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Fig. 3. | Earth, Planets and Space

Fig. 3.

From: High-frequency rupture properties of the Mw 9.0 off the Pacific coast of Tohoku Earthquake

Fig. 3.

Comparison of high- and low-frequency results. (a) The relative amplitude of high- (blue) and low-frequency (red) back-projection results as a function of time. (b) Spatial comparison of energy locations for two frequencies. The background colour (red/warms colours indicate large energy release locations and blue/cold colours show low energy release regions) shows the low-frequency energy distribution around 80 seconds after the event initiation. The white contour shows the high-frequency energy release location between 50 and 110 seconds. The range in time window used for obtaining the high-frequency contour allows us to compare high-frequency results (with very fine time resolution) with lower-frequency results (poorer time resolution). The white star shows the epicentral location determined by high-frequency coherency function. (c) Same as in (b) except for the 180-second peak for the low-frequency result. The high-frequency contour is calculated between 150 and 210 seconds. The colour scale has been normalized, but the peak amplitude for this 180-second energy is about 23% of the peak shown in (b).

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