Economic and Environmental Geology

Fig. 3.

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Fig. 3. Construction of subsurface density structure model along the seismic profile. (A) Seismic reflection profile (Malehmir et al., 2022; see Fig. 1C for its location), which shows prominent reflectivities at depths of about 1, 3, 5, 7 and 8 km (R1 – R5). Comparing these reflectivities and the geologic map (Fig. 1B), we speculated rock types at each depth. (B) P-wave velocity distribution, which shows the core of the Dongducheon fault (DF) corresponds to the low velocity zone with a width of about 200 m. (C) Density distribution, which was calculated from the P-wave velocity (Fig. 2B). (D) the shear wave velocity model (Kil et al., 2021) along the seismic profile. The western region from the DF is characterized by high shear wave velocity to a depth of 3 km, while the eastern region shows relatively low velocity. Densities for each 1 km thick layer are calculated from the shear-wave velocity (Fig. 2B). (E) Comparison of all available geophysical information, which will be used as constraints for the gravity forward modeling.
Econ. Environ. Geol. 2022;55:633-48
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