江苏-南黄海地区地壳地震速度和泊松比的空间变化:对地震构造的影响

IF 1.6 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Journal of Seismology Pub Date : 2024-02-05 DOI:10.1007/s10950-024-10192-w
Yicheng He, Fajun Miao, Jiangrong Zheng, Qiguang Zhao, Jun Wang, Feng Zhu, Jinyan Wang, Xiaoping Fan
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引用次数: 0

摘要

江苏-南黄海地区位于东亚大陆边缘,地处华南和华北交界处。是中国东部地震高发区之一。为加深对灾害性地震与地球物质地球物理性质之间关系的理解,我们对过去 20 年的 P 波和 S 波的走时数据进行了反演,对地震速度(VP 和 Vs)和泊松比(σ)的三维分布进行了成像。结果表明,速度和泊松比与研究区域内的主要地质构造一致。特别是 5、10 和 15 千米深处上地壳的速度模型。我们发现,在整个研究区域内,过去几十年间发生的 M5+ 地震中有 70% ± 7.2% 是在 VP 层析成像边缘区(TEZ)发生的。此外,与江南造山带相比,近岸海域 M5+ 地震的分布模式表现出显著差异。在近岸海域,约 66.7%±8% 的 M5+ 地震发生在速度和泊松比地震剖面带(TEZ)。武南沙隆起带存在相对较低的速度和较高的泊松比异常,表明可能存在流体。这些地震的触发机制很可能是热液的存在,以及受太平洋板块和菲律宾海板块俯冲以及印度板块和欧亚板块碰撞的影响,原有的走向滑动断层被重新激活。相反,在江南造山带,M5+地震主要发生在高速和低泊松比扰动区。造成地震构造特征差异的主要因素可能是流体含量的变化。我们推断,江南造山带震源区附近的岩石基质可能更干燥、更脆,具有更高的机械强度。
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Spatial variation of crustal seismic velocity and Poisson’s ratio in the Jiangsu-South Yellow Sea area: Implication for seismotectonics

The Jiangsu-South Yellow Sea area is located on the East Asian Continental Margin and at the junction of South and North China. It is one of the high seismicity areas in eastern China. To enhance our understanding of the relationship between disastrous earthquakes and the geophysical properties of Earth materials, P- and S-wave travel-time data over the past 20 years are inverted to image the 3D distributions of seismic velocity (VP and Vs) and Poisson’s ratio (σ). The results show that the velocity and Poisson’s ratio demonstrate congruence with the prominent geological formations present within the study area. Specifically, the velocity models for the upper crust at depths of 5, 10, and 15 km. We found that within the total study area, 70% ± 7.2% of M5+ earthquakes that occurred during the past decades initiated in the VP tomographic edge zones (TEZ). Moreover, the distribution patterns of M5+ earthquakes in the offshore sea region exhibit significant differences when compared to those in the Jiangnan Orogenic Belt. In the offshore sea region, about 66.7% ± 8% of M5+ earthquakes initiated in the velocity and Poisson’s ratio TEZ. The presence of comparatively low Vs and high Poisson’s ratio anomalies in the Wunansha Uplift suggest the potential existence of fluids. The triggering mechanism for these earthquakes can likely be ascribed to the presence of hydrothermal fluids and the reactivation of preexisting strike-slip faults, influenced by the subduction of the Pacific and Philippine Sea Plates, as well as the collision between the India and Eurasia Plates. In contrast, within the Jiangnan Orogenic Belt, M5+ earthquakes predominantly initiated in the high-velocity and low Poisson’s ratio perturbation zones. The primary factor contributing to seismotectonic features disparities are likely the variation in fluid content. We infer the rock matrix in the vicinity of the source region of the Jiangnan Orogenic Belt is presumed to be drier, more brittle, and possess greater mechanical strength.

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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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