The ionospheric precursor to the 2011 march 11 earthquake as based on the Japan-pacific subionospheric VLF/LF network observation

• Дата: 2012
• Автори: Hayakawa, M., Hobara, Y., Rozhnoi, A., Solovieva, M., Ohta, K., Izutsu, J., Nakamura, T., Yasuda, Y., Yama-guchi, H., Kasahara, Y.
• Формат: Стаття
• Мова: English
• Опубліковано: Інститут радіофізики і електроніки ім. А.Я. Усикова НАН України 2012
• Назва видання: Радіофізика та електроніка
• Теми: Распространение радиоволн, радиолокация и дистанционное зондирование
• Онлайн доступ: http://dspace.nbuv.gov.ua/handle/123456789/105922
• Назва журналу: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Цитувати: The ionospheric precursor to the 2011 march 11 earthquake as based on the Japan-pacific subionospheric VLF/LF network observation / M. Hayakawa, Y. Hobara, A. Rozhnoi, M. Solovieva, K. Ohta, J. Izutsu, T. Nakamura, Y. Yasuda, H. Yama-guchi, Y. Kasahara // Радіофізика та електроніка. — 2012. — Т. 3(17), № 4. — С. 64-69. — Бібліогр.: 27 назв. — англ.

By using the network observation of subionospheric VLF/LF signals in Japan and in Russia, we have found a significant ionospheric perturbation prior to the recent 2011 March 11 Japan earthquake (EQ) in the off-sea of the Tohoku area, which was an exceptionally huge plate-type EQ. A remarkable anomaly (with decrease in the nighttime amplitude and also with enhancement in dispersion) has been detected on March 5 and 6 on the propagation path from the NLK transmitter (Seattle, USA) to Chofu (together with Kochi and Kasugai), and also we 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 on the path from JJI transmitter (Miyazaki, Kyushu) to Kamchatka, Russia.