Determination and application of path duration of seismic ground motions based on the K-NET data in Sagami Bay, Japan

IF 1.2 4区 地球科学 Q3 Earth and Planetary Sciences
Shiyang Chen , Xiaojun Li , Lei Fu , Su Chen
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引用次数: 0

Abstract

Duration models are one of the important parameters in ground-motion simulations. This model varies in different study areas, and plays a critical role in nonlinear structural response analysis. Currently, available empirical models are being globally used in ground-motion simulations, with limited research focusing on path duration in specific regions. In this study, we collected 6,486 sets of three-component strong-motion records from 29 K-NET stations in the Sagami Bay, Japan, and its surrounding areas between January 2000 to October 2018. We extracted the effective duration of 386 pieces of ground-motion records by manually picking up the S-wave arrival time and calculating the significant duration. We then obtained the path duration model of the study area based on the empirical equation of dynamic corner frequency and source duration of [7]. Compared with the results of the available empirical models, the Fourier spectrum of the simulated ground motion from our effective duration model showed higher accuracy in the long-term range, with less fitting residuals. This path duration model was then applied to simulate two earthquakes of MW5.4 and MW6.2, respectively, in the region using the stochastic finite-fault method with a set of reliable source, path, and site parameters determined for the study area. The simulation results of most stations fit well with observation records in the 0–30 Hz frequency band. For the MW5.4 earthquake, the simulated ground motions at KNG005/KNG010/SZO008 stations were relatively weak in the mid to high frequency band (1–30 Hz) because the quality factor and geometric diffusion model used in the simulation were the averages of the entire Sagami Bay region, causing a bias in the results of a few stations owing to local crustal velocity anomalies and topographic effects. For the MW6.2 earthquake, the simulated ground motions were relatively weak at all SZO and TKY stations, mainly because of the close distance from these stations to the epicenter and the complex seismic-wave propagation paths. The analysis suggests that the differences between the simulation results of the two earthquakes were mainly related to complex geological conditions and seismic-wave propagation paths.

基于K-NET资料的日本相模湾地震地面运动路径时长的确定与应用
持续时间模型是地震动模拟的重要参数之一。该模型在不同的研究领域存在差异,在非线性结构响应分析中具有重要作用。目前,全球范围内的地面运动模拟均采用现有的经验模型,但对特定区域路径持续时间的研究有限。在这项研究中,我们收集了2000年1月至2018年10月期间日本相模湾及其周边地区29个K-NET站的6486组三分量强震记录。通过人工提取s波到达时间并计算有效持续时间,提取了386条地震动记录的有效持续时间。然后根据[7]的动态角频率和源持续时间的经验方程,得到研究区域的路径持续时间模型。与现有经验模型的结果相比,有效持续时间模型模拟的地面运动傅立叶谱在长期范围内具有更高的精度,拟合残差较小。利用该路径持续时间模型,利用随机有限断层法模拟了该地区的两次MW5.4和MW6.2级地震,并为研究区确定了一组可靠的震源、路径和场址参数。大部分台站的模拟结果与0 ~ 30 Hz波段的观测记录吻合较好。对于MW5.4地震,KNG005/KNG010/SZO008台站模拟的地面运动在中高频(1 ~ 30 Hz)范围内相对较弱,因为模拟中使用的质量因子和几何扩散模型是整个相模湾地区的平均值,少数台站由于局部地壳速度异常和地形影响,模拟结果存在偏差。对于MW6.2级地震,SZO和TKY台站模拟的地面运动相对较弱,这主要是由于SZO和TKY台站距离震中较近,地震波传播路径复杂。分析认为,两次地震模拟结果的差异主要与复杂的地质条件和地震波传播路径有关。
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来源期刊
Earthquake Science
Earthquake Science GEOCHEMISTRY & GEOPHYSICS-
CiteScore
1.10
自引率
8.30%
发文量
42
审稿时长
3 months
期刊介绍: Earthquake Science (EQS) aims to publish high-quality, original, peer-reviewed articles on earthquake-related research subjects. It is an English international journal sponsored by the Seismological Society of China and the Institute of Geophysics, China Earthquake Administration. The topics include, but not limited to, the following ● Seismic sources of all kinds. ● Earth structure at all scales. ● Seismotectonics. ● New methods and theoretical seismology. ● Strong ground motion. ● Seismic phenomena of all kinds. ● Seismic hazards, earthquake forecasting and prediction. ● Seismic instrumentation. ● Significant recent or past seismic events. ● Documentation of recent seismic events or important observations. ● Descriptions of field deployments, new methods, and available software tools. The types of manuscripts include the following. There is no length requirement, except for the Short Notes. 【Articles】 Original contributions that have not been published elsewhere. 【Short Notes】 Short papers of recent events or topics that warrant rapid peer reviews and publications. Limited to 4 publication pages. 【Rapid Communications】 Significant contributions that warrant rapid peer reviews and publications. 【Review Articles】Review articles are by invitation only. Please contact the editorial office and editors for possible proposals. 【Toolboxes】 Descriptions of novel numerical methods and associated computer codes. 【Data Products】 Documentation of datasets of various kinds that are interested to the community and available for open access (field data, processed data, synthetic data, or models). 【Opinions】Views on important topics and future directions in earthquake science. 【Comments and Replies】Commentaries on a recently published EQS paper is welcome. The authors of the paper commented will be invited to reply. Both the Comment and the Reply are subject to peer review.
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