oa Surface-DAS Seismic Acquisition Experiment using Various Types of Fiber Optic Cable at the Aquistore CCS Site

A field experiment of the DAS seismic acquisition using various fiber optic cables (FOCs) buried at approximately 50 cm depth in the surface ground was conducted at the Aquistore CCS site in November 2023. The primary purpose is to evaluate the seismic responses of the linear cable and the custom-made helically wound cable (HWC). The total length of the cable was almost 5 km, comprising four kinds of FOCs spliced in series to form a single loop: 1) a 30-degree HWC, 2) a linear FOC, 3) a 60-degree HWC, and 4) a lead-in FOC. The active sources consisted of dynamite sources and a permanent rotary seismic source. Inspection of the acquired shot records shows that the acquired data generally have good quality. Further analysis will focus on the variation of seismic response with the incident angle and azimuth.