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PurposeThis paper explores ontological assumptions of disasters and introduces some concepts from Chinese disaster scholarship. The authors suggest an approach to explore and engage with different ontologies of disaster without direct comparison, that can further interdisciplinary and cross-cultural collaboration.Design/methodology/approachBy reviewing the academic literature and focussing on two recent key translational texts by Chinese scholars, the authors show what can be revealed about ontology and the potential influence on thinking about human-environment interactions and disaster risk reduction (DRR) policy.FindingsIn Chinese disaster studies, the goal of a "harmonious human-environment relationship" is a foundational concept. There is a clear hierarchical and ontological distinction between humans and the natural ecological system viewed as an integrated whole, with underlying rules that can be discovered by scientific research to enable management of a harmonious relationship.Practical implicationsThe authors suggest a practical way to begin with the following questions: What is the societal goal/aim? What is nature? What is society? How do these interact to create disasters? And what are the implications for DRR research and practice? The authors also demonstrate the importance of probing and understanding the underlying ontologies that are the foundation for theory, which in turn is the foundation for policy and action.Originality/valueIdentification of ontological differences in interdisciplinary and cross-cultural research collaborations and working across these boundaries is challenging and rarely questioned. Yet, as demonstrated here, considering ontological assumptions of the causes of disaster, within and across cultures and disciplines, is essential for collaboration and further research.

Abstract. Landslides triggered by large earthquakes in mountainous regions contribute significantly to overall earthquake losses and pose a major secondary hazard that can persist for months or years. While scientific investigations of coseismic landsliding are increasingly common, there is no protocol for rapid (hours-to-days) humanitarian-facing landslide assessment and no published recognition of what is possible and what is useful to compile immediately after the event. Drawing on the 2015 Mw 7.8 Gorkha earthquake in Nepal, we consider how quickly a landslide assessment based upon manual satellite-based emergency mapping (SEM) can be realistically achieved and review the decisions taken by analysts to ascertain the timeliness and type of useful information that can be generated. We find that, at present, many forms of landslide assessment are too slow to generate relative to the speed of a humanitarian response, despite increasingly rapid access to high-quality imagery. Importantly, the value of information on landslides evolves rapidly as a disaster response develops, so identifying the purpose, timescales, and end users of a post-earthquake landslide assessment is essential to inform the approach taken. It is clear that discussions are needed on the form and timing of landslide assessments, and how best to present and share this information, before rather than after an earthquake strikes. In this paper, we share the lessons learned from the Gorkha earthquake, with the aim of informing the approach taken by scientists to understand the evolving landslide hazard in future events and the expectations of the humanitarian community involved in disaster response.