Tondi Emanuele, Blumetti Anna Maria, Čičak Mišo, Di Manna Pio, Galli Paolo, Invernizzi Chiara, Mazzoli Stefano, Piccardi Luigi, Valentini Giorgio, Vittori Eutizio, Volatili Tiziano
School of Science and Technology, Geology Division, University of Camerino, Camerino, Italy.
National Institute of Geophysics and Volcanology, Roma, Italy.
Sci Rep. 2021 Apr 28;11(1):9150. doi: 10.1038/s41598-021-88378-2.
We provide here a first-hand description of the coseismic surface effects caused by the Mw 6.4 Petrinja earthquake that hit central Croatia on 29 December 2020. This was one of the strongest seismic events that occurred in Croatia in the last two centuries. Field surveys in the epicentral area allowed us to observe and map primary coseismic effects, including geometry and kinematics of surface faulting, as well as secondary effects, such as liquefaction, sinkholes and landslides. The resulting dataset consists of homogeneous georeferenced records identifying 222 observation points, each of which contains a minimum of 5 to a maximum of 14 numeric and string fields of relevant information. The earthquake caused surface faulting defining a typical 'conjugate' fault pattern characterized by Y and X shears, tension cracks (T fractures), and compression structures (P shears) within a ca. 10 km wide (across strike), NW-SE striking right-lateral strike-slip shear zone (i.e., the Petrinja Fault Zone, PFZ). We believe that the results of the field survey provide fundamental information to improve the interpretation of seismological, GPS and InSAR data of this earthquake. Moreover, the data related to the surface faulting may impact future studies focused on earthquake processes in active strike-slip settings, integrating the estimates of slip amount and distribution in assessing the hazard associated with capable transcurrent faults.
我们在此提供了对2020年12月29日袭击克罗地亚中部的Mw 6.4级佩特里尼亚地震同震地表效应的第一手描述。这是过去两个世纪在克罗地亚发生的最强地震事件之一。在震中区域进行的实地调查使我们能够观察并绘制主要的同震效应，包括地表断层的几何形状和运动学，以及诸如液化、塌陷和滑坡等次生效应。所得数据集由标识出222个观测点的同类地理参考记录组成，每个观测点至少包含5个至最多14个相关信息的数值和字符串字段。此次地震造成的地表断层形成了典型的“共轭”断层模式，其特征为在一个宽约10公里（走向方向）、走向为西北-东南的右旋走滑剪切带（即佩特里尼亚断层带，PFZ）内出现Y和X型剪切、张裂缝（T形裂缝）以及挤压构造（P型剪切）。我们认为，实地调查结果为改进对此次地震的地震学、GPS和InSAR数据的解释提供了基础信息。此外，与地表断层相关的数据可能会影响未来聚焦于活动走滑环境中地震过程的研究，在评估与能动平移断层相关的灾害时纳入滑动量和分布的估计。
