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Fig. 6 | Earth, Planets and Space

Fig. 6

From: Estimation of fault models for short-term slow slip events from groundwater pressure in soft sedimentary layers

Fig. 6

Estimated fault model of the short-term SSE in July 2016. Black, dark blue, and green circles indicate AIST, NIED Hi-net, and JMA observation sites, respectively. Small blue circles indicate hypocenters of deep low-frequency tremor estimated by NIED. a The initial fault model estimate. The fault plane was fixed as 20 km × 20 km, and the slip amount on each fault patch was estimated by minimizing the sum of residuals after comparison with the observed strain, tilt and groundwater pressure distribution. The gray color scale shows the distribution of the residuals, and the red rectangle indicates the portion of the fault with the lowest residual. b The refined fault model. The red rectangle shows the length and width of the estimated fault model. Observed and calculated tilt changes are shown by red and blue arrows, respectively. c Observed and calculated principal strain changes. d Observed and calculated volumetric strain changes. At ANO1, ANO2, and HKSi, observed groundwater pressure changes were converted to volumetric strain changes. At Taharafukue and Gamagoriseida, volumetric strain changes were directly observed

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