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The Feature of Segmentation Activity on the Northern Segment of the Anninghe Fault Zone Since Late Pleistocene

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Earthquake Research in china 1994年第4期8卷 134-142页

作者： Tang Rongchang,Qian Hong,Huang Zuzhi,wen Dehua,Wu Xianguo,Cai Changxing and Tian Hong seismological bureau of sichuan province,chengdu 610041,china

Based on fault geometric features,composite pattern,faulting land-forms and seismic data,this paper discussed the activity behavior along the northern segment of the Anninghe fault(from Xichang to Shimian)since the Late *** fault can be divided into three active segments by discrepancies of their activity:the segment from Xichang to Mianning,the segment from Mianning to Zimakua,and the segment from Zimakua to *** southern segment has the background of occurrence of great earthquakes,but the middle and the northern segments can generate strong and moderate events *** to the features of quartz from fault gouges by scanning electron microscopy(SEM),this paper discussed the movement features along the fault and indicated the stick-slipping feature on the segment from Xichang to Zimakua,the creeping feature on the segment from Jiziping to Tianwan and the transitional feature on the segment in between.

关键词： Anninghe fault Faulting landform Most recently active surface fault Stick slipping Creeping

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川西地震强化监视区的基本情况与工作设想

四川地震 2003年第2期 1-6页

作者：闻学泽四川省地震局四川成都610041

川西地震强化监视区属于计划建立的中国内地首批5个地震强化监视区之一。在初步方案中,该区沿川滇活动地块的东北—东部边界的一部分展布,区内有鲜水河断裂中—南段,安宁河、则木河以及大凉山等活动断裂,总面积约为6万平方千米。本文着... 详细信息

川西地震强化监视区属于计划建立的中国内地首批5个地震强化监视区之一。在初步方案中,该区沿川滇活动地块的东北—东部边界的一部分展布,区内有鲜水河断裂中—南段,安宁河、则木河以及大凉山等活动断裂,总面积约为6万平方千米。本文着重介绍了川西地震强化监视区的基本情况、历史与现今强震活动背景、中长期地震潜势、现有的工作基础和监测能力。最后,作者提出在该区开展强化监测工作的建议,以及与该区中期—短期震情跟踪和预报实践紧密相关的研究课题。

关键词：川西地震强化监视区地震潜势地震监测地震预报

四川省地震重点监视防御区未来地震潜势的研究

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四川地震 1992年第1期 1-25页

作者：闻学泽陈农四川省地震局

本文通过历史地震及现今地震活动性的分析、活断层分段理论及地震空区理论的应用、地震平均复发间隔及复发条件概率的估算以及多学科专家综合评估方法的引入,对川西鲜水河—安宁河—则木河断裂和滇东小江断裂带(中—北段)上15个不同段... 详细信息

本文通过历史地震及现今地震活动性的分析、活断层分段理论及地震空区理论的应用、地震平均复发间隔及复发条件概率的估算以及多学科专家综合评估方法的引入,对川西鲜水河—安宁河—则木河断裂和滇东小江断裂带(中—北段)上15个不同段落的地震潜势进行了深入的研究。进一步修正并重新圈绘出位于鲜水河—安宁河—则木河断裂带上的四川省地震重点监视防御区,其范围:北起道孚县的葛卡或者松林口一带,南至西昌市,沿鲜水河—安宁河—则木河主干断裂带展布,全长约350千米。按对未来地震震级估计的不同,该区可分成3段。第1段位于葛卡或松林口至康定之间,震级估计为7±1/4级;第2段位于康定与石棉之间,估计的震级是6(1/2)±1/4;第3段位于石棉至西昌之间,震级估计为7～7(1/2)。此外,研究结果还显示了小江断裂带上的新塘湾和寻甸—嵩明两个段落未来15年内强震发生的概率相对较高。

关键词：震源分段性 I类空区地震复发概率地震危险区专家评估地震活动性地震重点监视防御区

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若干原地复发强震震源区的震级—频度关系

四川地震 1993年第2期 19-28页

作者：闻学泽陈农四川省地震局

为了检验属于板内构造环境的中国大陆是否存在“特征地震”的复发行为,本文研究了10个原地复发强震震源区的震级—频度关系,其中,各震级档的地震频度均按主震之间的时间间隔归一化。结果主要表明:在单一震源或发震断裂段的震级—(对数)... 详细信息

为了检验属于板内构造环境的中国大陆是否存在“特征地震”的复发行为,本文研究了10个原地复发强震震源区的震级—频度关系,其中,各震级档的地震频度均按主震之间的时间间隔归一化。结果主要表明:在单一震源或发震断裂段的震级—(对数)累积频度关系图上,中—小地震部分仍然服从于G—R(古登堡—李克特)关系(指数分布);而主要大小的(特征)地震部分明显地离开中—小地震部分的G—R关系曲线,亦即不服从于指数分布或b值模型;在这两个不连续部分之间存在1—2个震级单位的频次“空档”;而代表一个震源区主要大小地震的特征事件,其震级波动大多在0.5个震级单位左右。这些结果与Schwartz和Coppersmith(1984)提出的特征地震震级—频度模式一致。

关键词：地震震级频度震源区强震

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龙门山断裂带茂汶—汶川段的长期强震潜势

四川地震 1994年第3期 51-58页

作者：白兰香闻学泽四川省地震局

茂汶—汶川断裂段是龙门山断裂带中历史地震活动强度最大的一段，自１６５７年Ⅸ度地震以来，已有３３７年未发生过Ｍ≥６级的强震。为了分析该段未来的长期地震潜势，本文较系统地分析了那里的破坏性地震及有感地震资料，并进一步应用... 详细信息

茂汶—汶川断裂段是龙门山断裂带中历史地震活动强度最大的一段，自１６５７年Ⅸ度地震以来，已有３３７年未发生过Ｍ≥６级的强震。为了分析该段未来的长期地震潜势，本文较系统地分析了那里的破坏性地震及有感地震资料，并进一步应用中国大陆特征地震轮回模式及其复发时间概率模型估算了该断裂段当前特征地震轮回的平均时间间隔，以及从１９９５年起未来百年内复发强震的概率；同时分析了以概率表征的地震复发危险性随时间推移的变化过程。结果表明未来５０—１００年内该断裂段复发强震的危险性为中等及中—高水平，但近几年内发震的可能性较小。

关键词：历史地震地震发震概率强震龙门山断裂

Rupture segmentation and slip partitioning of the mid-eastern part of the Kunlun Fault,north Tibetan Plateau

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Science china Earth Sciences 2011年第11期54卷 1730-1745页

作者： LI ChenXia XU XiWei wen xueze ZHENG RongZhang CHEN GuiHua YANG Hu AN YanFen GAO Xiang Institute of Geology China Earthquake Administration National Center of Active Fault Studies Beijing 100029 China Lanzhou seismological Institute of china Earthquake Administration Lanzhou 730000 China Earthquake Administration of sichuan province Chengdu 610041 China

The Kunlun Fault, an active fault on the border between the Bayan Har and Kunlun-Qaidam blocks, is one of the major left lateral strike-slip faults in the Tibetan Plateau. Previous research has not reached a consensus on agreeable slip rates along much of its length and the slip rate gradient along the eastern part, both of which play critical roles in a range of models for the eastward extrusion and thickened crust of the Tibetan Plateau. New slip rates have been determined at sites along the eastern part of the Kunlun Fault by dating deposits and measuring atop displaced fluvial terrace risers. Field investigations and interpretation of satellite images reveal geometrical features of the fault and the late Quaternary offset, new earthquake ruptures and surface-rupturing segmentation, from which long-term slip rates and earthquake recurrence intervals on the fault are estimated. The tectonic geomorphology method has determined that the long-term horizontal slip rates on the Tuosuohu, Maqin and Ma- qu segments from west to east are 11.2±1, 9.3±2, and 4.9±1.3 mm/a while their vertical slip rates are 1.2±0.2, 0.7±0.1, and 0.3 mm/a in the late Quaternary. Results indicate that the slip rates regularly decrease along the eastern -300 km of the fault from 〉10 to 〈5 mm/a. This is consistent with the decrease in the gradient such that at the slip rate break point is at the triple point intersection with the transverse fault, which in turn is transformed to the Awancang Fault. The vector decomposition for this tectonic transformation shows that the western and eastern branches of the Awancang Fault fit the slip-partitioning mode. The slip rate of the southwestern wall is 4.6 mm/a relative to the northeastern wall and the slip direction is 112.1°. The mid-eastern part of the Kunlun Fault can be divided into three independent segments by the A＇nyemaqen double restraining bend and the Xigongzhou intersection zone, which compose the surface rupture segmentation indicators for t

关键词： mid-eastern Kunlun Fault slip rate surface rupture segmentation slip partition paleoearthquake Tibetan Plateau

断层气CO_2测点选建及观测资料在四川绵竹、雅江地震前的反映

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四川地震 2002年第4期 22-27页

作者：官致君闻学泽程万正四川省地震局四川成都610041

介绍了断层气CO2 测定方法及川西地区断层气CO2 观测点的选建和观测情况。初步观测结果显示 ,在1999年 9月和 11月四川绵竹两次 5 0级地震及 2 0 0 1年 2月四川雅江 5 0级地震和 6 0级地震前 ,川北和冕宁测点的断层气CO2 有很好的短... 详细信息

介绍了断层气CO2 测定方法及川西地区断层气CO2 观测点的选建和观测情况。初步观测结果显示 ,在1999年 9月和 11月四川绵竹两次 5 0级地震及 2 0 0 1年 2月四川雅江 5 0级地震和 6 0级地震前 ,川北和冕宁测点的断层气CO2 有很好的短期地震前兆异常显示。观测结果还表明 ,直接埋设在断层破碎带上的观测点可能比埋在第四纪松散堆积层中的观测点能更好地检测到来自地壳内部的断层气CO2 异常信息。

关键词：断层气地震前兆信息 CO2 二氧化碳四川观测资料

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黄海及其沿岸历史地震初步研究

四川地震 2002年第2期 14-22页

作者：吴戈刘昌森江在雄翟文杰吴镝辽宁省地震局辽宁沈阳110031 上海市地震局上海200062 四川省地震局四川成都610041

黄海及其边缘 ,经历史地震资料整理、地震参数估定与编目 ,截至 1949年 8月 ,共有M≥ 3级地震 2 187次 ,其中M≥ 434级地震 2 5 9次。资料显示大致有三个相对集中活跃区 ,16世纪曾有过历史地震活动高潮。

关键词：黄海沿岸朝鲜半岛历史地震震级估定

Average slip-rate and recent large earthquake ruptures along the Garzê-Yushu fault

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Science china Earth Sciences 2003年第z2期46卷 276-288页

作者： wen xueze (闻学泽) XU Xiwei (徐锡伟) ZHENG Rongzhang (郑荣章) XIE Yingqing (谢英情) WAN Chuang (万创) seismological bureau of sichuan province Chengdu 610041 China Institute of Geology China Seismological Bureau Beijing 100029 China Institute of Geology China Seismological Bureau Beijing 100029 China Seismological Bureau of Yunnan Province Kunming 650041 China Seismological Bureau of Sichuan Province Chengdu 610041 China

Our field investigation obtains new evidence of the later Quaternary activity and recent large earthquake ruptures of the Garzê-Yushu fault. The average left-lateral slip-rate along the fault is determined to be (12 ± 2) mm/a for the last 50000 years from both offset landforms and ages of the correlative sediments. This result is very close to the estimated average left-lateral slip-rate for the Xianshuihe fault, suggesting that the horizontal movement along the northern boundary of the sichuan-Yunnan active tectonic block and the northeastern boundary of the Qiangtang active tectonic block has been basically harmonious during the later Quaternary period. Remains of ground ruptures of recent large earthquakes have been discovered along all 3 segments of the fault, of which, the 1896 rupture on the northwestern segment is at least 70 km long, and its corresponding earthquake could be of moment magnitude 7.3. The latest rupture on the middle segment of the fault has a length of about 180 km, and was produced by an unknown-age large earthquake that could have a moment magnitude of about 7.7. Along the southeastern segment of the fault, the latest unknown-age rupture is about 65 km long and has a maximum left-lateral coseismic displacement of 5.3 m, and its corresponding earthquake is estimated to be as large as about 7.3 of moment magnitude. Based on relevant investigation, an inference has been drawn that the later two large earthquakes probably occurred in 1854 and 1866, respectively. These demonstrate that the individual segments of the studied Garzê-Yushu fault are all able to produce large earthquakes.

关键词： Garzê-Yushu fault, average slip-rate, earthquake rupture, earthquake timing.