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Fig. 3. | Earth, Planets and Space

Fig. 3.

From: Precise aftershock distribution of the 2011 off the Pacific coast of Tohoku Earthquake revealed by an ocean-bottom seismometer network

Fig. 3.

Final hypocenter distribution (March 15th–June 18th, 2011) derived by using the maximum-likelihood estimation technique with bathymetry. The circles filled with color indicate the hypocenters of aftershocks located with a spatially high resolution. The depth of events are color-coded, and diameters of the circles are proportional to magnitudes. Red contours indicate depths of surface of the subducting Pacific plate by a model estimated from hypocenter distribution and seismic structures using OBSs. No exaggeration for the vertical direction is applied. In the epicenter distribution, the aftershocks may be divided into a number of clusters from a geometrical viewpoint. In the vertical section, the concentration of the aftershocks in depths shallower than 60 km is clearly recognized. From the W-E vertical cross-section, the aftershocks become deeper to the westward.

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