Results 11 to 20 of about 157,284 (285)

Bayesian approach for detecting dynamically triggered very low-frequency earthquakes in the Nankai subduction zone and application to the 2016Mw 5.9 off-Kii Peninsula earthquake, Japan

Geophysical Journal International, 2019
surface and borehole sensors. A maximum-likelihood approach is used to estimate source parameters that best explain the surface observations predicted by the borehole observations and probable VLF signals. We found that six VLF events with magnitudes 3.4
Masatoshi Miyazawa, Miyazawa Masatoshi
exaly   +2 more sources

Possible precursor to the March 11, 2011, Japan earthquake: ionospheric perturbations as seen by subionospheric very low frequency/low frequency propagation

Annals of Geophysics, 2012
<p>This study reports on a possible very low frequency/low frequency (VLF/LF) subionospheric precursor to a recent earthquake in Japan. As the epicenter of this large Japanese earthquake on March 11, 2011, was located just on the great-circle path ...
Jun Izutsu, Hiroki Yamaguchi, Kenji Ohta, Yoshihiro Yasuda, Yasuhide Hobara, Masashi Hayakawa, Tohru Nakamura   +6 more
doaj   +2 more sources

The very low-frequency transmitter radio wave anomalies related to the 2010 Ms 7.1 Yushu earthquake observed by the DEMETER satellite and the possible mechanism [PDF]

Annales Geophysicae, 2020
Earthquakes may disturb the lower ionosphere through various coupling mechanisms during the seismogenic and coseismic periods. The VLF (very low-frequency) signal radiated from ground-based transmitters will be affected when it penetrates the disturbed ...
S. Zhao, X. Shen, Z. Zhima, C. Zhou
doaj   +2 more sources

Detectability analysis of very low frequency earthquakes: Methods and application in Nankai using F-net and DONET broadband seismometers

Geophysical Journal International, 2022
Abstract For a more quantitative discussion of slow earthquake activity, we evaluated the detectable limits of very low frequency earthquakes (VLFEs), which are seismic slow earthquakes observed in very low frequency (< 0.05 Hz) bands in the Nankai subduction zone.
Shunsuke Takemura, Satoru Baba, Suguru Yabe, Yusuke Yamashita, Katsuhiko Shiomi, Takanori Matsuzawa   +5 more
openaire   +2 more sources

Source duration of deep very low frequency earthquakes in western Shikoku, Japan [PDF]

Journal of Geophysical Research, 2009
The source durations of very low frequency earthquakes in western Shikoku, Japan were estimated. Nineteen very low frequency earthquakes were located in this region between 14 and 17 March 2007 that migrated southward with tremor activity. The source durations of four Mw 3.5–3.8 very low frequency earthquakes were estimated by comparing simulated and ...
Takuto Maeda, Takanori Matsuzawa, Kazushige Obara   +2 more
exaly   +2 more sources

Spatiotemporal distribution and seismic interaction of very-low-frequency earthquakes in the northern Ryukyu Trench

Earth, Planets and Space
Slow earthquakes play a crucial role in understanding stress accumulation and release along plate interfaces in subduction zones. The northern Ryukyu Trench, where the Philippine Sea Plate subducts northwestward beneath the Eurasian Plate, experienced a ...
Mamoru Nakamura, Ban-Yuan Kuo, Pei-Ying Patty Lin, Shuichi Kodaira, Yasushi Ishihara   +4 more
doaj   +2 more sources

Spatiotemporal variability and tectonic implications of very low-frequency earthquakes in the southwestern Ryukyu Trench

Earth, Planets and Space
This study focuses on very low-frequency earthquakes (VLFEs) occurring in the southwestern Ryukyu Trench and investigates their long-term activity as well as their relationship with regional seismicity and tectonic features.
Mamoru Nakamura, Ren Yakabu
doaj   +3 more sources

Sub-ionospheric very low frequency perturbations associated with the 12 May 2008 M = 7.9 Wenchuan earthquake

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. 25.41° N, long 81.93° E), due to Wenchuan earthquake (EQ) that occurred on 12 May 2008 with the magnitude 7.9 and at the depth of 19 km in Sichuan ...
A. K. Maurya, R. Singh, B. Veenadhari, S. Kumar, A. K. Singh   +4 more
openaire   +4 more sources

Décollement geometry controls on shallow very low frequency earthquakes [PDF]

Scientific Reports, 2022
AbstractRecent studies have documented the occurrence of shallow very low frequency earthquakes (VLFE) in subduction zones. The heterogeneity of the materials or stresses that act on the plate interface results in the variable slip rate. Stress on the décollement can be controlled by the décollement geometry and the regional stress, which is also able ...
Yoshitaka Hashimoto, Shigeyuki Sato, Gaku Kimura, Masataka Kinoshita, Ayumu Miyakawa, Gregory F. Moore, Masaru Nakano, Kazuya Shiraishi, Yasuhiro Yamada   +8 more
openaire   +3 more sources

An 8‐Year‐Long Low‐Frequency Earthquake Catalog for Southern Cascadia [PDF]

Journal of Geophysical Research - Solid Earth, 2022
Low‐frequency earthquakes (LFEs) are small magnitude earthquakes with typical magnitude less than 2 and reduced amplitudes at frequencies greater than 10 Hz relative to ordinary small earthquakes. Their occurrence is often associated with tectonic tremor
A. Ducellier, K. Creager
semanticscholar   +1 more source