We have been hard at work getting the most out of the data MST recently collected at the Eden Geothermal project in Cornwall. Part of this experiment used an airgun source at the surface and a fiber optic cable installed in the well to collect check shot data. Since the airgun source was small(ish) a key component of the acquisition was to stack the signals from multiple shots, and as it turns out this makes a nice way to show how MST’s processing software can enhance signals. In the “before” image (left of the divider) above we have a very basic stack of the 65 check shots for this location. Whilst you can make out a few things in the data from this figure such as the arrivals near the surface (channel 0), there is only so much that can be gleaned from this basic stack. In contrast, the “after” image (right of the divider) shows MST’s processed stack using the same data. Now a P-wave arrival can be traced down the well to over 3000m (channels have a 1m spacing). We can also see tube waves and other phases, all of which provide valuable information about the structure in and around the well.