Abstract

In this paper, we outline the overview of the problem of intraplate seismicity and summarize our studies aimed at identifying potential earthquake sources in three regions located in continental environments. We study the French Massif Central situated within the West-European platform, the Gujarat area located at the northwestern edge of the Indian shield, and northeast Egypt located in the northeastern part of the African continent. These regions exhibit different levels of seismic activity. The French Massif Central reveals the lowest rate of seismicity, northeast Egypt exposes a low-to-moderate seismicity, and Gujarat reveals moderate seismicity with rare occurrence of strong events. We use a phenomenological approach for identifying possible locations of earthquakes, which is based on the pattern recognition applied to morphostructural data. The approach hypothesizes the nucleation of strong earthquakes at morphostructural nodes forming at the intersections of morphostructural lineaments, which are delineated by morphostructural zoning. Nodes are characterized by the pertinent geophysical and geological parameters, on the basis of which pattern recognition algorithm pinpoints capable nodes, i.e., the nodes where events of a certain sizes may occur. Seismic hazard assessment of continental regions is impeded because their seismic history is normally very pure. In such a situation, information on capable nodes is a necessary input for seismic hazard assessment. The example of northeast Egypt shows the exploiting capable nodes to assess seismic hazard by the Neo-Deterministic Seismic Hazard Assessment Methodology.

中文翻译：

---

识别大陆环境中的潜在地震源

摘要

在本文中，我们概述了板内地震活动问题的概述，并总结了我们旨在识别位于大陆环境中的三个区域的潜在地震源的研究。我们研究了位于西欧平台内的法国中部地块、位于印度盾西北边缘的古吉拉特邦地区和位于非洲大陆东北部的埃及东北部。这些地区表现出不同程度的地震活动。法国地块中部的地震活动率最低，埃及东北部的地震活动为中低度地震活动，古吉拉特邦的地震活动为中度地震活动，很少发生强事件。我们使用现象学方法来识别地震的可能位置，该方法基于应用于形态结构数据的模式识别。该方法假设强地震在形态结构节点处形成，这些节点形成在形态结构线的交叉点上，这些交点由形态结构分区描绘。节点由相关的地球物理和地质参数表征，模式识别算法在此基础上精确定位有能力的节点，即可能发生一定规模事件的节点。大陆地区的地震灾害评估受到阻碍，因为它们的地震历史通常非常纯粹。在这种情况下，有能力节点的信息是地震危险性评估的必要输入。埃及东北部的例子展示了利用新确定性地震灾害评估方法评估地震灾害的能力节点。