5:15 PM - 6:30 PM
[SSS32-P14] Opening crack associated with the 2015 eruption of the Hakone volcano estimated from InSAR
Keywords:Hakone Volcano, 2015 phreatic eruption, InSAR, Opening crack, Modeling
Estimated crack is trending NW-SE direction and dipping 82.2°NE, with 1.3 km in length and 0.3 km in width. Opening displacement was estimated to be 14.5 cm in a rectangular model. The opening distribution was estimated through the linear inversion, under the condition that the position and orientation of crack were fixed. The result showed that two peaks of opening were in the central shallow part and southern part. Volume changes of the crack were estimated 5.6×104 m3 in the rectangular model and 6.6×104 m3 in the linear model. It is considered that the intrusion of hot water or steam to the crack excited the swelling and triggered the eruption at Owakudani.