Natural hazard-triggered technological accidents (Natechs) refer to accidents involving releases of hazardous materials (hazmat) triggered by natural hazards. Huge economic losses, as well as human health and environmental problems are caused by Natechs. In this regard, learning from previous Natechs is critical for risk management. However, due to data scarcity and high uncertainty concerning such hazards, it becomes a serious challenge for risk managers to detect Natechs from large databases, such as the National Response Center (NRC) database. As the largest database of hazmat release incidents, the NRC database receives hazmat release reports from citizens in the United States. However, callers often have incomplete details about the incidents they are reporting. This results in many records having incomplete information. Consequently, it is quite difficult to identify and extract Natechs accurately and efficiently. In this study, we introduce machine learning theory into the Natech retrieving research, and a Semi-Intelligent Natech Identification Framework (SINIF) is proposed in order to solve the problem. We tested the suitability of two supervised machine learning algorithms, namely the Long Short-Term Memory (LSTM) and the Convolutional Neural Network (CNN), and selected the former for the development of the SINIF. According to the results, the SINIF is efficient (a total number of 826,078 records were analyzed) and accurate (the accuracy is over 0.90), while 32,841 Natech reports between 1990 and 2017 were extracted from the NRC database. Furthermore, the majority of those Natech reports (97.85%) were related to meteorological phenomena, with hurricanes (24.41%), heavy rains (19.27%), and storms (18.29%) as the main causes of these reported Natechs. Overall, this study suggests that risk managers can benefit immensely from SINIF in analyzing Natech data from large databases efficiently.

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Disaster risk communicators have long contemplated the significance of sociodemographic dimensions in better understanding and characterising an audience's perceptions. Indeed, various societal and personal factors have been considered as predictors of individual risk attitudes, perceptions and behaviours for an array of hazard types. However, such risk communication issues have only recently started to be explored within the emerging field of conjoint natural and technological disasters, called Natech. In this context, delineating the sociodemographic profile of individuals and appreciating the implications of these aspects on Natech risk communication can assist risk managers in tailoring effective risk communication strategies. This study investigates, among other items, the effects of residents' gender, age, household size, income and educational level on their perceptions of information disclosure concerning Natech risk. The approach draws upon the framework of the Situational Theory of Problem Solving in an attempt to conceptualise the complex issue of information deficiency. Taking into account individuals' situational perception elements, the research focuses on certain cross-situational, sociodemographic features that serve as external, determining factors that shape their problem-solving motivation. Data has been collected from households near industrial parks in Osaka and Kobe in Japan and Yeosu, Suncheon, Gwangyang and Ulsan in S. Korea. The results of our regression analysis indicated mostly weak and insignificant effects, except for gender and age that suggested negative and positive influences to individuals' communicative attitudes, respectively. The implications of the institutional differences between the two countries are also discussed within the sphere of chemical and Natech risk communication.

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