Correction to: Geosci. Lett. (2018) 5:4 https://doi.org/10.1186/s40562-018-0103-1

After publication of the article (Tian et al. 2018), it has been brought to our attention that the date included in the caption of Figure 3 is incorrect. The caption states that the photographs were taken on “July 20, 2013” but they were in fact taken on “Sept 30, 2015”.