) sub-ionospheric perturbations observed on transmitter JJI (22.1 kHz), Japan, received at the Indian low-latitude station, Allahabad ( geographic lat.
A. K. Maurya +4 more
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Widespread Very Low Frequency Earthquakes (VLFEs) Activity Offshore Cascadia
Geophysical Research Letters, 2022 AbstractA significant amount of stress in the Cascadia subduction zone (CSZ) is released by different forms of slow earthquakes including tremors, low‐frequency earthquakes, and very low‐frequency earthquakes (VLFEs)—all occurring onshore at the deeper part of the transition zone. Their activity offshore, however, remains elusive.
Kuntal Chaudhuri, Abhijit Ghosh
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