scholarly journals Changes in seismicity before and after the 2011 Tohoku earthquake around its southern limit revealed by dense ocean bottom seismic array data

2015 ◽  
Vol 42 (5) ◽  
pp. 1384-1389 ◽  
Author(s):  
Yukihiro Nakatani ◽  
Kimihiro Mochizuki ◽  
Masanao Shinohara ◽  
Tomoaki Yamada ◽  
Ryota Hino ◽  
...  
Keyword(s):  
Tohoku Earthquake ◽  
Seismic Array ◽  
2011 Tohoku Earthquake ◽  
Ocean Bottom ◽  
The 2011 Tohoku Earthquake ◽  
Southern Limit ◽  
Array Data ◽  
Before And After

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

Analysis of Pressure and Acceleration Signals from the 2011 Tohoku Earthquake Observed by the DONET Seafloor Network

2017 ◽  
Vol 12 (1) ◽  
pp. 163-175 ◽  
Author(s):  
Hiroyuki Matsumoto ◽  
◽  
Mikhail A. Nosov ◽  
Sergey V. Kolesov ◽  
Yoshiyuki Kaneda ◽  
...  
Keyword(s):  
Gravity Waves ◽  
Forced Oscillation ◽  
Tohoku Earthquake ◽  
Water Layer ◽  
2011 Tohoku Earthquake ◽  
Forced Oscillations ◽  
Ocean Bottom ◽  
The 2011 Tohoku Earthquake ◽  
Characteristic Frequencies ◽  
Acceleration Sensors

Ocean-bottom pressure and acceleration data simultaneously recorded by the DONET seafloor network during the 2011 Tohoku earthquake approximately 800 km from the earthquake epicenter are processed and analyzed. The close location of pressure and acceleration sensors together with the high data-sampling rate enable us to quantitatively examine and interpret pressure variations together with ocean-bottom acceleration for the first time to our knowledge. To interpret observed data, we introduce a set of characteristic frequencies that enable us to identify physical processes responsible for water layer behaviour dependent on the frequency of ocean-bottom oscillations. Explicit formulas are given for calculating all of the characteristic frequencies, which are the basis for introducing nonoverlapping frequency bands, i.e., hydroacoustic waves, forced oscillations, and gravity waves. The physical correctness of such a subdivision is confirmed by the high coherence and nearly zero phase difference between in-situ measured pressure and acceleration variations observed in the forced oscillation frequency band – a band neither hydroacoustic nor gravity waves are generated by ocean-bottom oscillation because the water layer simply follows the ocean bottom, generating forced oscillations. The dominant, long-lasting pressure fluctuations recorded by DONET during the 2011 earthquake are associated with the forced oscillation, or, more precisely, with water and sedimentary layer coupling oscillation. DONET clearly observed the 2011 Tohoku tsunami signal during more than 24 hours following the earthquake. In contrast to DART records, phase dispersion was not manifested in the tsunami signals registered by DONET.

Analysis of Hourly Demand Data before and after the 2011 Tohoku Earthquake

2015 ◽  
Vol 192 (3) ◽  
pp. 46-53
Author(s):  
Takuji Chida ◽  
Hiroumi Saitoh ◽  
Junichi Toyoda
Keyword(s):  
Tohoku Earthquake ◽  
2011 Tohoku Earthquake ◽  
The 2011 Tohoku Earthquake ◽  
Before And After

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
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