Through the accurate determination of hypocenter location, the measurement of the main focal mechanism solutions and the analyses of time dependent processes for Sichuan Mianzhu earthquake sequence with M S=5 0 occurr...Through the accurate determination of hypocenter location, the measurement of the main focal mechanism solutions and the analyses of time dependent processes for Sichuan Mianzhu earthquake sequence with M S=5 0 occurred along the middle segment of Longmenshan fault zone on November 30, 1999, the distribution of focal depth section, the stress release and seismicity features are given to reveal the earthquake-generating structure of the earthquake sequence. The obtained results show the activity features for this sequence as follows: ① There is no obvious foreshock, the accumulated strain energy releases in nearly pulse way, fluctuation of the seismic activity level is not quite evident during the duration of the sequence, and the statistical relation between the large events and the small events is less compatible with the traditional G-R estimation; ② The epicenters of the earthquake sequence are not distributed on the main Longmenshan piedmont faults emerging out ground, but near the hidden Longmenshan piedmont faults. The direction of epicenter distribution is not very coincident with the fault strikes. The microscopic epicenters are relatively far from the macroscopic epicenters. The focal depths range from 5km to 16km; ③ The fractures of focal fault plane with the NE strike appear out the strike-slip displacement with a few overthrust components under the major principal compressive stress of NNE direction. From these, we consider it should be paid more attentions to the underground hidden faults near the ground fault zone on a large scale for their generating earthquake risk.展开更多
The current planning system in China lacks coordination, which is a crucial issue to be explored to fully implement the multi-plan integration. Mianzhu is an example that is officially named as one of the pilot cities...The current planning system in China lacks coordination, which is a crucial issue to be explored to fully implement the multi-plan integration. Mianzhu is an example that is officially named as one of the pilot cities for multi-plan integration on the county level. The paper firstly analyzes the problems associated with multi-plan integration in Mianzhu, including the indeterminate hierarchy of the planning system, the disunity of technical standards, problems regarding spatial order, coordination and division of powers and functions, and the intensive utilization of spatial resources, the lack of a coordination mechanism, and low participation of experts and the public. Secondly, by learning from Germany's spatial planning, and also practical experiences of pilot cities for multi-plan integration in China, this paper creatively brings in the connotation of multi-plan integration on the county level, and further proposes a power division based on three-level planning system and three kinds of space, the reinforcement of a spatial order, intensive spatial utilization, and a planning coordination mechanism, hoping to provide reference to other cities.展开更多
DEAR EDITOR, I couldn't help noticing some nice New Year pictures when I was looking over the October 1999 issue of Women of China (a special issue for the 50th anniversary of New China's foundation). They wer...DEAR EDITOR, I couldn't help noticing some nice New Year pictures when I was looking over the October 1999 issue of Women of China (a special issue for the 50th anniversary of New China's foundation). They were on page 44 in the column: "Living in China." As I am very interested in such paintings, would you kindly tell me where I can buy them? And are there any places selling展开更多
农村居民点整治潜力测算及模式确定是土地整治规划的重要组成部分。该文针对灾后重建区农村居民点整治的复杂状况,采用实地调查数据与户均建设用地标准法,以行政村为单元,介绍了一种灾后重建区农村居民点整治潜力的测算方法;在此基础上...农村居民点整治潜力测算及模式确定是土地整治规划的重要组成部分。该文针对灾后重建区农村居民点整治的复杂状况,采用实地调查数据与户均建设用地标准法,以行政村为单元,介绍了一种灾后重建区农村居民点整治潜力的测算方法;在此基础上,选取了包括整治潜力在内的影响重建区整治模式的15个典型指标,通过分析处理土地利用、数字高程模型及社会经济与人口等数据,运用地理信息系统软件ArcGIS对各指标进行定量描述,并结合多元统计分析软件SPSS(statistical productand service solutions)提取6个主成份指标,通过层次聚类法将155个行政村进行量化分析,最终确定了5种农村居民点整治模式。研究表明,绵竹市农村居民点整治潜力为1763.23hm2;适宜改造提升模式的村有81个、适宜特色整治模式的村15个、适宜迁村并点模式的村16个、适宜集聚扩展模式的村28个、适宜生态搬迁模式的村15个。该研究成果可为灾后重建地区农村居民点整治规划及整治模式的选择提供理论支撑和实践指导。展开更多
文摘Through the accurate determination of hypocenter location, the measurement of the main focal mechanism solutions and the analyses of time dependent processes for Sichuan Mianzhu earthquake sequence with M S=5 0 occurred along the middle segment of Longmenshan fault zone on November 30, 1999, the distribution of focal depth section, the stress release and seismicity features are given to reveal the earthquake-generating structure of the earthquake sequence. The obtained results show the activity features for this sequence as follows: ① There is no obvious foreshock, the accumulated strain energy releases in nearly pulse way, fluctuation of the seismic activity level is not quite evident during the duration of the sequence, and the statistical relation between the large events and the small events is less compatible with the traditional G-R estimation; ② The epicenters of the earthquake sequence are not distributed on the main Longmenshan piedmont faults emerging out ground, but near the hidden Longmenshan piedmont faults. The direction of epicenter distribution is not very coincident with the fault strikes. The microscopic epicenters are relatively far from the macroscopic epicenters. The focal depths range from 5km to 16km; ③ The fractures of focal fault plane with the NE strike appear out the strike-slip displacement with a few overthrust components under the major principal compressive stress of NNE direction. From these, we consider it should be paid more attentions to the underground hidden faults near the ground fault zone on a large scale for their generating earthquake risk.
基金supported by the Science and Technology Projects for People of Chengdu Municipal Science and Technology Bureau(2015-HM01-00356-SF)Sichuan Tourism Development and Research Center Project(LYC15-14)Project of Resource-Based Urban Development Research Center(ZYZXYB-1506)
文摘The current planning system in China lacks coordination, which is a crucial issue to be explored to fully implement the multi-plan integration. Mianzhu is an example that is officially named as one of the pilot cities for multi-plan integration on the county level. The paper firstly analyzes the problems associated with multi-plan integration in Mianzhu, including the indeterminate hierarchy of the planning system, the disunity of technical standards, problems regarding spatial order, coordination and division of powers and functions, and the intensive utilization of spatial resources, the lack of a coordination mechanism, and low participation of experts and the public. Secondly, by learning from Germany's spatial planning, and also practical experiences of pilot cities for multi-plan integration in China, this paper creatively brings in the connotation of multi-plan integration on the county level, and further proposes a power division based on three-level planning system and three kinds of space, the reinforcement of a spatial order, intensive spatial utilization, and a planning coordination mechanism, hoping to provide reference to other cities.
文摘DEAR EDITOR, I couldn't help noticing some nice New Year pictures when I was looking over the October 1999 issue of Women of China (a special issue for the 50th anniversary of New China's foundation). They were on page 44 in the column: "Living in China." As I am very interested in such paintings, would you kindly tell me where I can buy them? And are there any places selling
文摘农村居民点整治潜力测算及模式确定是土地整治规划的重要组成部分。该文针对灾后重建区农村居民点整治的复杂状况,采用实地调查数据与户均建设用地标准法,以行政村为单元,介绍了一种灾后重建区农村居民点整治潜力的测算方法;在此基础上,选取了包括整治潜力在内的影响重建区整治模式的15个典型指标,通过分析处理土地利用、数字高程模型及社会经济与人口等数据,运用地理信息系统软件ArcGIS对各指标进行定量描述,并结合多元统计分析软件SPSS(statistical productand service solutions)提取6个主成份指标,通过层次聚类法将155个行政村进行量化分析,最终确定了5种农村居民点整治模式。研究表明,绵竹市农村居民点整治潜力为1763.23hm2;适宜改造提升模式的村有81个、适宜特色整治模式的村15个、适宜迁村并点模式的村16个、适宜集聚扩展模式的村28个、适宜生态搬迁模式的村15个。该研究成果可为灾后重建地区农村居民点整治规划及整治模式的选择提供理论支撑和实践指导。
