11:15 AM - 11:30 AM
[STT49-03] Aeromagnetic survey in Shinmoedake volcano after the 2017 eruption
Keywords:Shinmoedake volcano, aeromagnetic survey, unmanned helicopter
On 11th October 2017, Shinmoedake volcano has erupted again which are supposed to be phreato or phreatomagmatic eruptions, although it was not very critical. After that, we've conducted an aeromagnetic survey again. It was a 6th repeated measurement on the same tracks. Following a way of the previous surveys, a flight course of an unmanned helicopter is about 100m above the ground, and an interval of each measure line is also about 100m. A total distance of measurement lines is 26 km.
The survey was conducted on 31st October just after the eruption, but geomagnetic total intensity data still show a clear pattern of slightly further remagnetization nevertheless. An amount of volcanic ashes is estimated as 0.3Mm^3 (JMA), while a volume of lava in the crater is about 15 Mm^3 (Kozono et al., 2013). Therefore, although we cannot detect a localized anomaly related to this eruption so far, a geomagnetic field change as a whole was not affected by this small eruption and thus it may be still getting cooler.