Physical meaning and prediction efficiency of the load/unload response ratio of rocks in strain-weakening phase before failure     

许昭永  杨润海  王彬  赵晋明  王赟赟  梅世蓉 《地震学报(英文版)》2002,15(1):47-55

Introduction In studying the instability of a non-linear system, YIN (1987), YIN and YIN (1991), YIN, et al (1994), and Yin, et al (1994, 1995, 2000) have presented a concept of load/unload response ratio (LURR) of the system. When the system is in a stable state, its response process to the load/unload follows the same trajectory on the stress-strain diagram, and the load/unload response ratios are equal. However, when the system departs from a stable state, its response to the load/un…  相似文献   

Seismological study on the crustal structure of Tengchong volcanic-geothermal area     

王椿镛  楼海  吴建平  白志明  皇甫岗  秦嘉政 《地震学报(英文版)》2002,15(3):247-259

Introduction The Tengchong volcanic-geothermal area is located on the northeast edge of the collision zone between Indian and Eurasian plates, and belongs to Eurasian volcanic zone (the MediterraneanHimalayanSoutheast Asia volcanic zone). In Tengchong area, the Quaternary volcanic, geothermal and seismic activities are all intensive. These phenomena have been drawing the attention of many geoscientists in the world. Their studies are concerned with geology, geophysics, geochemistry, and cr…  相似文献   

澄江地震的后续丘北5.5级地震研究          下载免费PDF全文

徐彦 《地震工程学报》2002,24(1):92-96

1999年 1 1月 2 5日澄江发生 5.2级地震 ,2个月后的 2 0 0 0年 1月 2 7日在相邻的丘北 -弥勒地区发生了 5.5级地震 .分析了丘北—弥勒 5.5级地震的区域地震活动背景、地震孕育过程和地震活动性异常特征 ,为探讨在一次中强地震后如何预报后续地震提供了一个震例 .  相似文献   

云南腾冲火山区上部地壳三维地震速度层析成像   总被引：22，自引：3，他引：22  

楼海  王椿镛  皇甫岗  秦嘉政 《地震学报》2002,24(3):243-251

根据1999年腾冲火山区人工地震探测资料，用层析成像方法反演了腾冲火山区上地壳三维P波速度结构．层析成像结果显示出，在腾冲火山区下方的上地壳内存在明显的P波低速区，该低速区在地下7～8km深度，可能与上地壳内的岩浆囊或部分熔融体有关．层析结果还显示出低速区主体在热海地区的东北侧．地表附近的低速区可能是构造破裂发育地区形成了有利于深部热流体上升的通道，因此，在热海形成最活跃的地热显示．   相似文献   

Body waveform inversion for the source process of the February 3, 1996 Lijiang, Yunnan earthquake     

Yang Xu  Masayuki Kikuchi  You-Jin Su 《地震学报(英文版)》1998,11(2):135-140

The source process of February 3, 1996 Lijiang earthquake in Yunnan was studied by body waveform inversion using teleseismic data from IRIS. Two normal double-couple subevents with different strikes were obtained. The difference of the onset time between these two subevents, which are 15 km apart in space, is 7 s. The total seismic moment is 3.81 × 10¹⁸ Nm (M _w=6.3). The total fault area S is about 720 km² from the aftershock data and the average dislocation is about ū=0.18 m. Considering both the result of inversion and tectonic environment around the source, the first rupture might result from the extension along the NNW directed Zhongdian-Yongsheng fault belt where an earthquake of M=6.4 occurred in 1966. Then, the second started along the NE directed the eastern foot of Snow Mountain fault where rupture seemed to be able to propagate more easily.  相似文献   

基于GMS软件对某矿区松散层孔隙水污染的数值模拟研究     

白杰  徐世光  黄建国  熊茹雪 《地质灾害与环境保护》2020,(1):97-103

以云南某矿区为研究对象,在详细调查区域水文地质条件和已有资料的基础上,结合调查区监测井,利用GMS软件建立研究区域地下水水流场模型和溶质运移模型。模型计算了在合理误差范围内的水流场模型并预测了硫酸盐在持续泄漏730d、180d后切断泄漏源,硫酸盐的迁移过程。研究结果表明:随着持续泄漏时间的增加,调查区域北部边界附近受到污染的浓度越高、污染范围越广,超标的污染物在北部边界区域进入岩溶含水层,遇到岩溶带会加速污染物向下游运移,破坏下游水质、危及下游村庄饮用水安全。  相似文献   

2000年姚安MS65地震震源及近邻区的低QS   总被引：1，自引：0，他引：1       下载免费PDF全文

李白基  秦嘉政  叶建庆  钱晓东 《地球物理学报》2006,49(5):1395-1400

利用震源距23 km范围内观测的2000年姚安MS65地震余震记录，计算了震源及近邻区域的尾波规一直达S波在频率15～20 Hz之间的傅里叶谱振幅.结果显示谱振幅随震源距增大而增大， 在对谱振幅进行了震源辐射方向性校正之后, 才出现谱振幅随震源距衰减的现象.由此获得了震源及近邻区域S波的Q(f)值,可表示为QS(f)=89f098其值比由尾波得出的姚安地区的平均QC(f)值低得多，表明了震源破裂带的强烈非均匀性对QS(f)的重大影响.  相似文献   

The Time-Frequency Energy Attenuation Factor and Its Application on the Basis of Gauss Linear Frequency-Modulated Continuous Wavelet Transform     

Liu Xiqiang 《中国地震研究》2004,18(1):42-53

Based on the Gauss linear frequency-modulated wavelet transform, a new characteristic index is presented, namely time-frequency energy attenuation factor which can reflect the difference features of waveform in earthquake focus mechanism, wave traveling path and its attenuation characteristics in focal area or near field. In order to test its validity, we select the natural earthquakes and explosion or collapse events whose focus mechanisms vary obviously, and some natural earthquakes located at the same site or in a very small area. The study indicates that the time-frequency energy attenuation factors of the natural earthquakes are obviously different with that of explosion or collapse events, and the change of the time-frequency energy attenuation factors is relatively stable for the earthquakes under the normal seismicity background. Using the above-mentioned method, it is expected to offer a useful criterion for strong earthquake prediction by continuous earthquake observation.  相似文献   

波列振幅P em>-Sem>曲线测桩法          下载免费PDF全文

胡毅力  许峻  段永康  许昭永  杨润海  赵晋明 《地震学报》2004,26(6):660-668

叙述一种新的大应变检测单桩竖向承载力的方法. 用重锤或小型火箭筒冲击桩顶，用检波器记录振波图. 引入应变（变形力）的高次项，从理论上证明当为大位移大应变， 即桩相对于土体产生整体滑动时，位移、速度和加速度则不能经过简单积分加速度和微分速度得到，即它们为非线性关系. 由此导出:通过波列振幅计算力（P）和位移（S）,并作（动态）P-S曲线、确定屈服点，进而阐述确定单桩竖向承载力的方法，并利用静载荷试验检验动测结果和确定动静P（Q）S曲线的相关常数.   相似文献   

信息化时代地震观测技术的产业化问题     

周挚  山秀明  任勇  李倩  王征  郭天乐 《国际地震动态》2004,(6):8-14

国家间的竞争集中表现为前瞻性技术领域的竞争，占领技术制高点成为各国国家发展的基本取向。本文结合地震观测现状和现代信息网络技术、自动化控制技术的进展，概述了地震观测技术产业化发展的社会需求和科学需求，从国家科技发展战略层次上初步探讨了地震观测技术产业化发展的重要性和必然性。  相似文献