Updates to and New Applications of the ATaCR Package for Tilt and Compliance Removal

Transfer function techniques are commonly used to remove tilt and compliance noise from broadband ocean bottom seismometers (BBOBS), particularly at periods longer than 10 s. Temporary deployments and cabled observatory installations utilizing BBOBS have increased in the past several years and involved a variety of different organizations globally. Furthermore, techniques utilizing non-traditional approaches, such as short-period ambient noise and the expanded use of horizontal-component seismic data, have also expanded. Here we present updates to the Automated Tilt and Compliance Removal (ATaCR) package, designed to help users both assess and remove noise from BBOBS projects. In particular, we have improved flexibility and assessment metrics to better meet the variety of approaches necessary for modern analyses. Notable additions include: (1) summary figures assessing tilt properties; (2) improved phase analyses to discriminate between microseismic and other sources of noise; (3) expanded flexibility to incorporate a variety of data and metadata, such as quality control metrics, and instrument handedness; (4) generalized TF removal algorithm to allow exploration of non-traditional correction sequences; (5) transfer function workflows for ambient noise imaging.