Abstract:We investigate characteristics of spatial biases in the Back‐projection method and the effectiveness of the Slowness Enhanced Back‐projection (SEBP). The spatial bias refers to the location error in Back‐projection caused by travel time errors due to 3D Earth structure. SEBP reduces such bias by calibrating the gradient of travel time (slowness) in the source. We first analyze 22 M4–M6 earthquakes in the Commander Island and find that the amplitudes and directions of spatial biases follow distinct regional pat… Show more
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