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| Joint processing and analysis of seismic gravity measurements in Capital Circle area | |
| 作者姓名： | 贾民育 马丽 刘少明 张晶 孙少安 王武星 |
| 作者单位： | [1]Institute of Seismology, China Earthquake Administration, Wuhan 430071, China [2]Institute of Earthquake Science, China Earthquake Administration, Beijing 100036, China [3]Crustal Movement Laboratory, Wuhan 430071, China [4]Wuhan Base of Institute of Crustal Dynamics, China Earthquake Administration, Wuhan 430071, China |
| 基金项目： | National Natural Science Foundation of China (49974019, 40574020, 10371012). |
| 摘 要： | In Capital Circle area, there are three groups of repeated gravity measurements observed by different institutes using different instruments or methods. The simultaneous adjustment of absolute and relative measurements and the elimination of systematic error among the relative measurements have been carded out in this paper. Thus an unified temporal gravity change system with absolute reference has been established. On the basis of this, the crustal subsidence effect on gravity, which belongs to non-tectonic factor, is analyzed and the station displacement corrections are carried out, so that the long-wave disturbance is eliminated. So far our following aims are realized： the advantages of the absolute and relative measurement methods are complementary to each other; the contradiction and environment disturbance are eliminated; the amounts of information are enlarged; the sampling interval of time domain is compressed. In a word, the ability of identifying the tectonic activity process is enhanced. The results show that： there are systematic errors between the two groups of relative measurements and within the data of 10 campaigns ; the uneven local crustal subsidence in the southeast of the study area results in a linear rise of gravity value at 10 stations; they can be corrected by the regression analysis. The maps of revised temporal gravity change can obviously and integrally reflect the Ms=5.0 earthquake in Guye on October 6, 1995. |
| 关 键 词： | 重力变化 地震 震源物理 地球 |
| 文章编号： | 1000-9116（2006）04-0438-10 |
| 收稿时间： | 2005-09-28 |
| 修稿时间： | 2006-05-09 |
Joint processing and analysis of seismic gravity measurements in Capital Circle area |
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| JIA Min-yu,MA Li,LIU Shao-ming,ZHANG Jing,SUN Shao-an,WANG Wu-xing.Joint processing and analysis of seismic gravity measurements in Capital Circle area[J].Acta Seismologica Sinica(English Edition),2006,19(4):438-447. | |
| Authors: | JIA Min-yu MA Li LIU Shao-ming ZHANG Jing SUN Shao-an WANG Wu-xing |
| Institution: | 1. Institute of Seismology, China Earthquake Administration, Wuhan 430071, China 2. Institute of Earthquake Science, China Earthquake Administration, Beijing 100036, China 3. Institute of Seismology, China Earthquake Administration, Wuhan 430071, China;Crustal Movement Laboratory, Wuhan 430071, China;Wuhan Base of Institute of Crustal Dynamics, China Earthquake Administration, Wuhan 430071, China |
| Abstract: | In Capital Circle area, there are three groups of repeated gravity measurements observed by different institutes using different instruments or methods. The simultaneous adjustment of absolute and relative measurements and the elimination of systematic error among the relative measurements have been carried out in this paper. Thus an unified temporal gravity change system with absolute reference has been established. On the basis of this, the crustal subsidence effect on gravity, which belongs to non-tectonic factor, is analyzed and the station displacement corrections are carried out, so that the long-wave disturbance is eliminated. So far our following aims are realized: the advantages of the absolute and relative measurement methods are complementary to each other; the contradic- tion and environment disturbance are eliminated; the amounts of information are enlarged; the sampling interval of time domain is compressed. In a word, the ability of identifying the tectonic activity process is enhanced. The re- sults show that: there are systematic errors between the two groups of relative measurements and within the data of 10 campaigns ; the uneven local crustal subsidence in the southeast of the study area results in a linear rise of grav- ity value at 10 stations; they can be corrected by the regression analysis. The maps of revised temporal gravity change can obviously and integrally reflect the MS=5.0 earthquake in Guye on October 6, 1995. |
| Keywords: | Capital Circle area temporal gravity change relative measurement absolute measurement unified system |
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