Crosshole measurement using two vertical boreholes can move individually transmitter and receiver, in which the horizontal resolution is not enough in two horizontally-arranged reflectors. In this report a MUSIC algorithm is introduced to 2-D estimation of reflectors with the crosshole tomographic data since the reflected signals generated from the different transmitters can be regarded as incoherent signals in the received array. We proposed a Music method to reduce the effect of the direct wave. It is shown by numerical simulations that this method can improve the resolution of the horizontally-arranged reflectors. Moreover, the relationship between the S/N ratio and the resolution is discussed.
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