首页> 外文期刊>Journal of geophysical research. Solid earth: JGR >Switching between seismic and seismo-acoustic harmonic tremor simulated in the laboratory: Insights into the role of open degassing channels and magma viscosity
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Switching between seismic and seismo-acoustic harmonic tremor simulated in the laboratory: Insights into the role of open degassing channels and magma viscosity

机译:在实验室模拟的地震和地震声谐波震颤之间切换:洞察开放的除气通道和岩浆粘度的作用

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Switching between seismic-only harmonic tremor (SHT) and seismo-acoustic harmonic tremor (SAHT) has been reported at few volcanoes worldwide, but its occurrence may indicate important changes in shallow conduit conditions. Switching was simulated in a laboratory experiment in which harmonic signals were produced with a flow-driven valve and compressed air. The harmonic signals were passed through a tank of shear-thinning viscoelastic fluid, and the resulting signals were recorded. At high fluid stiffness, a stable, open conduit was produced, and the harmonic signals generated within the experimental apparatus were efficiently transmitted into the atmosphere. At lower fluid stiffness, bubbling dominated the activity, stable pathways were not generated in the fluid, and HT was not recorded in the atmosphere. These results are compared to observations of switching at Fuego volcano, Guatemala. We conclude that at intermediate magma viscosities, the development of stable degassing pathways open to the atmosphere will allow HT generated in the conduit to be transmitted into the atmosphere. Further, subtle changes in magma properties and supply rate may control whether SHT or SAHT is recorded, providing information about the state of the shallow conduit and vent at active volcanoes. Key Points Seismic and acoustic harmonic tremor analogues were generated in the lab Atmospheric signals were recorded when channels opened in the viscoelastic fluid Magma viscosity is associated with SHT - SAHT switching at active volcanoes
机译:在世界范围内的少数火山中,已经报道了在仅地震谐波震颤(SHT)和地震声谐波震颤(SAHT)之间切换,但是它的发生可能表明浅层导管条件发生了重要变化。开关是在实验室实验中模拟的,在该实验中,流量控制阀和压缩空气产生了谐波信号。谐波信号通过剪切稀化粘弹性流体储罐,并记录所得信号。在高流体刚度下,产生了稳定,开放的导管,并且在实验设备内产生的谐波信号被有效地传输到大气中。在较低的流体刚度下,起泡作用占主导地位,在流体中未生成稳定的途径,并且在大气中未记录到HT。将这些结果与在危地马拉的Fuego火山的转换观测结果进行了比较。我们得出的结论是,在中等岩浆粘度下,向大气开放的稳定脱气路径的发展将使导管中产生的HT传递到大气中。此外,岩浆性质和供应速率的细微变化可以控制是否记录SHT或SAHT,从而提供有关浅层管道和活动火山口的状态的信息。要点在实验室中产生了地震和声学谐波震颤类似物,当在粘弹性流体中打开通道时,记录了大气信号。岩浆粘度与活火山处的SHT-SAHT转换有关

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