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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Estimation of permeability and degassing depth of Iwodake volcano at Satsuma-Iwojima, Japan, by thermal observation and numerical simulation
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Estimation of permeability and degassing depth of Iwodake volcano at Satsuma-Iwojima, Japan, by thermal observation and numerical simulation

机译：通过热观测和数值模拟估算日本萨摩市岩岛的岩岳岳火山岩的渗透率和除气深度

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摘要

The thermal activity of the Iwodake volcano at Satsuma-Iwojima, Japan, is characterized by the predominant volcanic gas discharge at the summit crater and heat discharge from the high ground temperature area, which is distributed widely from the summit crater to the mountainside. In this study, the surface temperature distribution was obtained by an airborne survey using an infrared thermal camera to estimate the heat flux from the ground surface to the atmosphere. The heat discharge rate from the high ground temperature area was estimated to be 22 and 84 MW at the summit and the mountainside, respectively. Earlier studies showed that the volcanic gas at the summit crater was of magmatic origin with a discharge rate of 400 kg/s and that the degassing depth was very shallow. The degassing activity of the Iwodake volcano is thought to have continued for more than 800 years. The continuous active degassing at shallow depth probably results in the development of a hydrothermal syste0m within the volcano because the volcanic gas ascending the degassing vent from the top of the magma to the surface is diffused to the surrounding formation. The diffused volcanic gas produces a wide-ranging surface temperature anomaly. The development of such a hydrothermal system was studied using a numerical simulation. The results confirmed that the overall thermal activity of the Iwodake volcano, i.e., the volcanic gas ejection at the summit crater, widely distributed ground temperature anomaly on the mountainside, and hot springs along the coast, could be formed by the degassing activity. Important factors controlling the wide-ranging hydrothermal system are the permeability of the volcanic edifice and the depth of degassing. Simulations indicated that degassing depth from 300 to 500 m below the ground surface, permeability of the mountain edifice above 7 x 10~(-14), and vent permeability from 3.8 x 10~(-10) to 9.7 x 10~(-10) m~2 were suitable conditions for the development of the Iwodake thermal activity.
机译：日本萨摩市岩岛的岩岳岳火山的热活动的特征是山顶火山口的火山气体主要排放，而高地温区的热量则从山顶火山口到山腰分布广泛。在这项研究中，表面温度分布是通过使用红外热像仪的航空勘测获得的，以估算从地面到大气的热通量。在山顶和山腰处，高地温区域的放热率分别为22兆瓦和84兆瓦。较早的研究表明，火山口处的火山岩是岩浆成因的，排放速率为400 kg / s，脱气深度非常浅。据认为，岩岳岳火山的除气活动已经持续了800多年。浅层连续的主动脱气可能导致火山内热液系统的发育，因为从岩浆顶部到表面上升的排气口的火山气体扩散到周围地层。扩散的火山气体会产生广泛的表面温度异常。使用数值模拟研究了这种水热系统的开发。结果证实岩脱岳火山的整体热活动，即山顶火山口喷出的火山气，山腰处分布广泛的地温异常以及沿海岸的温泉可能是由脱气活动形成的。控制广泛的热液系统的重要因素是火山大厦的渗透性和脱气深度。模拟表明，脱气深度在地表以下300至500 m，山体的渗透率在7 x 10〜（-14）以上，排气孔的渗透率在3.8 x 10〜（-10）至9.7 x 10〜（-10） m〜2是开展Iwodake热活性的合适条件。

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