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首页> 外文期刊>International journal of remote sensing >Thermal Remote Sensing Of The Low-intensity Carbonatite Volcanism Of Oldoinyo Lengai, Tanzania
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Thermal Remote Sensing Of The Low-intensity Carbonatite Volcanism Of Oldoinyo Lengai, Tanzania

机译：坦桑尼亚Oldoinyo Lengai低强度碳酸盐岩火山岩的热遥感

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Although Tanzania, Kenya and Ethiopia contain a number of active and potentially hazardous volcanoes, none of them are routinely or continuously monitored. Of these, Tanzania's Oldoinyo Lengai (OL) has been active almost continuously over the past two decades (since 1983). Recent activity has been confined to small-scale effusive and explosive eruptions of natrocarbonatite within the summit crater, with lava flows occasionally overflowing the crater rim and extending onto the volcano flanks. The automated MODVOLC algorithm falls short of detecting all thermal anomalies within OL's crater. The sensitivity of the algorithm is insufficient to detect anomalies of the size and magnitude presented by those at OL. We explore how Moderate Resolution Imaging Spectroradiometer (MODIS) infrared (IR) bands can still be used to monitor activity. We cross-verify our observations against field reports and higher resolution satellite images (ASTER, Landsat ETM + ). Despite the limited extent and low temperature (～585℃) of natrocarbonatite lavas, relative variations in eruption intensity and periods of increased activity alternating with periods of reduced or no detectable activity can be observed using the MODLEN algorithm. Although activity in the past two decades has been moderate at OL, a more intense explosive eruption is overdue and there is a need for routine monitoring in the future. Our work makes a case for low-cost thermal IR monitoring as an essential component of such a monitoring programme at several Tanzanian, Kenyan and Ethiopian volcanoes. The approach presented here is already available for routine use.
机译：尽管坦桑尼亚，肯尼亚和埃塞俄比亚有许多活火山和潜在危险的火山，但没有对它们进行常规或连续监测。其中，坦桑尼亚的Oldoinyo Lengai（OL）在过去的20年中（自1983年以来）几乎一直活跃。最近的活动仅限于在山顶火山口内发生的小规模喷出和爆炸性的纳碳酸盐喷发，熔岩流偶尔会溢出火山口边缘，并延伸到火山侧面。自动化MODVOLC算法无法检测OL火山口内的所有热异常。该算法的敏感性不足以检测OL所呈现的大小和大小异常。我们探索中分辨率成像光谱仪（MODIS）红外（IR）波段如何仍可用于监视活动。我们对照实地报告和更高分辨率的卫星图像（ASTER，Landsat ETM +）对我们的观察结果进行交叉验证。尽管碳酸钠岩熔岩的程度有限且温度较低（约585℃），但使用MODLEN算法可以观察到喷发强度和活动度增加的相对变化，以及活动时间减少或无法检测到的变化。尽管在过去的20年中，OL的活动较为温和，但更强烈的爆炸性喷发早该发生，将来有必要进行常规监视。我们的工作为在多个坦桑尼亚，肯尼亚和埃塞俄比亚火山进行此类监测计划的必要组成部分提供了低成本热红外监测的依据。这里介绍的方法已经可以常规使用。

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