Abstract Barren Island, situated in the Andaman Sea, is the northernmost active volcano of the Sunda arc. The oldest known eruption of the volcano was during the period 1787–1832. After about 150 years of quiescence, volcanic activity resumed in 1991 and continues since then. The magmatic plumbing system of this volcano is largely unknown due to lack of geophysical experiments owing to its remote location. We report, for the first-time, time-series surface deformation measurements of Barren Island volcano from interferometric synthetic aperture radar (InSAR) during epochs 2007–2011 and 2015–2017. Line-of-Sight (LOS) deformation of −50 mm/yr during 2007–2011 at the cinder cone is interpreted as the co-eruptive pressure changes associated with the 2008–2010 eruptions. Bayesian inversion suggests a shallow magma reservoir at a depth of 578−100+300 m below the summit. The depth of the magma reservoir is shallower than that of other volcanoes of the Sunda arc, probably due to the extensional stress regime imposed by the oblique subduction. Based on the present studies and previous works, we propose a plausible source model for Barren Island volcano. We also discuss potential biases in the present source parameter estimation due to the lack of high quality InSAR data from both ascending and descending directions. Significant deformation (−15 to −150 mm/yr) observed along the lava delta of Barren Island volcano for both the epochs are interpreted as post-emplacement subsidence of the lava flow. Further, we characterise the lava flow including volcanic deposits by mapping its spatial extent and elevation changes during 1979–2000 and 2000–2017 periods using geodetic measurements.

中文翻译：

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受 InSAR 测量约束的 Barren Island 火山，安达曼海 (2007-2017) 的表面变形：浅层岩浆储层和熔岩场沉降的证据

摘要 荒岛位于安达曼海，是巽他弧最北端的活火山。已知最古老的火山喷发发生在 1787 年至 1832 年期间。在大约 150 年的静止之后，火山活动于 1991 年恢复并从那时起继续。由于地处偏远，缺乏地球物理实验，这座火山的岩浆管道系统在很大程度上是未知的。我们首次报告了 2007-2011 年和 2015-2017 年期间干涉合成孔径雷达 (InSAR) 对 Barren Island 火山的时间序列表面变形测量。2007-2011 年期间，煤渣锥的视线 (LOS) 变形为 -50 毫米/年，被解释为与 2008-2010 年喷发相关的协同喷发压力变化。贝叶斯反演表明在峰顶下方 578-100+300 m 深度存在浅层岩浆储层。岩浆储层的深度比巽他弧的其他火山浅，可能是由于倾斜俯冲施加的拉伸应力状态。基于目前的研究和以往的工作，我们提出了荒岛火山的合理震源模型。由于缺乏来自上升和下降方向的高质量 InSAR 数据，我们还讨论了当前源参数估计中的潜在偏差。两个时期沿 Barren Island 火山熔岩三角洲观察到的显着变形（-15 至 -150 毫米/年）被解释为熔岩流的侵位后沉降。更多，