scholarly journals Strain anomalies induced by the 2011 Tohoku Earthquake (M w 9.0) as observed by a dense GPS network in northeastern Japan

2012 ◽  
Vol 64 (12) ◽  
pp. 1231-1238 ◽  
Author(s):  
Mako Ohzono ◽  
Yasuo Yabe ◽  
Takeshi Iinuma ◽  
Yusaku Ohta ◽  
Satoshi Miura ◽  
...  
Keyword(s):  
Tohoku Earthquake ◽  
2011 Tohoku Earthquake ◽  
The 2011 Tohoku Earthquake ◽  
Gps Network ◽  
Northeastern Japan

Impact of the 2011 Tohoku earthquake tsunami on zooplankton community in Otsuchi Bay, northeastern Japan

2015 ◽  
Vol 72 (1) ◽  
pp. 77-90 ◽  
Author(s):  
Yuichiro Nishibe ◽  
Hiroshi Isami ◽  
Hideki Fukuda ◽  
Shuhei Nishida ◽  
Toshi Nagata ◽  
...  
Keyword(s):  
Zooplankton Community ◽  
Tohoku Earthquake ◽  
2011 Tohoku Earthquake ◽  
The 2011 Tohoku Earthquake ◽  
Otsuchi Bay ◽  
Northeastern Japan

scholarly journals Report on a characteristic oscillation about 38 mHz (26 s) in northeastern Japan following surface wave of the 2011 Tohoku megathrust earthquake

2015 ◽  
Vol 202 (1) ◽  
pp. 419-423 ◽  
Author(s):  
Yuta Mitsui ◽  
Kosuke Heki
Keyword(s):  
Surface Wave ◽  
Velocity Structure ◽  
Tohoku Earthquake ◽  
Spectral Ratio ◽  
2011 Tohoku Earthquake ◽  
High Rate ◽  
The 2011 Tohoku Earthquake ◽  
Northeastern Japan ◽  
Characteristic Oscillation ◽  
Gnss Data

Abstract We try to detect an unidentified signal from the surface motion at northeastern Japan immediately after the 2011 Tohoku earthquake. A focused frequency range is 10–100 mHz (10–100 s). We find a peaky signal with frequency of about 38 mHz (26 s) based on the horizontal-to-vertical (H/V) spectral ratio using the high-rate GNSS data at 382 GEONET stations. We are not able to identify locality of the signal. The signal appears several minutes after the passing of surface wave fronts. The duration of the signal is about 2 min. Since the origin of the 38 mHz signal is unlikely to be local hydrologic tremors, tectonic tremors, or the tsunami, we speculate that the 38 mHz signal originates from a kind of a characteristic oscillation of Northeastern Japan triggered by the 2011 Tohoku earthquake. A normal-mode simulation implies that high-order radial overtones could create the signal with a spherically-layered velocity structure, however, the detailed mechanism of the signal still remains a mystery.

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