Skip to main content
Earth, Planets and Space
Fig. 2. | Earth, Planets and Space

Fig. 2.

From: Gravity variation around Shinmoe-dake volcano from February 2011 through March 2012—Results of continuous absolute gravity observation and repeated hybrid gravity measurements

Fig. 2.

Absolute gravity at the Kirisima Volcano Observatory (KVO in Fig. 1) as a function of Universal Time during the vulcanian eruption stage of Shinmoe-dake volcano in 2011. Δg stands for gravity deviation from a nominal value of 979,222,030 μgal. Approximately 90% of data in a set are within error bars as they represent 1.65 דstandard deviation of gravity values in a set”. Linear gravity decreases corresponding to the colored wedges are judged to be significant at either a 1% level (blue) or a 5% level (green), based on an F-test. The dotted wedges were identified by visual inspection but insufficient data are available to perform the F test. VE#1–VE#3 stand for vulcanian eruptions, E#4–E#5 for small-scale eruptions, and T#1–T#19 for ground tilt events that are likely to represent aborted or overlooked eruptions. Four tilt events t#12–t#15 seem to occur without corresponding significant gravity changes.

Back to article page