Long-period (12sec) volcanic tremor observed at Usu 2000 eruption:
Seismological detection of a deep magma plumbing system
Mare Yamamoto, Hitoshi Kawakatsu,
Kiyoshi Yomogida, Junji Koyama
Geophys. Res. Lett., 29 , 43-1 - 43-4.
(PDF reprint)
Abstract
From a temporal deployment of a broadband seismic network
at Usu volcano, Japan,
we observed long-period (12 sec) volcanic tremors during the first few weeks
of the eruptive activity which started in the end of March, 2000.
The source of these long period tremors are located relatively deep
at a depth of 5 km, and their amplitude variation well correlates
with the uplift rate of the eruption area.
We thus attribute these long period tremors to the flow induced vibration
of a magma chamber and its outlet located around the source region
of the long period tremors.
This may be the first seismological detection of the dynamics of
a deep magma plumbing system.