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The 2011 off the Pacific coast of Tohoku Earthquake related to a strong velocity gradient with the Pacific plate
| Content Provider | Semantic Scholar |
|---|---|
| Author | Matsubara, Makoto Obara, Kazushige |
| Copyright Year | 2011 |
| Abstract | We conduct seismic tomography using arrival time data picked by NIED Hi-net, including earthquakes off the coast, outside the seismic network. For these offshore events, we use the NIED F-net focal depth. We detect two low-V. zones in the uppermost subducting oceanic crust. The landward low-V zone with a large anomaly corresponds to the western edge of the coseismic slip zone of the 2011 off the Pacific coast of Tohoku Earthquake. The asperities of the previously known Off-Miyagi and Off-Fukushima earthquakes with magnitudes around 7.0 are also located at the boundary of the low-V and the eastern high-V zones. The initial break point (hypocenter) is associated with the edge of a slightly low-V and low-Vp/Vs zone. The trenchward low-V and low-Vp/Vs zone extending southwestward from the hypocenter may indicate the existence of a subducted seamount. The high-V zone and low-Vp/Vs zone might have accumulated the strain and resulted in the huge coseismic slip zone of the 2011 Tohoku Earthquake. The low-V and low-Vp/Vs zone is a slight fluctuation within the high-V zone and might have acted as the initial break point of the 2011 Tohoku Earthquake. |
| Starting Page | 663 |
| Ending Page | 667 |
| Page Count | 5 |
| File Format | PDF HTM / HTML |
| DOI | 10.5047/eps.2011.05.018 |
| Volume Number | 63 |
| Alternate Webpage(s) | http://www.terrapub.co.jp/journals/EPS/pdf/2011/6307/63070663.pdf |
| Alternate Webpage(s) | https://earth-planets-space.springeropen.com/track/pdf/10.5047/eps.2011.05.018 |
| Alternate Webpage(s) | https://doi.org/10.5047/eps.2011.05.018 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
