Fig. 8
![Fig. 8](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs40623-020-01197-z/MediaObjects/40623_2020_1197_Fig8_HTML.png)
Comparison of infrasound and thermal data with surface-activity parameters recorded between September 1, 2014, and December 31, 2018. a Maximum pick pressure from the Chaparral sensor data at ACOLM station since December 2016. The periods shown by the blue arrows are the same as those in Fig. 7. b The same thermal anomaly data as in Fig. 4b. c Daily counts of icequakes at NRV (gray) and NTV (light blue). d Air temperature recorded by OLLETA weather station