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首页> 外文期刊>Earth, planets and space: EPS >Evaluation of recent activity at Satsuma-Iwojima—Felt earthquake on June 8, 1996—
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Evaluation of recent activity at Satsuma-Iwojima—Felt earthquake on June 8, 1996—

机译：对1996年6月8日萨摩县岩岛地震的近期活动的评估

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Emission of large amount of volcanic gas occurs at the summit crater of Satsuma-Iwojima volcano located south of Kyushu, Japan. Sakurajima Volcanological Observatory (SVO), DPRI, Kyoto University has conducted seismic observation at a permanent station 1.5 km WNW of the summit crater since June 1995. Volcanic earthquakes at the volcano are classified into A-type (high frequency), B-type (low frequency), C-type (monochromatic) and tremor. A-type earthquake generated by shear fracture and B-type earthquake with volumetric source are dominant at the volcano. Volcanic activity of Satsuma-Iwojima was evaluated from seismicity of the volcanic earthquakes. During the period of 1995-1998, the seismicity has remained at a constant level with seismic energy release rate of 7 1014 erg/year. The seismicity was as high as that during 1975-1977. The energy release rate of volcanic earthquakes at the volcano has been stable at least for recent 20 years. Within the stable activity, a minor increase in activity occurred in mid-1990's, as shown by a felt earthquake (M2.9) on June 8, 1996. The earthquake on June 8, 1996 may be related to topographic changes and ground deformation around the summit crater, because a crack with length of 100 m was found at southeast rim of the summit crater in October 1996 and the benchmark near the crack moved eastward by 6 cm during the period from June 1995 to April 1997. The stable activity for 20 years and minor inflation of activity estimated from seismic observation coincides with those from SO2 flux, highest fumarolic temperatures and gas equilibrium temperatures. Although daily number of B-type earthquakes with smaller amplitude increased almost 10 times in September 1998, this increase in the seismicity did not accompany any change of eruptive activity. Unstable seismicity of B-type earthquake may reflect fluctuations of condition in the gas conduit.
机译：位于日本九州以南的萨摩和岩岛火山的山顶火山口处，大量火山气体的排放。自1995年6月以来，京都大学DPRI樱岛火山天文台（SVO）一直在山顶火山口西侧1.5 km的永久站点进行地震观测。火山中的火山地震分为A型（高频），B型（低频），C型（单色）和震颤。在火山中，剪切断裂引起的A型地震和体积源的B型地震占主导地位。根据火山地震的地震活动性评估了萨摩岩城的火山活动。在1995-1998年期间，地震活动度保持恒定，地震能量释放速率为7 10 14 erg /年。地震活动性高达1975-1977年。至少在最近20年中，火山中火山地震的能量释放速率一直稳定。在稳定的活动范围内，如1990年6月8日的毛毡地震（M2.9）所示，活动在1990年代中期出现了小幅增加。1996年6月8日的地震可能与周围的地形变化和地面变形有关因为在1996年10月在山顶陨石坑的东南缘发现了一条长100 m的裂缝，并且在1995年6月至1997年4月期间裂缝附近的基准向东移动了6cm。20年的稳定活动地震观测估计的年数和轻微的活动性膨胀与SO 2 通量，最高的富马酸温度和气体平衡温度相一致。尽管在1998年9月，日振幅较小的B型地震的日数增加了近10倍，但这种地震活动性的增加并未伴有喷发活动的任何变化。 B型地震的不稳定地震活动可能反映出气体管道中条件的波动。

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