This paper presents a new method to pick the seismic first arrival automatically.First,local attributes such as local standard deviation and local cross-correlation are computed from one trace of shot record.The local attributes are calculated within moving windows along the seismic trace,so that local attributes traces are produced.Then region growing method is used to identify the valid signal region and noise signal region based on the local attributes traces.The location of the edge of the identified two regions can be considered as the first breaking time of the seismic trace.The method has been tested on real data sets,and the results show that,with an appropriate tuning of its parameters,the method is robust under noisy conditions,computationally efficient,and easy to apply.
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