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Haruhisa Nakamichi 8 years, 8 months ago

Suwanosejima volcano in the southwestern part of Japan is an andesitic volcano currently characterized by explosive eruptions at intervals of 2-4 weeks since 1957. Recently, small ash eruptions called strombolian or vulcanian eruptions have occurred over periods of a few days to months at the central crater. Explosive eruptions were followed by continuous lava effusion and degassing. Explosive earthquakes were followed by continuous tremors with the period from several minutes to hours. Continuous tremors became suddenly weak and were unclear and associated with weak tilt detected inflation of the volcano edifice a few minutes before explosive eruptions.