Application of first-break amplitude analysis technology in quality control during ocean bottom node acquisition

The ocean bottom node (OBN) boasts the advantages of more flexible deployment, better seabed coupling, and higher signal-to-noise ratio (SNR). However, the non-real-time acquisition mode also raises many challenges for quality control. These include cumbersome verification of the OBN clock drift correction accuracy, as well as a lack of methods for accurately verifying the rotation accuracy of three-component geophone data after vector rotation and the OBN positioning accuracy after underwater towing events. This study extracted the information on near-offset first breaks from the OBN data to generate a four-component amplitude diagram through appropriate arrangement and difference calculation. By investigating the amplitude attributes under different conditions, targeted quality control was achieved. This method demonstrated excellent quality control effects in practical applications, making it an important tool for quality control in OBN acquisition.