大洋中脊对新谢姆利亚群岛地震的影响

IF 1 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Geotectonics Pub Date : 2024-03-14 DOI:10.1134/s0016852123060031
G. N. Antonovskaya, Ya. V. Konechnaya, I. M. Basakina
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引用次数: 0

摘要

摘要 考虑了大洋中脊(MORs),包括加克尔海脊和克尼波维奇海脊-勒纳海槽系统对新 泽姆利亚群岛地区 1980-2022 年地震活动的影响。针对所考虑的每个地质要素,编制了具有单一统一震级 mbISC 的地震目录以进行等效信息比较,计算了年地震能量,并绘制了各年地震能量分布图。根据埃尔萨塞模型(Elsasser Model)对粘性岩流圈下刚性弹性岩石圈的局部应力传递过程进行了分析建模,并对 MORs 的扰动传播进行了定量计算。在克尼波维奇海脊-勒拿河槽系统和加克尔海脊系统中,莫尔斯扰动到达新泽姆利亚群岛的时间间隔分别为 1-2 年和 3-5 年。MORs的各种地质和构造结构对地震活动水平的最大共同贡献可达到所受扰动的40-60%,这是对新亚泽姆利亚造山带地震活动产生影响的充分条件。确定了地球动力学最活跃的构造和构造应力集中区。
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The Influence of Mid-Oceanic Ridges on the Seismicity of the Novaya Zemlya Archipelago

Abstract

The influence of the mid-oceanic ridges (MORs), including the Gakkel Ridge and the Knipovich Ridge–Lena Trough system on the seismicity of the Novaya Zemlya archipelago area for 1980‒2022 is considered. For each geological element under consideration, seismic catalogs with a single unified magnitude mbISC for an equivalent comparison of information were compiled, the annual seismic energy was calculated, and plots of its distribution by year were constructed. Analytical modeling based on the Elsasser model describing the process of local stress transfer in a rigid elastic lithosphere underlain by a viscous asthenosphere was performed, and quantitative calculations of the disturbance propagations from MORs were made. The time intervals through which disturbances from MORs reach the Novaya Zemlya archipelago are 1‒2 years for the Knipovich Ridge–Lena Trough system and 3‒5 years for the Gakkel Ridge. The maximum joint contribution to the level of seismic activity of various geological and tectonic structures of the MORs can reach 40‒60% of the applied disturbance, which is a sufficient condition for the influence on seismicity of the Novaya Zemlya orogen. The most geodynamically active structures and zones of tectonic stress concentration were identified.

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来源期刊
Geotectonics
Geotectonics 地学-地球化学与地球物理
CiteScore
1.90
自引率
9.10%
发文量
28
审稿时长
3 months
期刊介绍: Geotectonics publishes articles on general and regional tectonics, structural geology, geodynamics, and experimental tectonics and considers the relation of tectonics to the deep structure of the earth, magmatism, metamorphism, and mineral resources.
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