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Study on Relationship between Very Low-Frequency Earthquake and Non-Volcanic Tremor in the Nankai Subduction Zoneopenaire
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Indian Journal of Physics, 2014
We present evidence of unusual Very Low Frequency (VLF) signal amplitude variation during the devastating earthquake of magnitude 9.0 which occurred at Honshu, in Japan on 11 March, 2011. We use the SoftPAL very low frequency receiver placed at Ionospheric and Earthquake Research Centre of Indian Centre for Space Physics, located at Sitapur (Lat. 22°30′
Sandip Kumar Chakrabarti +2 more
exaly +4 more sources
We present evidence of unusual Very Low Frequency (VLF) signal amplitude variation during the devastating earthquake of magnitude 9.0 which occurred at Honshu, in Japan on 11 March, 2011. We use the SoftPAL very low frequency receiver placed at Ionospheric and Earthquake Research Centre of Indian Centre for Space Physics, located at Sitapur (Lat. 22°30′
Sandip Kumar Chakrabarti +2 more
exaly +4 more sources
Journal of Geophysical Research: Solid Earth, 2020
AbstractVery low frequency earthquakes (VLFEs), classified as one type of slow earthquake, occur near seismogenic zones and can be a proxy for interplate slow slip. We investigated VLFE activity off the Hokkaido and Tohoku Pacific coasts, where the Pacific plate subducts under the North American plate.
Akiko Takeo +2 more
exaly +3 more sources
AbstractVery low frequency earthquakes (VLFEs), classified as one type of slow earthquake, occur near seismogenic zones and can be a proxy for interplate slow slip. We investigated VLFE activity off the Hokkaido and Tohoku Pacific coasts, where the Pacific plate subducts under the North American plate.
Akiko Takeo +2 more
exaly +3 more sources
Physics of the Earth and Planetary Interiors, 1989
Abstract An anomalous increase in the intensity of low-frequency (0.1–16 kHz) radiowave emissions was detected using Intercosmos 19 data when the satellite was nearly over the epicentre of an earthquake zone. Ample statistical data are the basis for a determination of the probable spatial-temporal dimensions of the region of the upper ionosphere in ...
V.I. Larkina +5 more
openaire +2 more sources
Abstract An anomalous increase in the intensity of low-frequency (0.1–16 kHz) radiowave emissions was detected using Intercosmos 19 data when the satellite was nearly over the epicentre of an earthquake zone. Ample statistical data are the basis for a determination of the probable spatial-temporal dimensions of the region of the upper ionosphere in ...
V.I. Larkina +5 more
openaire +2 more sources
Tidal sensitivity of shallow very low frequency earthquakes in the Ryukyu Trench
Journal of Geophysical Research: Solid Earth, 2017AbstractWe show that the activity between 2002 and 2014 of shallow very low frequency earthquakes (VLFEs), which occur in shallow subduction zones of the Ryukyu Trench, responds to ocean and Earth tides. Tidal sensitivity is highest in the central portion of the Ryukyu Trench and lowest in the southwest. The lag of peak VLFE activation behind the peaks
Mamoru Nakamura, Keito Kakazu
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Studies of precursors of earthquakes using anomalies in very low frequency signal
2014 XXXIth URSI General Assembly and Scientific Symposium (URSI GASS), 2014It is long conjectured that the ionosphere is affected by seismic activities and these effects can be detected in VLF signals. We present long term statistical studies for a quiet solar condition of three types of anomalies in the VLF signal amplitude and observed significant precursory effects in 1–5 days before major earthquakes.
Sudipta Sasmal +2 more
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Very Low-Frequency Earthquakes and Earthquake Swarms in the Northern Ryukyu Trench
Slow earthquakes, distinct from regular earthquakes in their gradual release of seismic energy, play a key role in stress accumulation and release at subduction plate interfaces and have been proposed as potential precursors to large earthquakes. In the northern Ryukyu Trench, the Philippine Sea Plate subducts beneath the Eurasian Plate, and the regionMamoru Nakamura +4 more
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Geophysical Research Letters, 2019
The spatiotemporal characteristics of shallow slow earthquake activity are linked to the tectonic environments of shallow plate boundaries. In this work, the spatiotemporal variations of shallow very low frequency earthquake (SVLFE) activity along the ...
S. Takemura +5 more
semanticscholar +1 more source
The spatiotemporal characteristics of shallow slow earthquake activity are linked to the tectonic environments of shallow plate boundaries. In this work, the spatiotemporal variations of shallow very low frequency earthquake (SVLFE) activity along the ...
S. Takemura +5 more
semanticscholar +1 more source
Earth and Planetary Science Letters, 2018
Abstract We investigated the distribution of very low frequency earthquakes (VLFEs) that occurred in the shallow accretionary prism of the eastern Nankai trough during one week of VLFE activity in October 2015. They were recorded very close from the sources by an array of broadband ocean bottom seismometers (BBOBSs) equipped in Dense Oceanfloor ...
Akiko Toh +2 more
openaire +1 more source
Abstract We investigated the distribution of very low frequency earthquakes (VLFEs) that occurred in the shallow accretionary prism of the eastern Nankai trough during one week of VLFE activity in October 2015. They were recorded very close from the sources by an array of broadband ocean bottom seismometers (BBOBSs) equipped in Dense Oceanfloor ...
Akiko Toh +2 more
openaire +1 more source