The Ionospheric Precursor to the 2011 March 11 Earthquake Based upon Observations Obtained from the Japan-Pacific Subionospheric VLF/LF Network
By using network observation of subionospheric VLF (very low frequency)/LF (low frequency) signals in Japan and in Russia, we have found a significant ionospheric perturbation prior to the recent 2011 March 11 Japan earthquake (EQ) which occurred at sea proximate to the Tohoku area on the main islan...
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ftdoajarticles:oai:doaj.org/article:fe1c5da67ac54c1bad78db9fd2da2194 2023-05-15T16:59:26+02:00 The Ionospheric Precursor to the 2011 March 11 Earthquake Based upon Observations Obtained from the Japan-Pacific Subionospheric VLF/LF Network Masashi Hayakawa Yasuhide Hobara Alexander Rozhnoi Maria Solovieva Kenji Ohta Jun Izutsu Tohru Nakamura Yasushi Kasahara 2013-01-01T00:00:00Z https://doaj.org/article/fe1c5da67ac54c1bad78db9fd2da2194 EN eng Springer http://tao.cgu.org.tw/images/attachments/v243p393.pdf https://doaj.org/toc/1017-0839 https://doaj.org/toc/2311-7680 1017-0839 2311-7680 10.3319/TAO.2012.12.14.01(AA) https://doaj.org/article/fe1c5da67ac54c1bad78db9fd2da2194 Terrestrial, Atmospheric and Oceanic Sciences, Vol 24, Iss 3, p 393 (2013) Ionospheric precursor VLF/LF subionospheric propagation 2011 March 11 Japan earthquake Geology QE1-996.5 Geophysics. Cosmic physics QC801-809 article 2013 ftdoajarticles 2022-12-31T02:14:19Z By using network observation of subionospheric VLF (very low frequency)/LF (low frequency) signals in Japan and in Russia, we have found a significant ionospheric perturbation prior to the recent 2011 March 11 Japan earthquake (EQ) which occurred at sea proximate to the Tohoku area on the main island (Honshu) of Japan was an exceptionally huge plate-type EQ. A remarkable anomaly (with a decrease in the nighttime amplitude and also with enhancement in dispersion) was detected on March 5 and 6 along the propagation path from the NLK (Seattle, USA) transmitter to Chofu (together with Kochi and Kasugai). We also have observed the corresponding VLF anomaly during a prolonged period of March 1 - 6, with minima in the nighttime amplitude on March 3 and 4 along the path from JJI (Miyazaki, Kyushu) to Kamchatka, Russia. This ionospheric perturbation has been discussed extensively with respect to its reliability. (1) How abnormal is this VLF/LF propagation anomaly? (2) What was the temporal evolution of terminator times? (3) Were there any solar-terrestrial effects (especially the effect from geomagnetic storms) on the VLF/LF propagation anomaly? (4) The effect of any other EQs and foreshock activities on the VLF/LF anomaly? (5) Were there any correlations with other related phenomena? Finally, (6) are there any other examples of a VLF/LF propagation anomaly for oceanic EQs? We then compared the temporal properties of ionospheric perturbations for this EQ with those of a huge number of inland EQs and compared the corresponding spatial scale with the former result of the same oceanic 2004 Sumatra EQ with nearly the same magnitude. Finally, the generation mechanism of those seismo-ionospheric perturbations is briefly discussed. Article in Journal/Newspaper Kamchatka Directory of Open Access Journals: DOAJ Articles Main Island ENVELOPE(-38.220,-38.220,-54.007,-54.007) Pacific |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Ionospheric precursor VLF/LF subionospheric propagation 2011 March 11 Japan earthquake Geology QE1-996.5 Geophysics. Cosmic physics QC801-809 |
spellingShingle |
Ionospheric precursor VLF/LF subionospheric propagation 2011 March 11 Japan earthquake Geology QE1-996.5 Geophysics. Cosmic physics QC801-809 Masashi Hayakawa Yasuhide Hobara Alexander Rozhnoi Maria Solovieva Kenji Ohta Jun Izutsu Tohru Nakamura Yasushi Kasahara The Ionospheric Precursor to the 2011 March 11 Earthquake Based upon Observations Obtained from the Japan-Pacific Subionospheric VLF/LF Network |
topic_facet |
Ionospheric precursor VLF/LF subionospheric propagation 2011 March 11 Japan earthquake Geology QE1-996.5 Geophysics. Cosmic physics QC801-809 |
description |
By using network observation of subionospheric VLF (very low frequency)/LF (low frequency) signals in Japan and in Russia, we have found a significant ionospheric perturbation prior to the recent 2011 March 11 Japan earthquake (EQ) which occurred at sea proximate to the Tohoku area on the main island (Honshu) of Japan was an exceptionally huge plate-type EQ. A remarkable anomaly (with a decrease in the nighttime amplitude and also with enhancement in dispersion) was detected on March 5 and 6 along the propagation path from the NLK (Seattle, USA) transmitter to Chofu (together with Kochi and Kasugai). We also have observed the corresponding VLF anomaly during a prolonged period of March 1 - 6, with minima in the nighttime amplitude on March 3 and 4 along the path from JJI (Miyazaki, Kyushu) to Kamchatka, Russia. This ionospheric perturbation has been discussed extensively with respect to its reliability. (1) How abnormal is this VLF/LF propagation anomaly? (2) What was the temporal evolution of terminator times? (3) Were there any solar-terrestrial effects (especially the effect from geomagnetic storms) on the VLF/LF propagation anomaly? (4) The effect of any other EQs and foreshock activities on the VLF/LF anomaly? (5) Were there any correlations with other related phenomena? Finally, (6) are there any other examples of a VLF/LF propagation anomaly for oceanic EQs? We then compared the temporal properties of ionospheric perturbations for this EQ with those of a huge number of inland EQs and compared the corresponding spatial scale with the former result of the same oceanic 2004 Sumatra EQ with nearly the same magnitude. Finally, the generation mechanism of those seismo-ionospheric perturbations is briefly discussed. |
format |
Article in Journal/Newspaper |
author |
Masashi Hayakawa Yasuhide Hobara Alexander Rozhnoi Maria Solovieva Kenji Ohta Jun Izutsu Tohru Nakamura Yasushi Kasahara |
author_facet |
Masashi Hayakawa Yasuhide Hobara Alexander Rozhnoi Maria Solovieva Kenji Ohta Jun Izutsu Tohru Nakamura Yasushi Kasahara |
author_sort |
Masashi Hayakawa |
title |
The Ionospheric Precursor to the 2011 March 11 Earthquake Based upon Observations Obtained from the Japan-Pacific Subionospheric VLF/LF Network |
title_short |
The Ionospheric Precursor to the 2011 March 11 Earthquake Based upon Observations Obtained from the Japan-Pacific Subionospheric VLF/LF Network |
title_full |
The Ionospheric Precursor to the 2011 March 11 Earthquake Based upon Observations Obtained from the Japan-Pacific Subionospheric VLF/LF Network |
title_fullStr |
The Ionospheric Precursor to the 2011 March 11 Earthquake Based upon Observations Obtained from the Japan-Pacific Subionospheric VLF/LF Network |
title_full_unstemmed |
The Ionospheric Precursor to the 2011 March 11 Earthquake Based upon Observations Obtained from the Japan-Pacific Subionospheric VLF/LF Network |
title_sort |
ionospheric precursor to the 2011 march 11 earthquake based upon observations obtained from the japan-pacific subionospheric vlf/lf network |
publisher |
Springer |
publishDate |
2013 |
url |
https://doaj.org/article/fe1c5da67ac54c1bad78db9fd2da2194 |
long_lat |
ENVELOPE(-38.220,-38.220,-54.007,-54.007) |
geographic |
Main Island Pacific |
geographic_facet |
Main Island Pacific |
genre |
Kamchatka |
genre_facet |
Kamchatka |
op_source |
Terrestrial, Atmospheric and Oceanic Sciences, Vol 24, Iss 3, p 393 (2013) |
op_relation |
http://tao.cgu.org.tw/images/attachments/v243p393.pdf https://doaj.org/toc/1017-0839 https://doaj.org/toc/2311-7680 1017-0839 2311-7680 10.3319/TAO.2012.12.14.01(AA) https://doaj.org/article/fe1c5da67ac54c1bad78db9fd2da2194 |
_version_ |
1766051691501715456 |