Joint research of Japan and Russia for investigation of magma system and its eruption mechanism of the arc-type basaltic eruptive activity

对堪察加克柳切夫斯基火山进行了地球物理、地质和岩石学研究。我们安装了四个倾斜仪来构建地震仪网络，以监测火山活动。我们还继续维护在我们研究期间一直运作的网络。连续倾斜测量每10 - 20分钟检测一次循环变形。这一监测结果使得能够构建Strombolian型喷发的模式。另一方面，岩石学和地球化学分析表明，近3000年来的喷发物可分为两类玄武质岩浆，其中一类已逐渐被另一类玄武质岩浆所取代。此外，尽管在过去的80年里，火山喷发活动断断续续地持续着，但火山下面的岩浆系统在每一个休眠期之后都发生了变化。

Geophysical, geological and petrological research of Klyuchevskoy volcano, Kamchatka, was carried out. We installed four tiltmeters to construct the network with seismographs for monitoring of activity of the volcano. We have also continued to maintain the network, which has been working during our research period. Continuous tilt measurements detected cyclic deformation with every 10 - 20 minutes. This monitoring result enables to construct the model for the Strombolian type eruptions. On the other hand, petrological and geochemical analysis reveals that eruptive materials during the last 3000 years can be divided into two types of basaltic magma, one of which had been gradually replaced by another type of basaltic magma. In addition, although eruptive activity has continued intermittently during the last 80 years, magma system beneath the volcano has changed after each dormant period.