A Synthesis Review of Emissions and Fates for the Coal Oil Point Marine Hydrocarbon Seep Field and California Marine Seepage

Figure 6

Long-term acoustic spectral observations for the North Sea 22/4b seep site and daily average (right axis). Fine striations (subdaily) are tidal emission variations. The acoustic spectrum relates to the bubble size spectrum. The September data gap reflects retrieval and deployment of a second recorder. From Wiggins et al. [51].