Active tectonics in long-lived orogenic belts usually manifests on the preexisting inherited structures. In the Kvarner region of the External Dinarides, an area with low-to-moderate seismicity related to the Adriatic microplate (Adria) northward movement, we deal with faults in predominantly carbonate rocks within tectonically complex NW-SE striking-and-thrust belt, which makes the identification and parametrization of the active structures challenging. Moreover, anthropogenic modifications greatly complicate access to the surface geological and geomorphological data. This paper demonstrates results of focused multidisciplinary research, from surface geological mapping and offshore shallow seismic surveys to earthquake focal mechanisms, as an active fault identification and parametrization kit, with a final goal to produce an across-methodological integrated model of the identified features in the future. Reverse, normal, and strike-slip orogen-parallel (longitudinal) to transverse faults were identified during geological mapping, but there is no clear evidence of their mutual relations and possible recent activity. The focal mechanisms calculated from the instrumental record include weak-to-moderate earthquakes and show solutions for all faulting types in the upper crust, compatible with the NE-SW oriented principal stress direction, with the stronger events favoring reverse and strike-slip faulting. The 3D spatial and temporal distribution of recent earthquake hypocenters indicate their clustering along predominantly subvertical transversal and steeply NE-dipping longitudinal planes. High-resolution shallow seismic geoacoustical survey (subbottom profiler) of the Quaternary sediments in the Rijeka Bay revealed local tectonic deformations of the stratified Late Pleistocene deposits that, along with overlaying mass-transport deposits, could imply prehistorical strong earthquake effects. Neotectonic faults onshore are tentatively recognized as highly fractured zones characterized by enhanced weathering, but there is no evidence for its recent activity. Thus, it seems that the active faults are blind and situated below the thin-skinned and highly deformed early-orogenic tectonic cover of the Adria. A strain accumulating deeper in the crust is probably irregularly redistributed near the surface along the preexisting fault network formed during the earlier phases of the Dinaric orogenesis. The results indicate a need for further multidisciplinary research that will contribute to a better seismic hazard assessment in the densely populated region that is also covered by strategic infrastructure.

长寿命造山带中的活跃构造通常表现在预先存在的继承构造上。在外部迪纳里德斯的Kvarner地区，这是与亚得里亚微板块（Adria）向北运动有关的低度至中度地震活动区，我们处理的是构造复杂的NW-SE冲冲带中主要为碳酸盐岩的断层，这使有源结构的识别和参数化具有挑战性。此外，人为改变极大地增加了获取地表地质和地貌数据的难度。本文展示了集中的多学科研究成果，从地面地质测绘和海上浅层地震勘测到地震震源机制，作为主动断层识别和参数化套件，最终目标是在将来生成所识别特征的跨方法集成模型。在地质制图过程中，确定了与横向断层的反向，正常和走滑造山带平行（纵向），但是没有明确的证据表明它们相互关系和可能的近期活动。根据仪器记录计算出的震源机制包括弱至中度地震，并显示了上地壳所有断层类型的解，与NE-SW定向主应力方向兼容，较强的事件有利于逆向和走滑断层。最近地震震源的3D时空分布表明，它们沿主要是垂直下的横向和陡峭的NE浸入纵向平面聚集。里耶卡湾第四纪沉积物的高分辨率浅层地震地声调查（地下剖面仪）揭示了分层的晚更新世沉积物的局部构造变形，以及覆盖的大量输运沉积物，可能暗示了史前强烈的地震作用。陆上的新构造断层暂时被认为是高度断裂的带，其特征是风化作用增强，但没有证据表明其近期活动。因此，活动断裂似乎是盲目的，并位于阿德里亚的薄皮且高度变形的早造山构造盖层之下。积聚在地壳深处的应变可能沿着二叠纪造山运动早期阶段形成的既有断层网络不规则地重新分布在地表附近。