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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Satellite thermal analysis of the 1986 Izu-Oshima lava flows
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Satellite thermal analysis of the 1986 Izu-Oshima lava flows

机译：1986年伊豆大岛熔岩流的卫星热分析

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摘要

Surface temperatures of the eruption products and fumaroles associated with the 1986 eruption of Izu-Oshima volcano, Japan, were analysed using Landsat Thematic Mapper (TM) imagery acquired between about one and eight months after eruption cessation. Field observations and video footage of the eruption assisted the analysis. Throughout the post-eruptive period studied, the eruptive products showed elevated radiance in the TM thermal infrared channel (band 6; 10.4-12.5 μm), equating to pixel-integrated temperatures of 6-48℃. The TM shortwave infrared channels (band 5; 1.55-1.75 μm and band 7; 2.08-2.35 μm) are sensitive just to higher temperature objects, and thermal signatures were found only at the fumarolic areas where temperatures estimated with the 'dual band' method were a maximum of 700-800℃. In TM band 6, a systematic surface temperature difference (which decreased with time after the eruption) was observed between two clastogenic lava flows (LB Ⅰ and LB Ⅲ) that erupted at shortly spaced intervals on 21 November 1986 (16:20-22:00 h local time). Potential reasons for this temperature difference are explored, with the conclusion that the cause is difference in the explosivity (which relates to fountaining height and degrees of magma fragmentation) of the two fire fountains, rather than differences in magmatic flow temperature, surface structure or any non-volcanic factor. Explosivity was greater for the fire-fountain feeding LB Ⅲ than LB Ⅰ, thereby causing a more extensive heat loss during the airborne passage of the LB Ⅲ fragments due to their, on average, more fragmented nature and longer flight times. Thus the temperature of the hot core of the LB Ⅰ flow remained higher than that of LB Ⅲ, and this was reflected in the surface temperature of the upper clinker of the flow when imaged by Landsat TM.
机译：使用1986年日本伊豆大岛火山喷发后与喷发停止后约1至8个月获得的Landsat Thematic Mapper（TM）图像分析了与1986年日本伊豆大岛火山喷发有关的喷发产品和喷气孔的表面温度。现场观察和喷发的录像带有助于分析。在整个喷发后期研究中，喷发产物在TM热红外通道（波段6； 10.4-12.5μm）中显示出较高的辐射度，相当于6-48℃的像素积分温度。 TM短波红外通道（波段5； 1.55-1.75μm和波段7； 2.08-2.35μm）仅对高温物体敏感，并且仅在使用“双波段”方法估算温度的富马地区发现热信号。最高温度为700-800℃。在TM带6中，在1986年11月21日（16：20-22：16）之间以短间隔喷发的两个成岩熔岩流（LBⅠ和LBⅢ）之间观察到了系统的表面温差（随喷发时间而降低）。当地时间00小时）。探究了造成这种温差的潜在原因，得出的结论是，原因是两个消防喷泉的爆炸性差异（与喷泉高度和岩浆破碎程度有关），而不是岩浆流动温度，表面结构或任何其他形式的差异。非火山因素。 LBⅢ型火喷泉的爆炸性比LBⅠ型大，因此，由于LBⅢ碎片的平均散乱性和飞行时间较长，因此在LBⅢ碎片通过空气时会造成更大的热量损失。因此，LBⅠ流的热芯温度仍然高于LBⅢ，这在Landsat TM成像时反映在该流的上部熟料的表面温度上。

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