Characteristics of Surface Rupture of the Ludian MS 6.5 Earthquake in Yunnan Province
-
摘要: 北京时间2014年8月3日16时30分，云南省鲁甸县发生了MS 6.5地震，本次地震的发震构造为包谷垴-小河断裂。野外调查发现，王家坡不稳定斜坡上的地表破裂在整个破裂带中比较具有代表性，其地表破裂带整体走向N45°W-N50°W，并且由剪切破裂、张剪切破裂、压剪切破裂、张性破裂以及鼓包等典型地表破裂组成。其中左、右地表破裂边界与发震断层的出露位置一致，由断层错动造成；而部分地表破裂与断层的位置不重合，其成因分为2种，一种是发震断层导致的一些次级地表破裂，另一种是地震引发的滑坡后缘破裂。地表破裂类型和基本组合特征显示出王家坡潜在不稳定斜坡上的地表破裂带具有左旋走滑的性质。Abstract: At 16:30 on August 3, 2014, MS 6.5 earthquake occurred in Ludian County, Yunnan Province, and the Baogunao-Xiaohe Fault is the causative structure of this earthquake. Through the field investigation, we found that the surface rupture on Wangjia slope is of typical characteristics of the earthquake, with the surface fracture zone overall trending N45°W-N50°W fracture zone and consisting of shear cracks, transtensional cracks, transpressional cracks, tension cracks and mole tracks. The boundary between the left and the right surface rupture is consistent with the location of the fault, and is caused by the fault movement. The partial surface rupture segment is not coincident with the location of the fault, which could be caused by the following two reasons. The first is that the seismogenic fault results in some secondary surface ruptures, and the second is that the seismogenic fault produces the earthquake landslide trailing edge fracture. The surface rupture types and basic characteristics indicate that the zone is characterized by left-lateral strike-slip mode.
-
Key words:
- Ludian earthquake /
- Earthquake surface rupture /
- Rupture characteristics /
- Cause analysis
-
图 2 2014年8月3日云南省鲁甸MS 6.5地震构造及等烈度图
Figure 2. Earthquake intensity contour lines of the Ludian "8·03" earthquake in Yunnan Provinc
图 3 地震地表破裂分布（右图为左图黑框区域的放大图）
Figure 3. Distribution of surface rupture of the earthquake
-
民政部国家减灾中心, 2014.云南省鲁甸县6.5级地震.中国减灾, 15(8):40-41. http://www.cnki.com.cn/Article/CJFDTOTAL-ZGJI201415014.htm 陈兴长, 胡凯衡, 葛永刚等, 2015.云南鲁甸" 8·03"地震地表破裂与大型地震滑坡.山地学报, 33(1):65-71. http://www.cnki.com.cn/Article/CJFDTOTAL-SDYA201501009.htm 董彦芳, 袁小祥, 王晓青等, 2012. 2010年青海玉树MS 7.1地震地表破裂特征的高分辨率遥感分析.地震, 32(1):82-92. http://www.cnki.com.cn/Article/CJFDTOTAL-DIZN201201008.htm 李海兵, 潘家伟, 孙知明等, 2015. 2014年于田MS 7.3地震地表破裂特征及其发震构造.地质学报, 89(1):180-194. http://www.cnki.com.cn/Article/CJFDTOTAL-DZDZ200803003.htm 李西, 张建国, 谢英情等, 2014.鲁甸MS 6.5地震地表破坏及其与构造的关系.地震地质, 36(4):1280-1291. http://www.cnki.com.cn/Article/CJFDTOTAL-DZDZ201404026.htm 刘爱文, 帅向华, 吕红山等, 2014.鲁甸地震生命线工程震害特点及应急抢修.震灾防御技术, 9(3):359-367. http://zzfy.eq-j.cn/zzfyjs/ch/reader/view_abstract.aspx?flag=1&file_no=20140303&journal_id=zzfyjs 罗文行, 钱莉莉, 李德威等, 2015.地震地表破裂成因分析——以玉树地震为例.人民长江, 46(15):69-73. http://www.cnki.com.cn/Article/CJFDTOTAL-RIVE201515017.htm 帅向华, 姜立新, 侯建盛等, 2014.云南鲁甸6.5级地震灾害特点浅析.震灾防御技术, 9(3):340-358. http://zzfy.eq-j.cn/zzfyjs/ch/reader/view_abstract.aspx?flag=1&file_no=20140302&journal_id=zzfyjs 孙鑫喆, 徐锡伟, 陈立春等, 2010.青海玉树MS 7.1地震两个典型地点的地表破裂特征.地震地质, 32(2):338-344. http://www.cnki.com.cn/Article/CJFDTOTAL-DZDZ201002018.htm 孙鑫喆, 徐锡伟, 陈立春等, 2012. 2010年玉树地震地表破裂带典型破裂样式及其构造意义.地球物理学报, 55(1):155-170. http://www.cnki.com.cn/Article/CJFDTOTAL-DQWX201201016.htm 王腾文, 李勇, 李敬波等, 2015.包谷垴-小河断裂——2014年8月3日云南鲁甸MS 6.5地震发震构造.防灾科技学院学报, 17(2):1-7. http://www.cnki.com.cn/Article/CJFDTOTAL-FZJS201502001.htm 张桂芳, 屈春燕, 单新建等, 2011. 2010年青海玉树MS 7.1级地震地表破裂带和形变特征分析.地球物理学报, 54(1):121-127. http://www.cnki.com.cn/Article/CJFDTOTAL-DQWX201101012.htm 周春景, 吴中海, 尼玛次仁等, 2014.青海玉树MS 7.1级地震同震地表破裂构造.地质通报, 33 (4):551-566. http://www.cnki.com.cn/Article/CJFDTOTAL-ZQYD201404011.htm Xu X. W., Yu G. H., Klinger Y., et al., 2006. Reevaluation of surface rupture parameters and faulting segmentation of the 2001 Kunlunshan earthquake (MW 7.8), northern Tibetan Plateau, China. Journal of Geophysics Research, 111(B5):B05316, doi: 10.1029/2004JB003488. Yeats R. S., Sieh K., Allen C. R., 1997. The geology of earthquakes. Oxford:Oxford University Press, 568. http://thedayaftertomorrow.net/f47/The-Geology-of-Earthquakes.pdf Zhang Y., Xu L. S., Chen Y. T., 2010. Source process of the 2010 Yushu, Qinghai, earthquake. Science China Earth Sciences, 53(9):1249-1251. doi: 10.1007/s11430-010-4045-5. -
下载:
点击查看大图
图(5)
计量
- 文章访问数: 83
- HTML全文浏览量: 4
- PDF下载量: 9
- 被引次数: 0
