Using Sentinel-1A/B SAR data, Harvey (2021) produced an InSAR timeseries over White Island, New Zealand. The paper documents the apparent deformation through 2019, with particular focus on the mechanisms surrounding the fatal eruption on December 9 of that year. Based on the analysis, the author suggests that a sudden increase in the Line of Sight (LOS) range occurred two weeks prior to the eruption, with potential implications for hazard monitoring at White Island and globally equivalent volcanoes. More generally, a suggestion is made that dome contraction may presage eruptions. However, re-analysis of the datasets provided by the author indicates that the sudden change in LOS displacement, interpreted as a collapse of the dome, is simply an atmospheric artefact introduced by the choice of reference point on the island. Given the fatal nature of the eruption, and implications for forecasting phreatic eruptions more broadly, it is vitally important that the community carefully validate results that have forecasting implications, otherwise, spurious warnings may be communicated to the public. Based on the data presented in Harvey (2021), there is clearly no precursory deflation event in the build up to the eruption, in agreement with other datasets around this tragic event.

Harvey（2021）使用Sentinel-1A / B SAR数据，在新西兰白岛上产生了InSAR时间序列。该论文记录了直到2019年的明显变形，特别关注了当年12月9日致命喷发的机制。根据分析，作者建议在喷发前两周视线（LOS）范围突然增大，这可能对白岛和全球同等火山的危害监测产生潜在影响。更普遍地，有人提出穹顶收缩可能预示着爆发。然而，对作者提供的数据集的重新分析表明，LOS位移的突然变化（被解释为穹顶的塌陷）仅仅是由于岛上参考点的选择而引入的大气伪影。考虑到喷发的致命性质以及更广泛地预测潜水爆发的意义，至关重要的是，社区必须仔细验证具有预测意义的结果，否则，可能将虚假警告传达给公众。根据Harvey（2021）中提供的数据，与这次悲剧事件周围的其他数据集相一致，在火山爆发形成过程中显然没有先兆通缩事件。