GEODYNAMICS

IF 1 Q3 GEOCHEMISTRY & GEOPHYSICS Geodynamics Pub Date : 2021-06-29 DOI:10.23939/jgd2021.01.058
S. Verbytskyi, B. Kuplovskyi, V. Prokopyshyn, O. Stetskiv, I. Nishchimenko, T. Brych, O. Kruk
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Abstract

Objective. To refine seismic hazard parameters by registering high-frequency microseisms within the site under reconstruction in connection with the land plot enlargement of a plant intended for electronic components manufacturing. To quantify the estimated intensity of seismic shakings (in MSK-64 scale scores) accounting for the effects associated with local engineering and geological conditions at the study site. Methods. Seismic microzonation practical works at construction sites implies the application of short-period microseism registration method, which is considered to be one of the most efficient and unbiased instrumental SMZ methods when the field seismological studies are to be performed in a short period of time. The method relies on comparing parameters of soil micro-vibrations generated by natural and anthropogenic sources at the studied and the reference sites. At that, the soil is regarded as a filter capable of modifying the amplitude and phase oscillation spectra of seismic waves hitting the sedimentary cover basement. The seismic intensity gains were determined by comparing the amplitudes of soil oscillations at registration points over several sections of the site and at a reference point. Microseisms were recorded by using two identical three-channel digital seismic stations DAS-05 being the newest ones out of the model series of automatic seismic stations developed at S. I. Subbotin Institute of Geophysics of the NAS of Ukraine. VEGIK seismometers were used as seismometers. Results. Microseismic oscillation recording analysis has revealed that the main contribution to the formation of a wave field is due to the urban background disturbances falling within the frequency range of f = 8.0 - 18.0 Hz, as well as low-frequency natural oceanic effects amounting to f = 0.4 - 8.0 Hz while high-frequency vibrations are caused by anthropogenic factors amounting to f = 18.0 - 27.0 Hz (Fig. 3). Data of synchronous 24-hour microseism registering have indicated a sufficiently high stability of the amplitude level and frequency composition of microseismic oscillations, which suggests that the microseismic processes approximate stationary ones, provided that non-stationary events are removed from records. Plots of seismic intensity gain values at different frequencies caused by soil conditions at the studied site, determined according to the relation of averaged microseismic amplitude spectra both at the studied and reference site, are shown in Fig. 4. The average estimates of seismic intensity gains in the frequency range of 0.1 - 20.0 Hz for the construction site soil conditions, calculated with respect to microseismic spectral densities per all three vibration components, are presented in Table 1. The seismic intensity gain in relation to the initial (background) one for the engineering and geological conditions of the site equals to ΔIr = -0.21. Scientific novelty. Given the amplitude ratio and amplitude spectra of microseisms recorded at different sites and at the reference point, refined parameters of seismic hazards for the developable site have been obtained with consideration of the local soil conditions effects. Evaluation ratings of seismic shaking calculated intensity (in MSK-64 scale scores) based on effects associated with the local engineering and geological conditions of the study site have been provided. Practical significance. Construction site SMZ yields updated values of seismic forces relative to the general seismic zonation of the country, which allows taking into account possible gain in seismic severity at the design stage of earthquake-proof construction. Consideration of SMZ results at construction of engineering structures prevents human casualties and reduces economic losses in case of seismic manifestations.
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地球动力学
目标。通过记录与电子元件制造工厂用地扩大有关的重建场地内的高频微地震,来细化地震危险参数。考虑到研究地点当地工程和地质条件的影响,量化地震震动的估计强度(以MSK-64量表评分)。方法。在建筑工地的地震微区划实际工作中,需要应用短周期微震配准方法,该方法被认为是短时间内进行野外地震研究时最有效、最公正的仪器SMZ方法之一。该方法依赖于在研究点和参考点比较自然和人为源引起的土壤微振动参数。在这种情况下,土壤被认为是一个过滤器,能够改变撞击沉积层基底的地震波的振幅和相位振荡谱。地震烈度增益是通过比较场地若干部分的登记点和参考点的土壤振动幅度来确定的。微地震是用两个相同的三通道数字地震台站DAS-05记录的,DAS-05是乌克兰国家科学院地球物理研究所研制的自动地震台站模型系列中最新的一个。地震检波器采用VEGIK地震仪。结果。微震振荡记录分析表明,波场的形成主要是由于f = 8.0 ~ 18.0 Hz频率范围内的城市背景扰动。以及f = 0.4 - 8.0 Hz的低频自然海洋效应,而f = 18.0 - 27.0 Hz的高频振动是人为因素引起的(图3)。24小时同步微震记录数据表明,微震振荡的幅度水平和频率组成具有足够高的稳定性,这表明微震过程近似于平稳过程。只要从记录中删除非平稳事件。根据研究点与参考点平均微震振幅谱关系确定的研究点土壤条件在不同频率下的地震烈度增益值图如图4所示。在0.1 - 20.0 Hz的频率范围内,建筑工地土壤条件下的地震强度增益的平均估计,是根据每三个振动分量的微地震频谱密度计算的,见表1。根据场地的工程和地质条件,地震烈度增益相对于初始(背景)烈度增益等于ΔIr = -0.21。科学的新奇。根据不同地点和参考点记录的微震振幅比和振幅谱,考虑当地土壤条件的影响,得到了可开发地点的精细地震危险性参数。根据研究场地当地工程和地质条件的影响,给出了地震震动计算烈度的评价等级(MSK-64评分)。现实意义。建筑工地SMZ提供了相对于该国一般地震带的地震力的更新值,这使得在抗震建筑的设计阶段考虑到地震严重程度的可能增加。在工程结构施工中考虑SMZ结果,在地震表现下可以防止人员伤亡,减少经济损失。
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Geodynamics
Geodynamics GEOCHEMISTRY & GEOPHYSICS-
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GEODYNAMICS GEODYNAMICS GEODYNAMICS GEODYNAMICS GEODYNAMICS
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