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Seismic site classification based on H/V spectral ratio from strong ground motion records: the urban areas of Bursa province 基于强地面运动记录的 H/V 频谱比的地震带分类:布尔萨省的城市地区
IF 1.6 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Pub Date : 2024-03-15 DOI: 10.1007/s10950-024-10206-7
Kaan Hakan Coban

It is known that the site classifications are closely related to the damages caused by earthquakes in areas with increased seismic hazard. Additionally, another important parameter utilized to identify the damage is the Peak Ground Acceleration (PGA) value. While measurements and the GMPE are utilized to identify PGA values, site classification is usually conducted by using the Vs30 value. This study aims to identify the site classifications for Bursa province by using a different approach, namely, the H/V spectral ratio method based on the dominant periods. In this regard, 205 records belonging to 82 earthquakes recorded by 41 strong ground motion stations located in Bursa province were utilized. A mean H/V spectral ratio curve was developed for each station based on the Fourier and response spectra of these earthquake records. Generally, double or multiple peaks resulting from the site structure were observed in the H/V curves. Furthermore, for the station locations, the evaluations were conducted in accordance with the site classifications per the dominant period as it is suggested in the literature. The stations were identified as all of the site classifications suggested by (Zhao et al. Bull Seismol Soc Am 96:914–925, 2006), as SC-1, 2, 3 and 5 suggested by (Fukushima et al. J Earthquake Eng 11:712–724, 2007) and as CL I, II, III, IV and VII suggested by (Di Alessandro et al. Bull Seismol Soc Am 102:680–695, 2012). Additionally, various Spectral Acceleration estimations were made with different GMPE equations for scenario earthquakes, and the results were compared with the design spectra suggested by the Turkish Building Earthquake Code (TBEC 2018). As a result of the study, the H/V spectral curves were generated according to both Fourier and response spectra; using a great number of earthquake data, the hazard was assessed by the soil dominant period-based for the first time in Bursa province.

摘要 众所周知,在地震危险增加的地区,场地分类与地震造成的破坏密切相关。此外,地表加速度峰值(PGA)也是用于确定破坏程度的另一个重要参数。虽然测量和 GMPE 可用于识别 PGA 值,但场地分类通常是通过 Vs30 值进行的。本研究旨在使用一种不同的方法,即基于主要周期的 H/V 频谱比方法,确定布尔萨省的场地分类。为此,研究人员利用了位于布尔萨省的 41 个强地动台站记录的 82 次地震的 205 条记录。根据这些地震记录的傅立叶频谱和响应频谱,为每个台站绘制了一条平均 H/V 频谱比曲线。一般来说,H/V 曲线中会出现由站点结构引起的双峰或多峰。此外,对台站位置的评估是按照文献中建议的主要周期进行的。这些台站被确定为(Zhao 等,Bull Seismol Soc Am 96:914-925, 2006)建议的所有台站分类,(Fukushima 等,J Earthquake Eng 11:712-724, 2007)建议的 SC-1、2、3 和 5,以及(Di Alessandro 等,Bull Seismol Soc Am 102:680-695, 2012)建议的 CL I、II、III、IV 和 VII。此外,还采用不同的 GMPE 公式对情景地震进行了各种频谱加速度估算,并将结果与《土耳其建筑抗震规范》(TBEC 2018)建议的设计频谱进行了比较。研究结果显示,根据傅立叶频谱和响应频谱生成了 H/V 频谱曲线;利用大量地震数据,首次在布尔萨省通过基于土壤主导周期的方法评估了灾害。
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引用次数: 0
Acknowledgement of Reviewers for 2023 鸣谢 2023 年审查员
IF 1.6 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Pub Date : 2024-03-12 DOI: 10.1007/s10950-024-10202-x
Mariano García-Fernández
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引用次数: 0
The influence of earthquake source complexity on frequency-dependent radiation patterns by modifying distance-dependent properties 通过改变与距离相关的特性,研究震源复杂性对频率相关辐射模式的影响
IF 1.6 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Pub Date : 2024-03-09 DOI: 10.1007/s10950-024-10200-z
Hongpeng Zhao, Dengke He, Jiulong Cheng

The double-couple model of the earthquake source has been proven remarkably successful in explaining the radiation pattern in the low-frequency wavefield. However, the radiation pattern is distorted in the high-frequency wavefield. The frequency dependence of the radiation pattern is often interpreted as the path effects. The impact of earthquake sources on radiation patterns is uncertain. In our study, based on the fact that P waves vibrate along the radial direction and S waves vibrate along the transverse direction, the path effects modified model of radiation pattern is proposed based on the optimal ratio coefficient by measuring radial-to-transverse spectral ratios at multiple frequency ranges. Then, we found that the correlation coefficient decreases with the increase of frequency but remains stable with the increase of distance. This means the complexity of the earthquake source can distort the wavefield at higher frequencies and drive variability in the ground motion.

事实证明,地震源的双耦合模型在解释低频波场的辐射模式方面非常成功。然而,辐射模式在高频波场中却被扭曲了。辐射模式的频率依赖性通常被解释为路径效应。地震源对辐射模式的影响尚不确定。在我们的研究中,基于 P 波沿径向振动、S 波沿横向振动的事实,通过测量多个频率范围内的径向与横向频谱比,提出了基于最佳比值系数的路径效应修正辐射模式模型。然后,我们发现相关系数随频率的增加而减小,但随距离的增加而保持稳定。这说明地震源的复杂性会扭曲较高频率的波场,导致地面运动的变化。
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引用次数: 0
The 2022 Goesan earthquake of the moment magnitude 3.8 along the buried fault in the central Korean Peninsula 2022 年朝鲜半岛中部埋藏断层沿线发生的鹅山 3.8 级瞬间地震
IF 1.6 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Pub Date : 2024-03-06 DOI: 10.1007/s10950-024-10201-y
Hobin Lim, Chang Soo Cho, Minkyung Son

On October 28, 2022, a moment magnitude (Mw) 3.8 earthquake occurred in Goesan, South Korea, typically characterized as a stable continental region. Herein, we analyze 42 earthquakes, including the Mw 3.8 earthquake, the largest foreshock (Mw 3.3), which preceded the mainshock by 17 s, and the largest aftershock (Mw 2.9). The primary aim of this study is to identify interactions among the seismic events. To this end, we utilized the permanent seismic networks with the closest station at 8.3 km from the epicenter, and the temporary network deployed eight hours after the mainshock’s occurrence. Relocation results delineate that the mainshock occurred at the southeastern tip of the hypocenter distribution of three foreshocks, trending west-northwest–east-southeast. The aftershocks form an overall spatially diffused seismic pattern that propagates toward both ends of the inferred lineament in the downdip direction. The rupture directivity of the mainshock, along with waveform similarity across the mainshock and foreshocks, confirms the inferred geometry, corresponding well with the focal mechanisms of the mainshock and the largest foreshock. We demonstrate that the change in Coulomb failure stress (ΔCFS) by the largest foreshock was positive where the mainshock occurred and that the mainshock generated ΔCFS capable of triggering the propagation of the aftershocks.

摘要 2022 年 10 月 28 日,韩国槐山地区发生了矩震级 (Mw) 3.8 级地震,该地区是典型的稳定大陆地区。在此,我们分析了 42 次地震,包括 Mw 3.8 地震、比主震早 17 秒的最大前震(Mw 3.3)和最大余震(Mw 2.9)。本研究的主要目的是确定地震事件之间的相互作用。为此,我们使用了永久性地震台网(最近的台站距离震中 8.3 公里)和在主震发生 8 小时后部署的临时台网。定位结果表明,主震发生在三个前震的次中心分布的东南端,呈西北-东南-东南偏西走向。余震形成了一个整体的空间扩散地震模式,沿着下倾方向向推断线状的两端传播。主震的破裂指向性以及主震和前震的波形相似性证实了推断的几何形状,与主震和最大前震的聚焦机制十分吻合。我们证明,在主震发生的地方,最大前震引起的库仑破坏应力(ΔCFS)变化为正值,主震产生的ΔCFS能够触发余震的传播。
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引用次数: 0
Seismic magnitude homogenization by unified regression method and its effect on seismicity parameters 统一回归法的震级均质化及其对地震参数的影响
IF 1.6 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Pub Date : 2024-03-01 DOI: 10.1007/s10950-024-10197-5
Rohit Singh Patel, Ajay Kumar Sinha

A homogeneous earthquake catalogue is necessary to conduct a thorough seismological investigation and improve seismic hazard assessment. Therefore, the present study intends to determine the influence of magnitude homogenization based on different regression methods on the seismicity parameters. The earthquake catalog of the Bihar, India region has been used for the study. An events data catalogue consisting of 4001 events has been compiled over the period 1911–2023. The data is primarily sourced from international and local databases have been assembled to provide a comprehensive overview of seismic activity within the study area. Empirical relationships have been derived between moment magnitude and commonly used local and global magnitude scales by performing non-linear regressions using chi-square regression method (CSQ) and ordinary least-square regression method (OLS). Measurement error for both dependent and independent variables of various data sets was calculated for the CSQ process. In order to address the non-linear nature of the correlations, we used curvilinear models, namely, the exponential model (EXP), which was recently introduced by the authors of the global catalogue supported by the global earthquake model (GEM) foundation. The use of CSQ method reduces the bias created by OLS method for defining the nonlinearity of the relationship. Seismicity parameters, including the magnitude of completeness (Mc) and a and b values of the Gutenberg-Richter recurrence model, have been calculated for homogenised undeclustered and declustered catalogue spanning five specific time periods. Declustering has been performed to isolate the foreshocks and aftershocks from the mainshocks. The observed changes in the Mc and b values are found to be dependent on the introduction of more recent data over time. The study area has been divided into eight seismogenic zones based on the geographic variations in earthquake occurrence and the prevailing tectonic conditions. The estimation of Mc, b, and a values has been conducted for each zone, and the analysis has been performed to examine the variations in these parameters. Derived equations serve as valuable tools for assessing and analysing seismic hazards in the north India and the central Himalayas region.

要进行全面的地震学调查和改进地震灾害评估,就必须有一个同质的地震目录。因此,本研究旨在确定基于不同回归方法的震级同质化对地震参数的影响。本研究使用了印度比哈尔地区的地震目录。地震事件数据目录包括 1911-2023 年间的 4001 次地震事件。这些数据主要来源于国际和本地数据库,已汇集成研究区域内地震活动的综合概览。通过使用卡方回归法(CSQ)和普通最小二乘法(OLS)进行非线性回归,得出了矩震级与常用的地方和全球震级标度之间的经验关系。在 CSQ 过程中,计算了不同数据集的因变量和自变量的测量误差。为了解决相关性的非线性问题,我们使用了曲线模型,即指数模型(EXP),该模型是最近由全球地震模型(GEM)基础支持的全球目录的作者提出的。CSQ 方法的使用减少了 OLS 方法在定义非线性关系时产生的偏差。地震参数,包括完整度大小(Mc)以及古腾堡-里克特复发模型的 a 值和 b 值,已针对跨越五个特定时间段的同质化无聚类和去聚类目录进行了计算。去聚类是为了将前震和余震从主震中分离出来。观测到的 Mc 值和 b 值的变化取决于随着时间推移引入的最新数据。根据地震发生的地理差异和当时的构造条件,将研究区域划分为八个地震带。对每个地震带的 Mc、b 和 a 值进行了估算,并对这些参数的变化进行了分析。推导出的方程可作为评估和分析印度北部和喜马拉雅山中部地区地震灾害的宝贵工具。
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引用次数: 0
Identification of trends in the Tancítaro-Parícutin seismic swarm sequence through fractal characteristics of inter-event times 通过事件间时间的分形特征确定 Tancítaro-Parícutin 地震群序列的趋势
IF 1.6 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Pub Date : 2024-02-29 DOI: 10.1007/s10950-024-10198-4
A. T. Mendoza-Rosas, C. A. Juárez-Valle, A. Figueroa-Soto, P. Corona-Chávez, D. A. Gómez-Calderón, A. Mendoza-Ponce

Seismic swarms in a volcanic field can be indicators of the movements of volcanic activity and stagnant magma in the Earth’s crust. In the Tancítaro-Parícutin volcanic region, to the west of the Michoacán-Guanajuato volcanic field in Mexico, at least six seismic swarms have occurred in the last 25 years. However, greater precision is still required due to the distance between and non-permanence of the seismic stations. We used data from a broadband station of the Earth Sciences Research Institute (INICIT-UMSNH) and records from Mexican National Seismological Service (SSN), Center for Geosciences (UNAM) and Mexican National Center for Prevention of Disasters (CENAPRED) to relocate and obtain focal mechanisms for four selected seismic events. We applied the fractal methodology to analyze the inter-event times of the seismic swarm sequences. Two well-defined swarm sequences were identified, and, subsequently, the fractal behavior of the logarithm of inter-event times was analyzed by means of the Hurst and Holder exponent. Our goal was the identification of the different dynamical stages acting during the seismic swarm generation processes, that seem to be related to the stress transfer in different seismogenic faults. By means of the b-values and the temporal evolution of the Hurst exponent, at least five different stages can be distinguished during the Tancítaro-Parícutin seismic swarms. These stages appear to be determined by dynamic changes in the seismic sequence, also indicated by the focal mechanisms whose fits with faults that were apparently activated during the seismic swarm. The Tancítaro-Parícutin seismic swarm processes indeed show multi-fractal behavior, which may be related to different stages in the diffusion process.

摘要 火山区的地震群可以作为地壳中火山活动和停滞岩浆运动的指标。在墨西哥米却肯-瓜纳华托火山区西部的 Tancítaro-Parícutin 火山区,过去 25 年中至少发生了六次地震群。然而,由于地震台站之间的距离和非永久性,仍然需要更高的精度。我们利用地球科学研究所(INICIT-UMSNH)宽带台站的数据,以及墨西哥国家地震局(SSN)、墨西哥国立自治大学(UNAM)地球科学中心和墨西哥国家防灾中心(CENAPRED)的记录,重新定位并获取了四次选定地震事件的焦点机制。我们采用分形方法分析了地震群序列的间隔时间。我们确定了两个定义明确的震群序列,随后通过赫斯特指数和霍尔德指数分析了事件间时间对数的分形行为。我们的目标是识别地震群产生过程中的不同动力学阶段,这些阶段似乎与不同地震断层中的应力传递有关。通过 b 值和赫斯特指数的时间演变,可以在 Tancítaro-Parícutin 地震震群期间区分出至少五个不同阶段。这些阶段似乎是由地震序列的动态变化所决定的,也可以从与地震群期间明显被激活的断层相吻合的聚焦机制中看出。Tancítaro-Parícutin地震群过程确实表现出多分形行为,这可能与扩散过程的不同阶段有关。
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引用次数: 0
Crustal structure of Khorasan, NE Iran, using Rayleigh wave tomography 利用瑞利波断层扫描分析伊朗东北部呼罗珊的地壳结构
IF 1.6 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Pub Date : 2024-02-27 DOI: 10.1007/s10950-024-10199-3
Maryam Rezaei Moghadam, Taghi Shirzad, Mohsen Kazemnia, Irfan Ullah

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.

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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引用次数: 0
Spatial and temporal variation of seismic b-values across the West Tehran 德黑兰西部地震 b 值的时空变化
IF 1.6 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Pub Date : 2024-02-09 DOI: 10.1007/s10950-024-10196-6
Mehrzad Azizi, Hamid Saffari

Until now, numerous efforts have been made to find earthquake precursors. One of the factors that can predict the occurrence of future earthquakes is a decrease in the b-value parameter. In this study, for the metropolis of Tehran, with a population of over 8 million, located on or near many active faults, it is estimated that if the maximum seismic potential of these faults happened again, the greatest disaster in human history would occur. In this case, the analyses indicate a minimum of several hundred thousand casualties and sometimes more than a million. In the current study, various faults around Tehran were investigated, and given that the faults on Tehran have not had serious seismic activity for over a thousand years, this article focused exclusively on adjacent faults, particularly the Eshtehard faults. Therefore, in the current study, the seismicity and tectonics of western Tehran were investigated by analyzing seismic parameters using earthquake data collected from 2003 to 2023. In general, the investigation of the temporal changes in the study area showed that the b-value decreased before the December 20, 2017, earthquake and an increasing trend afterward. Observing anomalies in the b-value before and after the main movement in the area shows that changes in this parameter can be considered a precursor for estimating the time and location of earthquakes. Therefore, a useful step can be taken toward knowing the local seismic hazards by using earthquake data recorded by seismic networks and continuously monitoring the changes in the b-value.

摘要 迄今为止,人们一直在努力寻找地震前兆。b 值参数的降低是预测未来地震发生的因素之一。在这项研究中,对于人口超过 800 万、位于许多活动断层上或其附近的大都市德黑兰,据估计,如果这些断层的最大地震潜能再次发生,将会发生人类历史上最大的灾难。在这种情况下,分析表明至少会造成几十万人的伤亡,有时甚至会超过一百万人。在本次研究中,对德黑兰周围的各种断层进行了调查,鉴于德黑兰的断层已经有一千多年没有发生过严重的地震活动,本文只关注邻近的断层,特别是 Eshtehard 断层。因此,在本研究中,通过使用 2003 年至 2023 年收集的地震数据分析地震参数,对德黑兰西部的地震活动和构造进行了研究。总体而言,对研究区域时间变化的调查显示,2017 年 12 月 20 日地震之前,b 值下降,之后呈上升趋势。观察该地区主要运动前后 b 值的异常情况表明,该参数的变化可被视为估计地震发生时间和地点的前兆。因此,利用地震台网记录的地震数据,持续监测 b 值的变化,可以为了解当地地震灾害迈出有益的一步。
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引用次数: 0
Regionally adjusted stochastic earthquake ground motion models, associated variabilities and epistemic uncertainties 经区域调整的随机地震地动模型、相关变异性和认识不确定性
IF 1.6 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Pub Date : 2024-02-08 DOI: 10.1007/s10950-024-10195-7
Jaleena Sunny, Marco de Angelis, Benjamin Edwards

An optimisation-based calibration technique, using the area metric, is applied to determine the input parameters of a stochastic earthquake-waveform simulation method. The calibration algorithm updates a model prior, specifically an estimate of a region’s seismological (source, path and site) parameters, typically developed using waveform data, or existing models, from a wide range of sources. In the absence of calibration, this can result in overestimates of a target region’s ground motion variability, and in some cases, introduce biases. The proposed method simultaneously attains optimum estimates of median, range and distribution (uncertainty) of these seismological parameters, and resultant ground motions, for a specific target region, through calibration of physically constrained parametric models to local ground motion data. We apply the method to Italy, a region of moderate seismicity, using response spectra recorded in the European Strong Motion (ESM) dataset. As a prior, we utilise independent seismological models developed using strong motion data across a wider European context. The calibration obtains values of each seismological parameter considered (such as, but not limited to, quality factor, geometrical spreading and stress drop), to develop a suite of optimal parameters for locally adjusted stochastic ground motion simulation. We consider both the epistemic and aleatory variability associated with the calibration process. We were able to reduce the area metric (misfit) value by up to 88% for the simulations using updated parameters, compared to the initial prior. This framework for the calibration and updating of seismological models can help achieve robust and transparent regionally adjusted estimates of ground motion, and to consider epistemic uncertainty through correlated parameters.

摘要 采用基于优化的校准技术,利用面积度量确定随机地震波形模拟方法的输入参数。校准算法更新了模型先验,特别是对区域地震学(震源、路径和地点)参数的估计,通常是利用波形数据或现有模型从各种来源开发的。在没有校准的情况下,这会导致对目标区域地动变化的高估,在某些情况下还会引入偏差。所提出的方法通过将物理约束参数模型与当地地动数据进行校准,可同时获得这些地震参数的中值、范围和分布(不确定性)的最佳估计值,以及特定目标区域的地动结果。我们利用欧洲强震(ESM)数据集记录的反应谱,将该方法应用于意大利这一中等地震频发地区。作为先验数据,我们利用在更广泛的欧洲范围内使用强震数据开发的独立地震学模型。校准可获得每个地震学参数(如但不限于质量因子、几何扩展和应力下降)的值,从而为局部调整的随机地动模拟开发出一套最佳参数。我们考虑了与校准过程相关的认识变异性和已知变异性。与初始先验值相比,我们能够将使用更新参数进行模拟的面积度量(不拟合)值减少高达 88%。这种校准和更新地震学模型的框架有助于实现稳健、透明的地动区域调整估计,并通过相关参数考虑认识上的不确定性。
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引用次数: 0
Techniques to identify microtremor wave contributions and impact to seismic site characterization 确定微震波贡献及其对地震遗址特征描述影响的技术
IF 1.6 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Pub Date : 2024-02-07 DOI: 10.1007/s10950-024-10189-5
Hema Sharma, Sheri Molnar, Aamna Sirohey

We investigate whether varying wavefield contributions are the likely cause to variation in microtremor horizontal-to-vertical spectral ratio (MHVSR) amplification shape between six sites in the relatively homogeneous geologic setting of Windsor, Ontario. We quantify the MHVSR shape in terms of peak broadness and its fitness using mathematical functions to identify potential wave type contributions. We develop a technique that uses particle motion plots of cross-correlated microtremor recordings to establish the dominant wave types contributing to the microtremor wavefield within three important frequency bandwidths (below, spanning, and above the fundamental peak frequency). We investigate the variability in the inverted shear-wave velocity (VS) depth profile by performing 21 MHVSR inversions with varying Rayleigh, Love, and body wave contributions. The impact to seismic site characterization is that the depth and VS of the resonator (half-space) layer are overestimated consistently by an average of 28% compared to the often-default-assumed Rayleigh ellipticity forward amplification model. Our study demonstrates the importance of correctly identifying wave type contributions of the microtremor wavefield for the proper estimation of VS depth profiles, especially to obtain correct thickness of the sediment layer and resonator VS and thereby the average VS of the upper 30 m (VS30).

我们研究了在安大略省温莎相对均匀的地质环境中,不同波场贡献是否是导致六个站点之间微震波水平垂直谱比(MHVSR)放大形状变化的可能原因。我们从峰值宽度的角度量化了 MHVSR 的形状,并使用数学函数确定潜在的波型贡献。我们开发了一种技术,利用交叉相关微震颤记录的质点运动图来确定在三个重要频率带宽(低于、跨越和高于基峰值频率)内对微震颤波场有贡献的主要波型。我们通过对不同的瑞利波、洛夫波和体波贡献进行 21 次 MHVSR 反演,研究了反演剪切波速度(VS)深度剖面的变化。与通常默认的瑞利椭圆度正向放大模型相比,共振层(半空间)的深度和剪切波速度(VS)被平均高估了 28%,这对地震现场特征描述产生了影响。我们的研究表明,要正确估算 VS 深度剖面,尤其是要获得沉积层和共振 VS 的正确厚度,进而获得上层 30 米的平均 VS(VS30),就必须正确识别微震波场的波型贡献。
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Journal of Seismology
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