The 2011 Great East Japan earthquake and tsunami remind us once again that these types of cascade event can occur and cause considerable damage. The scientific community realizes the need for rapid theoretical and practical progress on cascade events to provide field teams with the necessary tools and information for action during these types of events. The earthquake damage scenario for Martinique and Guadeloupe islands (French West Indies) has already been performed within the framework of French governmental projects, but these areas, in the vicinity of the French West Indies subduction zone, are also subject to tsunami events. In this study, we propose to perform a combined scenario in which an earthquake is followed by a tsunami, as it could arrive one day, considering the seismic characteristics and potential of such a subduction zone. The vulnerability of the buildings is defined considering local specific information based on several years of field inventories and inspections and is later classified into one of the 36 model building types of HAZUS. The calculation of the damages due to tsunamis follows the HAZUS methodologies. The main novelty of our study is the calculation of damage due to the two phenomena occurring one after the other, not in parallel, as is calculated in the existing literature. Therefore, for the calculation of the damages due to the second event (i.e. the tsunami), the vulnerability characteristics of the initial structure are reduced, considering the damage state of the construction after the first event (i.e. the earthquake). Hence, in our case, this calculation approach allows us to update the number of exposed elements and their changed vulnerabilities considering the damages due to the earthquake, since certain structures are already damaged by the earthquake before the arrival of the tsunami wave. The results coming from our study and our manner of treating the cascading hazards are putting into perspective with the Hazus method for combining damages coming from earthquake and the damages coming from consequently tsunami. The results expressed as the sum of the damages in both most damaged states, Extensive and Complete, are more or less in the same range of values for both studies (our study and HAZUS 2017). However, a trend of having more percentage of complete damages (and hence, less the Extensive damages) with our method than the ones obtained with the Hazus combination can be important information for crisis managing. This is a first result for the French West Indies territory, but anyway, more studies should be carried out in order to check this trend and eventually to confirm and validate this issue for others territories with others bathymetries, vulnerabilities and seismological features.

2011年的东日本大地震和海啸再次提醒我们，这些类型的级联事件可能发生并造成相当大的破坏。科学界意识到有必要在级联事件上迅速地进行理论和实践上的进步，以便为现场团队提供在此类事件中采取行动所必需的工具和信息。马提尼克岛和瓜德罗普岛（法属西印度群岛）的地震破坏情景已经在法国政府项目的框架内进行，但这些地区，在法属西印度群岛俯冲带附近，也受到海啸的影响。在这项研究中，我们建议执行一个组合方案，考虑到地震的特征和这种俯冲带的潜能，在地震之后可能会发生海啸。根据几年的现场清单和检查，结合当地的具体信息来定义建筑物的脆弱性，随后将其划分为HAZUS的36种模型建筑类型之一。海啸造成的损害的计算遵循HAZUS方法。我们研究的主要新颖之处在于计算由于两种现象一个接一个地发生而不是同时发生的两种现象所造成的损害，这与现有文献中的计算方法不同。因此，在计算第二次事件（即海啸）造成的破坏时，考虑到第一次事件（即地震）之后建筑物的破坏状态，可以降低初始结构的易损性。因此，就我们而言 这种计算方法使我们可以考虑地震造成的破坏来更新暴露元素的数量及其易变的脆弱性，因为某些结构在海啸到来之前已经被地震破坏了。我们的研究结果以及我们对级联危害的处理方式正以Hazus方法加以考虑，该方法将地震造成的损失与海啸造成的损失相结合。结果表示为两种研究中大多数受损状态（广泛性和完全性）的损害总和或多或少都处于相同的值范围内（我们的研究和HAZUS 2017）。但是，趋势是完全损害的比例更高（因此，用我们的方法获得的损失要小于使用Hazus组合获得的损失，这对于管理危机是重要的信息。这是对法属西印度群岛领土的第一个结果，但是无论如何，应该进行更多的研究，以检查这种趋势，并最终在具有其他水深，脆弱性和地震特征的其他领土上确认和验证该问题。