Geometrical properties of seismicity in California
Geometrical properties of seismicity in California
复制标题
加利福尼亚州地震活动的几何特性
DOI：
10.1093/gji/ggac189
复制
发表时间：
2022
影响因子：
2.8
通讯作者：
Zaliapin, Ilya
中科院分区：
文献类型：
--
作者：
Ross, Zachary E.;Ben-Zion, Yehuda;Zaliapin, Ilya
地震活动的空间几何学编码了关于加载和破坏过程的信息，以及底层断层结构的属性。传统的方法来表征地震活动性的几何属性依赖于假定的位置和断层表面的几何形状，特别是在深度，分辨率总体上相当差。在这项研究中，我们开发了另一种方法来量化地震活动性的几何特性，从各向异性点过程理论的技术。我们的方法不需要事先了解潜在的故障属性。我们描述了加州32个不同地震活动区的几何属性，并介绍了一个简单的四类分类方案，涵盖了所观察到的几何属性的范围。大多数被归类为具有局部地震活动的地区位于北方加州，而几乎所有被归类为具有分布式地震活动的地区都位于南加州。此外，我们发现，大约有1的4个地区表现出正交的地震活动结构。这项研究的结果提供了一个基础，为未来的地震活动的几何特性和新的可观测的分析，以比较与数值模拟研究。
The spatial geometry of seismicity encodes information about loading and failure processes, as well as properties of the underlying fault structure. Traditional approaches to characterizing geometrical attributes of seismicity rely on assumed locations and geometry of fault surfaces, particularly at depth, where resolution is overall quite poor. In this study, we develop an alternative approach to quantifying geometrical properties of seismicity using techniques from anisotropic point process theory. Our approach does not require prior knowledge about the underlying fault properties. We characterize the geometrical attributes of 32 distinct seismicity regions in California and introduce a simple four class classification scheme that covers the range of geometrical properties observed. Most of the regions classified as having localized seismicity are within northern California, while nearly all of the regions classified as having distributed seismicity are within southern California. In addition, we find that roughly 1 out of 4 regions exhibit orthogonal seismicity structures. The results of this study provide a foundation for future analyses of geometrical properties of seismicity and new observables to compare with numerical modelling studies.