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Earth, Planets and Space
Fig. 5 | Earth, Planets and Space

Fig. 5

From: Monitoring volcanic activity with distributed acoustic sensing using the Tongan seafloor telecommunications cable

Fig. 5

Power spectral densities of DAS records at channels 2000 (4.08 km from landing station), 8000 (16.32 km), and 14,000 (28.56 km) over the duration of our study. Lines and shaded areas indicate the average and standard deviation, respectively. The standard deviation of borehole strain-meter (BSM) data measured onshore in southern California in 2009 (black lines) are shown for comparison (Barbour and Agnew 2011)

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