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宽频带地震学与中强地震破裂过程的研究 总被引:3,自引:1,他引:3
宽频带地震学是近年来地球物理学科的重要进展之一,现代的观测技术实现了仪器在很宽的频带范围内记录数字地震信号,宽频带资料含有更真实和更全面的震源和地下介质的信息,利用宽频带资料可以对广泛的地球物理问题进行研究,中强地震的破裂过程是一个非常重要的研究课题。利用宽频带地震学的分析手段,可以得到更加精细的破裂图象,未来的十年里,宽频地震学将会是地震学发展的一个主要方向。 相似文献
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第82届SEG年会成果表明:计算机技术和地震装备技术的发展,引领了国际地球物理勘探技术的快速发展;宽方位、宽频带、高密度等采集技术,各向异性逆时偏移、弹性波的全波形反演等处理技术,多波处理与解释、4D地震等技术,很快将成为物探的主导技术.为了更好地把握技术的发展,需要在地震资料处理、解释领域重点开展如下研究:发展宽频带、各向异性、最小二乘、弹性波的逆时偏移技术;层析、逆时偏移角度域道集速度分析、全波形反演的速度估计方法、是进一步提高成像精度重点发展方向.岩石物理是地震解释、储层反演、裂缝检测的基础,重点深化在实验室测量、弹性各向异性的测量、油藏描述和监测方向的研究.全波形反演技术是高精度成像建立速度模型和油藏描述重要手段,在理论上、在应用上仍是下一步发展的重要方向. 相似文献
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为了提高地震台站运行质量,减少零漂超范围对宽频带地震计正常运行的影响,对宽频带地震计零位状态实现了实时监视,并通过微信发送给运维工作人员. 相似文献
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为了研究短周期与宽频带数字地震观测系统的一致性,分别对山东地震台网青岛、济南、荣成、五莲、烟台的5个同一摆墩上安装的两套观测系统记录的同一地震事件波形资料进行了相关性分析。先将宽频带记录通过等波纹带通滤波器进行频带为1~20 Hz的滤波处理,再将短周期记录进行过采样处理,实现与宽频带记录的采样率一致。分析表明,宽频带和短周期地震计记录近震、地方震和非天然近距离地震波形在形态上一致,地震波形的振幅和相位存在较好相似性,震中距越近地震波形振幅和相位的相似度越高,宽频带和短周期地震计得到速度震级间差别不大,一致性较好。 相似文献
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电容式位移传感器具有灵敏度高、分辨力强、能检测10mμ甚至更小的位移,特别适合于宽频带、长周期地震仪的应用。本文是作者为 BSO 井下地震计系统研制的变间隙式电容位移传感器。文中分析了电容传感器的基本原理及其分布参数的影响,介绍提高电容传感器性能的一些措施以及达到的技术指标。 相似文献
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《地震地磁观测与研究》2015,(6)
反馈式地震计的出现在地震计发展历史上具有划时代意义,大动态、宽频带已经成为当代地震观测的主流技术,数字技术应用是地震计的发展方向。采用模拟反馈技术的宽频带地震计存在低频段自噪声高及系统受环境影响大等问题。实验结果显示,通过引入数字反馈技术,可以优化地震计的长周期噪声,提高系统稳定性,首次实现程控配置地震计的周期。 相似文献
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为了提高地震台站运行质量,减少零漂超范围对宽频带地震计正常运行的影响,对宽频带地震计零位状态实现了实时监视,并通过微信发送给运维工作人员。 相似文献
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D. G. Levchenko I. P. Kuzin M. V. Safonov V. N. Sychikov I. V. Ulomov B. V. Kholopov 《Seismic Instruments》2010,46(3):250-264
Development and application of broadband seismic sensors, namely velocimeters of electrochemical type (chemotrons), are considered.
The principle of operation and design of modern electrochemical (molecular-electronic) converters of seismic signals for linear
and rotary motions are described. The data on metrological certification and prolonged trials of these seismic sensors on
test benches are presented. Their advantages as compared to stationary broadband seismic sensors of electrodynamic type lie
in impact immunity, high power supply efficiency, operability at large inclinations and in a wide temperature range. Comparative
analysis of records of the Sichuan Earthquake (China, May 12, 2008) obtained in Moscow on a test bench at the Institute of
Physics of the Earth of the Russian Academy of Sciences with help of an electrodynamic seismic sensor and on a test bench
at the Design Bureau of Oceanological Equipment of the Russian Academy of Sciences with the help of an electrochemical sensor
is presented in conclusion. 相似文献
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I. P. Bashilov S. G. Volosov S. A. Korolyov G. L. Kosarev O. Yu. Riznichenko I. A. Sanina 《Seismic Instruments》2014,50(3):177-191
The SSD-3 three-channel seismic recorder and the ADSS-3 three-component broadband standalone digital seismic station based on the SSD-3 together with SM-3E seismic sensors were developed. The main advantage of this equipment in comparison with foreign and domestic analogs is simplicity and convenience while maintaining high technical characteristics. The structure and operation of the seismic sensor and seismic recorder are considered, and their main technical characteristics are given. Laboratory, bench, and comparative tests of the seismic recorder and station demonstrated their working capacity and compliance with the development goal. Based on the test results, the ADSS-3 seismic station was commissioned as a three-component broadband observation point of the Mikhnevo small-aperture seismic array. The data obtained using the ADSS-3 made is possible to study the structure of the crust and upper mantle of this region using the receiver function method. 相似文献
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西湖凹陷深层致密砂岩储层具有良好的勘探开发前景,受埋深影响,目的层地震资料品质较差.A构造通过斜缆宽频采集和处理获取宽频地震数据,提升了资料品质,然而应用常规子波提取方法对宽频数据进行子波提取并反演计算纵波阻抗,结果与井上实测数值差异较大,影响储层的定量解释.针对这一问题,提出统计性子波和确定性子波相结合的长短子波合并宽频子波提取方法,提取的宽频子波比常规子波低频丰富、旁瓣小,能更真实地反映地震信息,约束稀疏脉冲反演的纵波阻抗结果与测井曲线吻合度更高.基于宽频数据和常规数据分别进行约束稀疏脉冲弹性波阻抗反演,预测A构造优质储层分布,经已钻井证实,宽频数据比常规数据储层预测精度高,预测的储层展布特征与研究区地质沉积认识一致.结果表明:这种基于宽频子波提取的宽频资料应用方法有效降低了致密砂岩储层预测的多解性. 相似文献
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在井下地震观测中,各种地表背景噪声具有显著衰减作用,针对中国地震科学台阵现有大量非专用浅井式设计的Guralp CMG系列地震计,以及目前多个新获批项目在高背景噪声区域的观测需求,设计一种野外实用浅井观测方式,在北京国家地球观象台进行不同深度、不同井壁材质的观测对比实验,分析研究观测数据的背景噪声功率谱密度,结果表明,随着浅井深度的增加,地震背景噪声在垂直、水平向得到改善,改善程度随频率变化有所不同。分析认为,在华北现有地质环境下,6 m浅井是较为经济的观测方式,性价比高、占地小、施工简便,可用于后续多个项目的宽频带流动地震台阵观测。 相似文献
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J. J. Galiana-Merino A. K. Mahajan C. Lindholm J. Rosa-Herranz A. K. Mundepi Nitesh Rai 《Bulletin of Earthquake Engineering》2011,9(5):1309-1325
In recent years, seismic noise array measurements have emerged as a promising way for estimating Vs profiles and characterizing
the corresponding soil structure. Although methods based on analysis of seismic noise are simpler, cheaper and faster than
conventional soil penetrating techniques, array deployment requires the use of several stations which are not always available
for all the research groups. Broadband stations are expensive, but even short-period sensors can require a significant economical
effort as it is necessary to use several. In this paper, the results from broadband stations and vertical geophones using
the f-k method have been compared. Circular arrays with both types of instruments were installed north and south of the Himalayan
Frontal Thrust (HFT) also known as Mohand Thrust, with different soil characteristics. The comparison carried out in terms
of dispersion curves shows an excellent agreement between broadband stations and geophones recordings in the frequency range
of applicability of the arrays used. These results indicate the possibility of using seismic refraction equipments for the
f-k analysis in the frequency band of geotechnical engineering interest. This has potentially great importance since the same
equipment is indicated to be applicable for both seismic noise measurements as well as for active reflection seismic surveys. 相似文献
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井下甚宽频带地震观测能获取来自地球内部微弱的、丰富的、准确的宽频带地壳活动信息,包括地层微破裂、慢地震等,对地震学、地震预报和相关学科均有重要的科学研究意义和实际应用价值。研制具有我国自主知识产权的井下甚宽频带地震仪,并推进其工程化、产业化是地震观测仪器发展的重要方向之一。本文介绍了国家重点研发项目重大科学仪器设备开发专项 “井下甚宽频带地震仪的研制与应用开发” 的研究目标、研究内容及主要创新点。项目首次在国内外成功研制了可应用于2000 m深井观测的、完全自主知识产权的甚宽频带地震仪,并将在国家级重大项目中示范应用,打破了国外在井下甚宽频带地震观测的领先地位,促进了国内地震观测科学技术的发展。项目的主要进展将在项目专题中的4篇文章中分别进行介绍。 相似文献
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Seismic response of sliding equipment and contents in base‐isolated buildings subjected to broadband ground motions 下载免费PDF全文
Base isolation has been established as the seismic design approach of choice when it comes to protecting nonstructural contents. However, while this protection technology has been widely shown to reduce seismic demands on attached oscillatory equipment and contents (EC), its effectiveness in controlling the response of freestanding EC that are prone to sliding has not been investigated. This study examines the seismic behavior of sliding EC inside base‐isolated buildings subjected to broadband ground motions. The effect of isolation system properties on the response of sliding EC with various friction coefficients is examined. Two widely used isolation models are considered: viscously damped linear elastic and bilinear. The study finds isolation to be generally effective in reducing seismic demands on sliding EC, but it also exposes certain situations where isolation in fact increases demands on EC, most notably for low friction coefficients and high earthquake intensities. Damping at the isolation level is effective in controlling the EC sliding displacements, although damping over about 20% is found to be superfluous. The study identifies a physically motivated dimensionless intensity measure and engineering demand parameter for sliding equipment in base‐isolated buildings subjected to broadband ground motions. Finally, the paper presents easy‐to‐use design fragility curves and an example that illustrates how to use them. Copyright © 2014 John Wiley & Sons, Ltd. 相似文献