Structural map of the area adjacent to Lajishan (a), longitudinal schematic diagram of profile A–B (b), spatial relationship between the B–B’ profile and the local faults (c), and spatial relationship between the C–C profile in Figure 2c and th (IMAGE)
Caption
The Lajishan Fault has two main faults on the southern and northern margins, but the internal faults are very complex. The figure shows the structure of the area near the Lajishan Fault Zone in a magnified view. The western side of the Lajishan Fault is compressed by the Riyue Shan Fault, whereas the southern side is controlled by the West Qinling Fault Zone, which blocks southeast-directed ruptures, leading to severe compressive deformation within the fault zone and the formation of multiple secondary faults that are either exposed or buried underground. The fault zone on the northern margin of Lajishan is composed of the main fault (F1) dipping toward the southwest and an accompanying fault (F2) with the opposite dip direction, whereas the fault zone on the southern margin of Lajishan is composed of the main fault (F3) dipping toward the southwest and a fault (F5) with the opposite dip direction. These faults led to the uplift of Lajishan through long-term extrusion, resulting in substantial elevation differences in the surrounding areas. The spatial relationships among the B–B′ profile, the C–C′ profile, and the local faults near the epicenter in our relocated results (c and d) revealed that the aftershock sequence occurred mainly near faults F1 and F2, with both faults showing partial activity and that density area B was characterized primarily by active fault F1.
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Beijing Zhongke Journal Publising Co. Ltd.
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