Characterization of Seismogenic Zones of Romania
Characterization of Seismogenic Zones of Romania
复制标题
罗马尼亚地震带的特征
DOI：
10.1007/pl00001100
复制
发表时间：
2000
影响因子：
2
通讯作者：
A. Utale
中科院分区：
文献类型：
--
作者：
M. Radulian;N. Mândrescu;G. Panza;E. Popescu;A. Utale
摘要：虽然现有地震资料所涵盖的时间和震级范围有限，但在罗马尼亚的发震带中，我们概述了几个重要的区域趋势。弗朗西亚地区是迄今为止地震最活跃的地区，具有持续的中深度地震发生率，聚集在一个非常有限的震源体积中，并且具有明显的压应力状态。从现有的断平面解中推断，地壳的变形场急剧减小，最大震级低于6.5级（保加利亚的Shabla带除外）。喀尔巴阡山脉前深区北西-东南方向发育的主要断裂体系与弗朗切亚的俯冲过程有关，尽管它们似乎没有发挥明显的积极作用，但这是一个积极的俯冲过程。现有资料表明，前深区和喀尔巴阡山脉南部为伸展变形区，而潘诺尼亚坳陷东缘与喀尔巴阡山脉的接触处为主要的挤压变形区，这与地壳应力场的最大水平压缩方向从欧洲西部和中部的NE-SW到喀尔巴阡山脉内部的E-W的弯曲趋势一致（gr<s:1> nthal和Strohmeyer， 1992）。
Abstract—Although the time and magnitude range covered by available seismological data is limited, several significant regional trends are outlined in the seismogenic zones of Romania. Vrancea region, which is by far the most seismically active area, has a persistent rate of occurrence of intermediate-depth earthquakes, clustered in a very confined focal volume, and a clear compressive stress regime. The deformation field, as deduced from the available fault plane solutions, is drastically reduced in the crust, where the maximum magnitude is below 6.5 (except Shabla zone, in Bulgaria). The system of major faults developed in a NW–SE direction in the Carpathians foredeep area is certainly linked to the subduction process in Vrancea, although they seem not to play a significantly active role, as could be expected for an active subduction process. The existing data indicate an extensional deformation regime over the foredeep area and Southern Carpathians, while a predominant compressive regime is outlined at the contact between the eastern margin of the Pannonian Depression and Carpathians orogen, in agreement with the bending tendency of the maximum horizontal compression orientation of the crustal stress field from NE–SW, in western and central Europe, to E–W, in the intra-Carpathian region (Grünthal and Strohmeyer, 1992).