IF 1 Q3 GEOCHEMISTRY & GEOPHYSICS
E. E. Kozlovskyy, V. Maksymchuk, D. Malytskyi, V. Tymoschuk, O. Hrytsai, N. Pyrizhok
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引用次数: 0

摘要

本工作的目的是研究乌克兰-外喀尔巴阡山脉Oash断层和外喀尔巴阡断层交界带的地震构造特征。研究方法结合了对研究区域地质构造、地震、地貌和大地测量数据的复杂分析。为了澄清局部地震震源的坐标和深度,我们采用了震源规范的方法,使用计算的地震学速度图和运动学校正。地质和地球物理数据,特别是区域剖面数据,被用来将地震事件与特定的地质结构联系起来。据证实,在研究区东北部40-52公里深处记录了许多地震事件。它们与Transcarpathian凹陷地壳(0-27km深)中震源的传统深层定位同时发生,包括研究区域西南部Transcarpathia凹陷前新近纪基底(2-3km深)的逆冲沉积地层/顶板底部深处。由于这些地震在空间上局限于通过地表地质和地貌数据追踪到的跨喀尔巴阡深断层带的东北部,它们表明跨喀尔巴阡槽的地壳结构在褶皱喀尔巴提亚山脉的推力下向这个方向俯冲。这一点也可以从更大(15-30公里)深度的跨喀尔巴阡深断层交叉口地震震源带的相应斜坡中得到证明。这些和当地地震构造的其他特征反映了乌克兰喀尔巴阡山脉所谓的“鳄鱼”构造。这些特征包括浅层(0-12km)地震震源带的反向西南斜坡,以及研究发震带中喀尔巴阡山脉的起伏特征。它们完全符合该地区“高山”和“地形”地球动力学的特征,即分别在东北方向和东部方向上的压缩和位移。这项研究首次确定了乌克兰外喀尔巴阡山脉地壳中存在相对较深(30-55公里)的地震活动——在外喀尔巴阡山脉和Oash深断层交界处喀尔巴提亚山脉下莫霍边界的俯冲带。此外,根据该地区的“高山”、地体和软岩地球动力学的组合,给出了其存在的地球动力学和构造物理理由。考虑到Oash和Transcarpathian断层交界带的地震构造特征,将有助于澄清对自然地质生态空间分布特征和特性的评估,特别是乌克兰Transcarpathians中部的地震构造风险和危害。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
GEODYNAMICS
The purpose of the work is to study the features of seismotectonics of the junction zone of the Oash and Transcarpathian faults in the Ukrainian Transcarpathians. The research methodology combines a complex analysis of geological-tectonic, seismological, geomorphological and geodetic data on the studied area. For the clarification of coordinates and depths of local earthquake foci we applied methods of their hypocenters specification, using a calculated seismological hodograph and kinematic corrections. Geological and geophysical data, in particular on regional profiles, were used to link seismic events to specific geological structures. It was established that a number of seismic events were recorded at depths of 40-52 km in the studied zone, in its northeastern part. They occurred simultaneously with traditional deep localization of seismic sources in the crust of the Transcarpathian depression (0-27 km deep), including at the depths of the sole of thrust sedimentary strata / roof of the pre-Neogene basement of the Transcarpathian depression (2-3 km deep) in the southwestern part of the studied area. Since these earthquakes are spatially localized to the northeast of the zone where the Transcarpathian deep fault is traced by geological and geomorphological data on the surface, they indicate the subduction of the crustal structures of the Transcarpathian trough in this direction under the thrusts of the Folded Carpathians. This is also evidenced by the corresponding slope of the seismofocal zone at the intersection of the Transcarpathian Deep Fault at greater (15-30 km) depths. These and other features of local seismotectonics reflect the so-called "crocodile" tectonics in the Ukrainian Carpathians. The features encompass the reverse, south-west slope of the seismofocal zone at shallower (0-12 km) depths, as well as the features of the relief of the Carpathians in the studied seismogenic zone. They fully correspond to the characteristics of the "alpine" and "terrain" geodynamics of the region, i.e. compression and displacement in the northeastern and eastern directions, respectively. For the first time, the research established the presence of relatively deeper (30-55 km) seismic activity in the earth's crust of the Ukrainian Transcarpathians – in the zone of subduction of the Moho border under the Carpathians in the area of junction of the Transcarpathian and Oash deep faults. Additionally, the geodynamic and tectonophysical justification for its presence was given in terms of combination of "alpine", terrane and asthenolitic geodynamics of the region. Taking into account the features of seismotectonics of the Oash and Transcarpathian faults junction zone will contribute to clarifying the assessment of the characteristics and peculiarities of the spatial distribution of natural geoecological, in particular, seismotectonic risks and hazards in the central part of the Ukrainian Transcarpathians.
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来源期刊
Geodynamics
Geodynamics GEOCHEMISTRY & GEOPHYSICS-
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