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. 2023 Aug 20;13:13548. doi: 10.1038/s41598-023-39672-8

Figure 9.

Figure 9

The Hi’iaka self-potential anomaly, the Kilauea volcano, Hawaii, USA. (1) The Hi’iaka SP anomaly profile surveyed in 1973. (2) The Hi’iaka SP anomaly profile surveyed in 1995. (3) The Hi’iaka SP anomaly profile surveyed in 1997. (4) The Hi’iaka SP anomaly profile surveyed in 2012. For each anomaly profile, (a) observed and calculated data. (b) Derivative of the observed SP data illustrated in (a). (c) Analytic signal amplitude. (d) Image.