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Fig. 8 | Earth, Planets and Space

Fig. 8

From: Complex microseismic activity and depth-dependent stress field changes in Wakayama, southwestern Japan

Fig. 8

Depth distribution of each faulting type. a Histograms of the depths for respective faulting types. Blue, red, and green histograms correspond to normal, reverse, and strike-slip focal mechanisms, respectively. Median depths for respective mechanisms are indicated by arrows. b Bootstrap sample distributions of the averages (left) and medians (right) of the depths for respective faulting types. Confidence intervals of 95% are also shown in the boxes. Bootstrap resamplings were carried out 1000 times. The lack of the medians for 6.01–6.10 and 6.31–6.40 km ranges is due to the accidental lacks of the original data in these ranges. In this study area, most of the focal mechanisms are categorized into these three groups, and the predominant depth differs among the groups: (1) N–S tensional normal fault-type events mainly occur in the shallower part, (2) E–W compressional reverse-fault-type events dominate at intermediate depths, and (3) N–S tensional and E–W compressional strike-slip-fault-type events mainly occur at the greatest depths

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