The temporal evolution of effusion rate is the main controlling factor of lava spreading and emplacement conditions. Therefore, it represents the most relevant parameter for characterizing the dynamics of effusive eruptions and thus for assessing the volcanic hazard associated with this type of volcanism. Since the effusion rate curves can provide important insights into the properties of the magma feeding system, several efforts have been performed for their classification and interpretation. Here, a recently published numerical model is employed for studying the effects of magma source and feeding dike properties on the main characteristics (e.g., duration, erupted mass, and effusion rate trend) of small‐volume effusive eruptions, in the absence of syn‐eruptive magma injection from deeper storages. We show that the total erupted mass is mainly controlled by magma reservoir conditions (i.e., dimensions and overpressure) prior to the eruption, whereas conduit processes along with reservoir properties can significantly affect mean effusion rate, and thus, they dramatically influence eruption duration. Simulations reproduce a wide variety of effusion rate trends, whose occurrence is controlled by the complex competition between conduit enlargement and overpressure decrease due to magma withdrawal. These effusion rate curves were classified in four groups, which were associated with the different types described in the literature. Results agree with the traditional explanation of effusion rate curves and provide new insights for interpreting them, highlighting the importance of magma reservoir size, initial overpressure, and initial width of the feeding dike in controlling the nature of the resulting effusion rate curve.

中文翻译：

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小体积玄武岩喷发期间的喷发速率演变：来自数值模型的见解

积水速率的时间演变是熔岩扩散和沉积条件的主要控制因素。因此，它代表了最相关的参数，用于表征喷发的动力学，从而评估与此类火山活动有关的火山灾害。由于渗出速率曲线可以为岩浆供给系统的性质提供重要的见识，因此已经对其分类和解释进行了一些努力。在这里，最近发布的一个数值模型被用来研究岩浆源和进水堤防特性对小体积积水喷发的主要特征（例如持续时间，喷发质量和积水率趋势）的影响，而没有合成油藏。从更深的储层喷出岩浆。我们表明，喷发前的总喷发质量主要受岩浆储集层条件（即尺寸和超压）控制，而导管过程以及储集层特性会显着影响平均渗出速率，因此，它们会极大地影响喷发持续时间。模拟重现了各种各样的积水率趋势，这些变化的发生受到导管增大和由于岩浆撤回而导致的超压下降之间复杂竞争的控制。这些渗出率曲线分为四组，分别与文献中描述的不同类型相关。结果与传统的积水率曲线解释相符，并为解释它们提供了新的见解，突出了岩浆储层大小，初始超压，