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首页> 外文期刊>Journal of geodynamics >Late Cenozoic stress states around the Bolu Basin along the North Anatolian Fault, NW Turkey
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Late Cenozoic stress states around the Bolu Basin along the North Anatolian Fault, NW Turkey

机译：土耳其西北安纳托利亚断裂带北部博卢盆地周围的新生代晚期应力状态

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摘要

This study defines the Late Cenozoic stress regimes acting around the Bolu Basin along the North Anatolian Fault in northwestern Turkey. The inferred regional stress regime, obtained from the inversion of measured fault-slip vectors as well as focal mechanism solutions, is significant and induces the right-lateral displacement of the North Anatolian Fault. The field observations have also revealed extensional structures in and around the Bolu Basin. These extensional structures can be interpreted as either a local effect of the regional transtensional stress regime or as the result of the interaction of the fault geometries of the dextral Duzce Fault and the southern escarpment of the North Anatolian Fault, bordering the Bolu Basin in the north and in the south, respectively. The inversion of slip vectors measured on fault planes indicates that a strike-slip stress regime with consistent NW- and NE-trending σ_H_(max) (σ_1) and σ_H_(min) (σ_3) axes is dominant. Stress ratio (R) values provided by inversion of slip vectors measured on both major and minor faults and field observations show significant variations of principal stress magnitudes within the strike-slip stress regime resulting in older transpression to younger transtension. These two stress states, producing dextral displacement along NAF, are coaxial with a consistent NE-trending σ_3 axis. The earthquake focal mechanism inversions confirm that the transtensional stress regime has continued into recent times, having identical horizontal stress axis directions, characterized by NW and NE-trending σ_1 and σ_3 axes, respectively. A locally consistent NE-trending extensional, normal faulting regime is also seen in the Bolu Basin. The stress-tensor change within the strike-slip stress regime can be explained by variations in horizontal stress magnitudes that probably occurred in Quaternary times as a result of the westward extrusion of the Anatolian block.
机译：这项研究确定了在土耳其西北部北安纳托利亚断层的博卢盆地周围作用的新生代晚期应力体制。从测得的断层滑动矢量的反演以及震源机制解中得出的推断区域应力状态很重要，并引起了北安那托利亚断层的右移。现场观察还发现了博卢盆地及其周围地区的伸展构造。这些伸展结构可以解释为区域性张应力作用的局部效应，也可以解释为右旋杜兹切斯断层的断层几何形状与北安纳托利亚断层的南部悬崖（与北部博卢盆地接壤）的相互作用的结果。和南部。在断层平面上测得的滑动矢量的反演表明，具有一致的NW向和NE向σ_H_（max）（σ_1）和σ_H_（min）（σ_3）轴的走滑应力状态占主导地位。在主要和次要断层上测得的滑动矢量的反演提供的应力比（R）值，以及现场观测结果表明，走滑滑动应力范围内的主应力幅值存在显着变化，从而导致从旧压降向年轻压降。沿NAF产生右移的这两个应力状态与一致的NE趋势σ_3轴同轴。地震震源机制反演证实了张应力状态一直持续到最近，具有相同的水平应力轴方向，分别以西北和东北走向为σ_1和σ_3轴为特征。在博卢盆地也看到了局部一致的东北走向的伸展，正常断层状态。走滑应力状态下的应力张量变化可以通过水平应力幅值的变化来解释，该水平应力幅值可能是由于安那托利亚块体向西挤压而在第四纪发生的。

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