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The 2011 off the Pacific coast of Tohoku Earthquake related to a strong velocity gradient with the Pacific plate
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The 2011 off the Pacific coast of Tohoku Earthquake related to a strong velocity gradient with the Pacific plate
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Journal Article
The 2011 off the Pacific coast of Tohoku Earthquake related to a strong velocity gradient with the Pacific plate
2011
Overview
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-
V
p
/
V
s
zone. The trenchward low-
V
and low-
V
p
/
V
s
zone extending southwestward from the hypocenter may indicate the existence of a subducted seamount. The high-
V
zone and low-
V
p
/
V
s
zone might have accumulated the strain and resulted in the huge coseismic slip zone of the 2011 Tohoku Earthquake. The low-
V
and low-
V
p
/
V
s
zone is a slight fluctuation within the high-
V
zone and might have acted as the initial break point of the 2011 Tohoku Earthquake.
Publisher
Springer Berlin Heidelberg,Springer Nature B.V
Subject
