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维西—乔后断裂北段晚第四纪活动的地质地貌表现

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地球学报 2024年第3期45卷 309-319页

作者：李鉴林常祖峰阿拉塔云南省地震局云南昆明650224

维西—乔后断裂位于青藏高原与云贵高原接壤地带,是青藏高原东南缘一条规模较大的活动断裂。研究其新构造活动特征对认识川滇块体构造格局和运动图像具有重要的科学意义。据野外详细的地质地貌调查结果,重点阐述断裂北段的运动特征及其... 详细信息

维西—乔后断裂位于青藏高原与云贵高原接壤地带,是青藏高原东南缘一条规模较大的活动断裂。研究其新构造活动特征对认识川滇块体构造格局和运动图像具有重要的科学意义。据野外详细的地质地貌调查结果,重点阐述断裂北段的运动特征及其滑动速率。研究表明:白济讯、维西县城及扎你洛等地均发现晚更新世活动的地质证据,有明显的晚第四纪活动迹象;该段运动性质以右旋走滑为主,根据阶地扭曲、陡坎等测得其水平滑动速率为1.0~1.2 mm/a,垂直滑动速率为0.3~0.4 mm/a。

关键词：维西—乔后断裂晚更新世滑动速率

维普期刊数据库博看期刊

New Discovery of Holocene Activity along the Weixi-Qiaohou Fault in Southeastern Margin of the Tibetan Plateau and its Neotectonic Significance

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Acta Geologica Sinica(English Edition) 2018年第6期92卷 2464-2465页

作者： chang zufeng ZANG Yang and chang Hao Yunnan Earthquake Agency Kunming650224China

Objective The lateral extrusion eastward of the Tibetan Plateau leads to the formation of the Sichuan–Yunnan block, which is the most representative active block in the southeastern margin of the Tibetan Plateau, characterized by strong and frequent seismicity(Li Ping et al., 1975; Zhang Peizhen et al., 2003; Li Yong et al., 2017). Its eastern boundary is composed of sinistral faults including the Xianshuihe, Xiaojiang faults, etc., and the western

关键词： New Discovery of Holocene Activity along the Weixi-Qiaohou Fault in Southeastern Margin of the Tibetan Plateau and its Neotectonic Significance

Characteristics of ground cracks caused by the M_(S) 6.4 Yangbi earthquake and the corresponding tectonic significance

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Earthquake Research Advances 2022年第2期2卷 21-29页

作者： changwei Liu zufeng chang Jianlin Li Yunnan Earthquake Disaster Prevention Center Yunnan Earthquake AgencyKunmingChina

An M_(S)6.4 earthquake occurred near Yangbi County, Dali Bai Autonomous Prefecture, Yunnan Province, at 21:48on May 21, 2021. The earthquake location is characterized by complex geological structures, with multiple active faults distributed around the epicenter that is located at the west edge of the Sichuan-Yunnan rhombic block(25.67°N, 99.87°E). A total of 42 ground cracks are found by earthquake field investigations. The cracks are mainly concentrated in the Ⅷ degree area on the west side of the Yangbi River. Among these, 9 coseismic tectonic ground cracks generated by shear fractures are found in three villages(i.e., Akechang, Meijia-Lijia, and Huajiazhuang), which are distributed along the strike of the northwest-trending linear folds, showing the tectonic characteristics of right-lateral tension or left-stepping cracks. The structural attribute of ground cracks sustains the kinematic properties of the Weixi-Qiaohou fault, namely right-lateral strike-slip.

关键词： Yangbi earthquake Structural ground crack Weixi-Qiaohou fault Seismogenic structure

Performance of the Yangbi M_(S)6.4 earthquake disaster in different geomorphic units in Yunnan

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Earthquake Research Advances 2022年第2期2卷 30-37页

作者： Jianlin Li zufeng chang changwei Liu Yunnan Earthquake Agency Kunming650224China

An M_(S)6.4 earthquake occurred in Yangbi,Yunnan province,on May 21,*** to related investigations,the macro-epicenter of the earthquake is 6 km northwest of Yangbi County,and the seismogenic structure is the NW-trending Weixi-Qiaohou *** earthquake area is located in the hinterland of the Hengduan Mountains in the northwest of Yunnan Province,a region dominated by high and medium-high mountains,with deep canyons and tectonic basins in *** geomorphic features are derived from drastic topographic changes and huge geological differences in the earthquake *** are a variety of buildings in the earthquake-affected zone,including civil and brick-wood structures ones with weak seismic performance,as well as brick-concrete and frame ones with better seismic *** paper summarizes and analyzes different characteristics of the earthquake in different geomorphic units through field investigations of different buildings and geological disasters in the affected *** results show that under the same earthquake intensity,the damage to most buildings(located in slope areas or rooted in weak strata)is amplified by the *** earthquake has exerted an obvious propagation effect along the direction of the seismogenic ***,local ground fissures will aggravate the damage to the buildings even without surface ***,we suggest that attention should be paid to the ground fissures caused by the slope *** fissure areas may also be the disaster spot of collapses and landslides in case of a high-magnitude earthquake.

关键词： Yangbi M_(S)6.4 earthquake Earthquake intensity Geomorphic unit Earthquake disaster

The 2014 Northern Thailand Mw 6.1 Earthquake and its Seismogenic Tectonics

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Acta Geologica Sinica(English Edition) 2022年第2期96卷 648-660页

作者： chang zufeng DONG Pin-liang YUAN Renmao HOU Jianjun HE Zhongtai LI Jianlin chang Hao Yunnan Earthquake Agency Kunming 650224China Department of Geography and the Environment University of North TexasDentonTX 76203USA Key Laboratory of Active Tectonics and Volcanism Institute of GeologyChina Earthquake AdministrationBeijing 100029China School of Earth of Space Sciences Peking UniversityBeijing 100871China National Institute of Natural Hazards MEMCBeijing 100085China

On May 5, 2014, an earthquake with a magnitude of Mw 6.1(the largest earthquake in Thailand so far) occurred in Chiang Rai of the Golden Triangle area in northern Thailand. We had an opportunity to conduct field survey immediately after the earthquake. Serious damage to buildings and casualties of lives were observed, and the estimated Maximum Mercalli Intensity(MMI) of the earthquake is Ⅷ(evaluated according to the MMI scale of the Chinese Standard). No long continuous ground ruptures were produced during the earthquake, but in the epicenter(commonly within MMI Ⅷ extent), massive small linear ruptures(usually several tens of meters long) developed and displayed intriguing structural features, offsetting many roads several centimeters left laterally on NE trending cracks or offsetting right laterally on NW trending ones. The focal mechanism solution of earthquake shows that this is a pure strike-slip event, and two nodal planes in NW and NE directions had the same motion senses respectively as those of breakage associated with the earthquake. The long axis of the isoseismals and aftershock distributions are in NE direction,which is consistent with the strike of Luang Namtha fault. The 230-km-long Luang Namtha fault which starts from the border of China and Laos, runs through northern Laos, and terminates at Chiang Rai of Thailand is predominated by left-lateral strike-slip and active in late Quaternary, and two earthquakes over Ms 6.0 occurred along the fault in 1925 and 2007 respectively. This Mw 6.1 earthquake occurred at the southwestern end of the fault. All related features such as evident structural rupturing, elongated orientation of MMI and aftershock distribution,as well as the location of the epicenter,suggest that the Luang Namtha fault may be responsible for the 2014 Northern Thailand earthquake.

关键词： Mw 6.1 earthquake seismogenic tectonics Luang Namtha fault Indochina Block northern Thailand

Late Quaternary Activity of the Chuxiong-Nanhua Fault and the 1680 Chuxiong Ms6 3/4 Earthquake

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Earthquake Research in China 2017年第3期31卷 431-440页

作者： chang zufeng chang Hao Li Jianlin Earthquake Administration of Yunnan Province Kunming 650041China

In this paper,according to the results of the satellite imagery interpretation and field investigation,we study the active features and the latest active times of the ChuxiongNanhua fault,the Quaternary basins formation mechanism,and the relationship between the fault and the 1680 Chuxiong M_S6 3/4earthquake. Several Quaternary profiles at Lvhe,Nanhua reveal that the fault has offset the late Pleistocene deposits of the T2 and T3 terraces of Longchuan river, indicating that the fault was obviously active in late Quaternary. The Chuxiong-Nanhua fault has been dominated by dextral strike slip motion in the late Quaternary,with an average rate of 1. 6-2. 0 mm/a. Several pull apart Quaternary basins of Chuxiong,Nanhua,and Ziwu etc. have developed along the *** 1680 Chuxiong M_S6 3/4earthquake and several moderate earthquakes have occurred near the fault. The Chuxiong-Nanhua fault are the seismogenic structure of those earthquakes,the latest fault movement was in the late-Pleistocene,and even the *** large area,the Chuxiong-Nanhua fault and the eastern Qujiang fault and the Shiping fault composed a set of NW-trending oblique orientation active faults,and the motion characteristics are all mainly dextral strike slip. The motion characteristics,like the red river fault of the Sichuan-Yunnan Rhombic Block southwestern boundary,are concerned with the escaping movement of the Sichuan-Yunnan Rhombic Block.

关键词： The Chuxiong-Nanhua fault Late-Quaternary Dextral strike slip Earthquake

Differential Tectonic Stress Pattern Between the Deep and Shallow Crust in North China and Its Possible Genesis

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Earthquake Research in China 2000年第3期14卷 63-71页

作者： Liang Haihua Liu Shuwen Hou Jianjun chang zufeng Department of Geology Peking University Beijing 100871 China

This paper approaches the neotectonic stress field based on the data of foeal mechanismsolution,ground stress measurement,tectonic mechanical analysis and geodetic surveying,and finds out that the orientations of the maximum principal comproessive sterss patterns arequite discordant with different methods and the stress patterns are widely differnt betweenthose in the shallow and deep part of the crust in North *** on the analysis ofabove-mentioned data,we established a duplex model by considering the diversities of theStress patterns in 3-dimentional spaces,the boundary conditions and the lithospheric media,and made an inverse calculation by using the finite element *** calculated results fitwell with the reality in North China,*** stress patterns in lower crust which is below thedetachment interface at the deptp of 10 km from ground surface are relatively consistent withnearly horizontal state and NE-ENE trending of the maximum principal compressive stressaxes,whereas the stress

关键词： Duplex model of tectonic stress Detachment interface North China block

滇西北龙蟠—乔后断裂带桃源段晚第四纪活动特征研究

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地震工程学报 2022年第3期44卷 579-591页

作者：何付明常祖峰云南省水利水电勘测设计研究院云南昆明650021 云南省地震局云南昆明650224

根据详细的野外调查和剖面测绘成果,结合区域第四系测年结果等资料,对龙蟠—乔后断裂带桃源段新发现的桃源断裂、刀郭断裂、合江村断裂及已知的龙蟠—乔后断裂等4条主要断裂的晚第四纪活动特征进行研究。成果表明,龙蟠—乔后断裂带桃源... 详细信息

根据详细的野外调查和剖面测绘成果,结合区域第四系测年结果等资料,对龙蟠—乔后断裂带桃源段新发现的桃源断裂、刀郭断裂、合江村断裂及已知的龙蟠—乔后断裂等4条主要断裂的晚第四纪活动特征进行研究。成果表明,龙蟠—乔后断裂带桃源段在晚第四纪的活动特征明显,活动强度中等,龙蟠—乔后断裂和合江村断裂属全新世活动断裂,桃源断裂和刀郭断裂属晚更新世断裂;晚更新世以来,龙蟠—乔后断裂和刀郭断裂以左旋走滑运动为主,而桃源断裂和合江村断裂则表现为正断走滑为主。这些断裂的活动性都不同程度地影响着研究区及附近区域的地震风险和构造稳定性。新的调查研究成果为深入认识龙蟠—乔后断裂带桃源段的晚第四纪活动性提供了新的资料,并可为深入理解该区的地震地质特征以及工程建设地震安全性评价等提供基础地质资料。

关键词：龙蟠—乔后断裂带晚第四纪走滑断层活动断裂

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滇西南阿墨江断裂带与2018年墨江M5.9地震

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地质通报 2019年第6期38卷 967-976页

作者：常祖峰毛泽斌马保起代博洋云南省地震局云南昆明650041 中国地震局地壳应力研究所北京100085

野外调查表明,阿墨江断裂Ⅲ级夷平面和T4阶地上发育断层垭口,其下地貌面则无断层地貌显示;断层构造岩胶结紧密或呈半固结状,少有断层泥发育;SEM测年显示早更新世活动,断层泥ESR年龄为549±54ka,断层上覆中—上更新统残坡积土未被切穿或... 详细信息

野外调查表明,阿墨江断裂Ⅲ级夷平面和T4阶地上发育断层垭口,其下地貌面则无断层地貌显示;断层构造岩胶结紧密或呈半固结状,少有断层泥发育;SEM测年显示早更新世活动,断层泥ESR年龄为549±54ka,断层上覆中—上更新统残坡积土未被切穿或发生构造变形;说明该断裂带最新活动时代为早—中更新世。2018年墨江M5.9地震等震线长轴呈与断裂带走向一致的NW方向,指示此次地震的发震构造为阿墨江断裂带西支。受青藏高原物质向东南挤出的影响,震中所在的思茅块体作S向运动。虽然阿墨江断裂带晚第四纪无明显的地表活动迹象,但因该断裂带本身构成了宽阔的构造软弱带,在近SN向挤压应力场作用下,局部地区的应力集中仍可能导致新的破裂并触发类似墨江M5.9地震的中-强地震活动。从区域上看,云南还存在构造条件与之相似的断裂带,如滇东地区的弥勒-师宗断裂带,历史上沿该断裂带曾发生11次5级以上中-强地震。因此,在区域地震危险性评价中,还应该关注第四纪活动迹象不明显,但仍有潜在发震危险性的区域性大断裂。

关键词：阿墨江断裂带早-中更新世构造岩 M5.9级地震发震构造