期刊
EARTH PLANETS AND SPACE
卷 63, 期 7, 页码 891-896出版社
TERRA SCIENTIFIC PUBL CO
DOI: 10.5047/eps.2011.07.003
关键词
Earthquake; ionospheric disturbance; SuperDARN; Rayleigh wave; acoustic wave; ground/sea scatter echoes; Hokkaido radar; high temporal resolution
资金
- Ministry of Education, Culture, Sports, Science and Technology of Japan [19340141]
- Grants-in-Aid for Scientific Research [19340141] Funding Source: KAKEN
Ionospheric responses to the 2011 off the Pacific coast of Tohoku Earthquake are studied using the SuperDARN Hokkaido radar, which is located at (43.5 degrees N, 143.6 degrees E) and which monitors the ionosphere over a wide horizontal area. The radar observed an oscillation of the vertical motion of the ionosphere with a period of about 1 to 2 min. The disturbance propagated northward, away from the epicenter with the velocity of about 6.2, 4.5, 3.9 and 3.5 km/s. The latter three values are basically consistent with the propagation of the Earth's surface waves reported in several previous studies. The propagation velocities decreased with time, which has not been reported in previous studies for this propagation velocity range. The peak-to-peak amplitudes of Doppler velocities of ground/sea scatter echoes observed by the radar were up to 200 m/s, which is considerably larger than previously-reported values using HF Doppler measurements, although they are not extremely large for this historical earthquake (M = 9.0). This is the first time that ionospheric data have been obtained with high temporal (8 s) and spatial (22.5 km) resolutions following a giant earthquake, which enables us to discuss the detailed characteristics of the propagation of coseismic ionospheric disturbances.
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