AbstractNear-surface imaging structures often plays a significant role in the field of environmental and engineering geophysics. Early-arrival waveform inversion (EWI) is state-of-the-art method to imaging near-surface structures due to its high resolution. However. the method faces with cycle-skipping issue which might lead to an unexpected local minimum. https://www.markbroyard.com/flash-grab-hobbit-door-on-sale-limited-grab/