They suggest that some surface change did occur along the Idosawa fault as identified in the interferogram, but we were not able to infer the fault motion sense and/or amount of offset from the observed cracks. These suggest that significant fault ruptures occurred at a rather shallow depth, although there are no reports of the appearance of earthquake surface faults or surface cracks. The photographs A and B, viewed from west and north, respectively, show that the hanging wall block drops down relative to the footwall one, which is of normal fault with west-dipping. To pick up the crustal deformation due to the inland earthquakes, we assumed that the far-field displacement was zero and that the residual phases were expressed by a quadratic surface, and we subtracted the evaluated bilinear function from the original interferogram. Statist., 7, 1–26, 1979. In the interferogram of the Mj 7.0 event, the phase changes associated with the Mj 6.1 and the Mj 6.0 events are included. For both the rectangular fault model and the slip distribution model, the preferred dip angle is evaluated to be 50 ~ 60°. Despite the several such outstanding features of this event, however, it remains uncertain where and how the faults were involved in the seismic event. In particular, there is little residual in the proximity of the Yunotake fault. The inferred west-dipping normal fault motion on the Yunotake fault is correlated with the present-day topographic features, consistent with the idea that the historically-repeated normal faultings have developed the topography. Despite the simple fault models with uniform slips on planar faults, our fault models are able to reconcile the spatial pattern of displacement distribution well, suggesting that the derived fault models macroscopically pick up the nature of the source. Simulated interferograms calculated from west-dipping faults with dip angles of (a) 80°, (b) 60°, and (c) 40°, respectively. Displacement jumps are identified at some points, indicated by arrows. Lines X–X′ and Y–Y′ are cross-section lines shown in Fig. The positions of the left and right upper edges for each fault plane are shown in Fig. The following conclusions were derived from the analyses: The most concentrated crustal deformation is located ~20 km west of the city of Iwaki, showing displacements away from the satellite with ~2.2 m at the maximum. PubMed Google Scholar. It is found that b value calculated through Gutenberg–Richter law has shown better b value of 1.0 according to tectonics of the Fukushima area. Terms and Conditions, Figure 5 shows photographs taken at some points corresponding to the displacement discontinuities in the interferogram. On the other hand, a moderate-angle model can reproduce well the characteristics that neither high- nor low-angle models can explain (Fig. Actually fault dislocations were in general larger along Idosawa Fault (most of the observation ranging from 0.8 to 1.5 meters) than those along Yunotake Fault (Figure 2). For the calculation, we attempted both west- and east-dipping faults. The ALOS/PALSAR data was processed using GSISAR software (Fujiwara and Tobita, 1999; Fujiwara et al., 1999; Tobita et al., 1999; Tobita, 2003). Natural Hazards LOS displacement profiles show the clear gaps of ~10 cm for the Mj 6.0 event (Fig. We also detected some surface cracks along the Idosawa fault in our field survey (Photo E). Field surveys reveal that earthquake surface faults appeared to be associated with the Mj 7.0 event, and we confirmed that the discontinuities in the interferogram do correspond to the surface ruptures.

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