The Interdisciplinary Nature-Induced Disaster Index: Eldgjá, Laki, and How to Evaluate Historical Sources in an Interdisciplinary Framework
Abstract The integration of archives of society with archives of nature has helped scholars to date extreme events precisely. This approach has led to collaboration between the natural sciences and the humanities. While it has helped to highlight the dimensions of nature-induced disasters and their societal consequences, it has often led to rather monocausal explanations, promoting nature as the prime agent in history. The field is currently experiencing a shift away from monocausal explanations. Cultural factors need to be examined as well in order to analyze their contribution to disasters properly. To aid in this endeavor, we introduce the “Interdisciplinary Nature-Induced Disaster index” (INID-index), a tool to successfully integrate historical material into research on natural extreme events and their impacts on past societies. Eldgjá (ca. 934–940 CE) and Laki (1783–1784 CE)—the two major Icelandic eruptions of the Common Era—will be used as case studies to demonstrate the benefits of the index. A third contrasting study on a volcanic event in around 913 CE highlights the desiderata that the index can indicate, and its limitations. We consider this paper an offer to make transparent the questions that historians ask themselves and an example of a way to increase understanding across disciplinary cultures.