为后面的内容写一段总结和评价。 The rocks near a fault plane are commonly damaged by multiple earthquake ruptures which form damaged zones Damage zones are important structures controlling various properties of a fau

In summary, the article discusses the use of earthquakes that occur at depth within a fault-damaged zone as virtual sources and ground surface observations to extract Green's function between virtual source pairs to recover the structures between event pairs. The authors propose a complete theory on how to extract these virtual source Green's functions using surface stations deployed crossing a fault zone. The theory is based on stationary point and Fresnel zone theory to determine the upper and lower limit of the Green's function frequency band in a half-space. The authors also demonstrate that the virtual source Green's function can be recovered by linear seismic arrays deployed crossing the fault in a fault zone situation. Finally, they analyze different combinations of virtual source pair geometry and conclude that a larger virtual source distance is more practical to recover damaged zone structures at feasible frequency bands. Overall, the proposed method has the potential to provide valuable information on the structures controlling various properties of a fault, which can be useful in understanding earthquake mechanics and assessing seismic hazards.