Crustal structure of Khorasan, NE Iran, using Rayleigh wave tomography

IF 1.6 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS
Maryam Rezaei Moghadam, Taghi Shirzad, Mohsen Kazemnia, Irfan Ullah
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Abstract

The tomography results reveal not only distinct velocity structures in different tectonic zones but can also provide valuable insights into the geological features of the area. This study presents the results of 2D Rayleigh wave tomographic maps obtained in NE Iran. For this purpose, we used the recorded waveforms of more than 500 earthquakes with M > 4 that occurred between January 2000 and October 2020 at 165 stations. The calculated tomographic maps cover a period range of 3 to 36 s, providing the 3D VS model to analyze crustal structure at depths ranging from 2 to 30 km. At shorter periods, the tomographic maps are primarily influenced by sediment thickness, with the presence of thick sediment layers (~ 10 km) responsible for the observed low VS anomalies (< 3.1 km/s) in the study area. At longer periods, the tomographic maps highlight the structural characteristics of the middle-lower crustal layers and, somewhere, the depth variations of the Moho discontinuity. The VS model also confirms the correlation between tectonic fractures and known faults in the study area as boundaries of seismotectonic provinces. Moreover, a distinct area was observed beneath the Binalud foreland, which we interpreted as a suture zone, as suggested by previous studies. The reliability of the resolved anomalies was supported through a series of tests, including checkerboard and earthquake location uncertainties. These tests demonstrated the robustness of the results and provided confidence in the accuracy of the findings.

Abstract Image

利用瑞利波断层扫描分析伊朗东北部呼罗珊的地壳结构
摘要 层析成像结果不仅揭示了不同构造带的不同速度结构,还能为了解该地区的地质特征提供有价值的信息。本研究介绍了在伊朗东北部获得的二维瑞利波层析成像图结果。为此,我们使用了 2000 年 1 月至 2020 年 10 月期间在 165 个站点发生的 500 多次 M > 4 地震的记录波形。计算出的层析成像图覆盖了 3 至 36 秒的周期范围,为分析 2 至 30 千米深度的地壳结构提供了三维 VS 模型。在较短周期内,层析成像图主要受沉积厚度的影响,厚沉积层(约 10 千米)的存在是研究区域观测到低 VS 异常(< 3.1 千米/秒)的原因。在较长的周期内,层析成像图突出显示了中下地壳层的结构特征,并在某处显示了莫霍不连续面的深度变化。VS 模型还证实了研究区内构造断裂与作为地震构造带边界的已知断层之间的相关性。此外,在比纳鲁德前陆下方观察到一个独特的区域,我们将其解释为缝合带,这与之前的研究结果一致。通过一系列测试,包括棋盘测试和地震位置不确定性测试,证明了所解析异常的可靠性。这些测试证明了结果的稳健性,并为研究结果的准确性提供了信心。
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来源期刊
Journal of Seismology
Journal of Seismology 地学-地球化学与地球物理
CiteScore
3.30
自引率
6.20%
发文量
67
审稿时长
3 months
期刊介绍: Journal of Seismology is an international journal specialising in all observational and theoretical aspects related to earthquake occurrence. Research topics may cover: seismotectonics, seismicity, historical seismicity, seismic source physics, strong ground motion studies, seismic hazard or risk, engineering seismology, physics of fault systems, triggered and induced seismicity, mining seismology, volcano seismology, earthquake prediction, structural investigations ranging from local to regional and global studies with a particular focus on passive experiments.
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