scholarly journals Criticality features in ULF magnetic fields prior to the 2011 Tohoku earthquake

2015 ◽  
Vol 91 (1) ◽  
pp. 25-30 ◽  
Author(s):  
Masashi HAYAKAWA ◽  
Alexander SCHEKOTOV ◽  
Stelios POTIRAKIS ◽  
Kostas EFTAXIAS
Keyword(s):  
Magnetic Fields ◽  
Tohoku Earthquake ◽  
2011 Tohoku Earthquake ◽  
The 2011 Tohoku Earthquake ◽  
Ulf Magnetic Fields

scholarly journals ULF/ELF Atmospheric Radiation in Possible Association to the 2011 Tohoku Earthquake as Observed in China

2016 ◽  
Vol 5 (2) ◽  
pp. 47 ◽  
Author(s):  
A. Schekotov ◽  
H. J. Zhou ◽  
X. L. Qiao ◽  
M. Hayakawa
Keyword(s):  
Magnetic Fields ◽  
Yunnan Province ◽  
Main Shock ◽  
Epicentral Distance ◽  
Tohoku Earthquake ◽  
2011 Tohoku Earthquake ◽  
Atmospheric Radiation ◽  
Mean Square ◽  
Frequency Range ◽  
The 2011 Tohoku Earthquake

Recordings of a search-coil magnetometer located in Yongsheng in the Yunnan province of China have been used to find atmospheric ULF/ELF precursors to the 2011 Tohoku earthquake (EQ) with M=9 which occurred on 11 March 2011 with a large epicentral distance of about 4100 km. The combined characteristics of the horizontal magnetic fields, the ratio of tangential and radial field components in the numerator and root mean square of ellipticity in the denominator, were used to detect seismo-related ULF/ELF signals. This value is found to increase before the EQ, and then to decrease during a few weeks, with a reliable maximum on 8 March (3 days before the EQ). We also analyzed azimuth distributions of pulsed radiation in the frequency range 2-5 Hz during the previous week before the main shock. This radiation reached a maximal value on 10 March - one day before the EQ date, and the azimuth of its source is estimated to coincide with the position of the main shock. The results are further compared with the ULF/ELF precursors of the same EQ observed at 3 stations in Japan by Ohta et al. (2013).

Analysis of traveling ionospheric disturbances (TIDs) in GPS TEC launched by the 2011 Tohoku earthquake

Radio Science ◽  
2016 ◽  
Vol 51 (5) ◽  
pp. 507-514 ◽  
Author(s):  
Geoff Crowley ◽  
Irfan Azeem ◽  
Adam Reynolds ◽  
Timothy M. Duly ◽  
Patrick McBride ◽  
...  
Keyword(s):  
Tohoku Earthquake ◽  
2011 Tohoku Earthquake ◽  
Ionospheric Disturbances ◽  
The 2011 Tohoku Earthquake ◽  
Gps Tec ◽  
Traveling Ionospheric Disturbances

Tsunami source of the 2011 Tohoku earthquake detected by an ocean-bottom magnetometer

2013 ◽  
Vol 382 ◽  
pp. 117-124 ◽  
Author(s):  
Hiroshi Ichihara ◽  
Yozo Hamano ◽  
Kiyoshi Baba ◽  
Takafumi Kasaya
Keyword(s):  
Tohoku Earthquake ◽  
2011 Tohoku Earthquake ◽  
Tsunami Source ◽  
Ocean Bottom ◽  
The 2011 Tohoku Earthquake
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