Eruption Rate of Iwate Volcano during the past 100,000 years

Abstract

Iwate volcano is an active volcano at NE Japan. The volcano is composed of two volcanic bodies, Higashi-Iwate and Nishi-Iwate, which have an individual magma plumbing system. In this study, the eruption rate of Iwate volcano is estimated by the field observation and microgravity survey. The result is 2.3 to 3.8 x 10-2 km3; DRE/kyr during the last 70,000 years, that includes 3 volcanic stages. The eruption rate does not show the clearly difference between Higashi-Iwate and Nishi-Iwate. Thus, the supply of magma from the deeper area is considered as a control system that is driven to Higashi-Iwate and Nishi-Iwate.