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| | Abstract | | Since 2012 we have carried out the time-lapse study in Al Wasse field, Saudi Arabia using the ACROSS seismic source. The previous records show very small temporal changes as much as 1 ms in the first arrivals, but very large temporal changes in the later arrivals. The same temporal changes were also observed in the data between June and December, 2015. The result of refraction survey using ACROSS shows the presence of Vp = 3.5 km/s at the top, Vp = 4.5 km/s as the basement layer and low-velocity layer below the top layer. The refracted wave travelling thorough 3.5 km/s layer show extremely small temporal changes. The large temporal changes come from the surface waves. The changes might be caused by the movement of aquifer due to water pumping. Very few stations among the grid stations show isolated 4.5 km/s arrivals and they show some temporal changes. |
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