Explosions and periodic tremor at Karymsky volcano, Kamchatka, Russia
Explosions and periodic tremor at Karymsky volcano, Kamchatka, Russia
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俄罗斯堪察加半岛卡雷姆斯基火山发生爆炸和周期性震动
DOI：
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
M. Ripepe
中科院分区：
文献类型：
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作者：
J. Lees;E. Gordeev;M. Ripepe
Karymsky火山的爆发经常产生包含声学和地震传感器记录的重复脉冲序列的信号，称为chugging。这些脉冲的幅度与脉冲之间的时间间隔相关。对于给定的测量声压，地震振幅取任意值，直到特定的经验确定的阈值。相反，具有小地震振幅的事件产生具有大变化的声波，并且大振幅地震事件对应于大声波。这些观察结果与共振导管模拟的源不一致。相反，由一系列离散脉冲组成的模型解释了这些数据，并为理解排气口脱气的动态提供了一个框架。突突声的物理模型涉及一个随时间变化的变窄排气口，其中气体以一系列振荡的形式释放，这些振荡看起来是谐波，但实际上被建模为短期瞬变或离散脉冲，暗示了阻塞流。
SUMMARY The explosions of Karymsky volcano often produce signals containing a sequence of repeating pulses recorded on acoustic and seismic sensors, known as chugging. The amplitudes of these pulses correlate with the time interval between pulses. For a given measured acoustic pressure, seismic amplitudes take on arbitrary values up to a specific, empirically determined threshold. Conversely, events with a small seismic amplitude yielded acoustic waves with large variations and large-amplitude seismic events corresponded to large acoustic waves. These observations are not consistent with a source modelled by a resonating conduit. Rather, a model consisting of a sequence of discrete pulses explains the data and provides a framework for understanding the dynamics of degassing at the vent. The physical model for chugging involves a time-varying narrowing vent where gasses are released in a series of oscillations which appear to be harmonic but instead are modelled as short-term transients, or discrete pulses, suggestive of choked flow.