1556年华县地震地表破裂带同震垂直位移

doi:10.3969/j.issn.0253-4967.2016.01.002

地震地质 ›› 2016, Vol. 38 ›› Issue (1): 22-30.DOI: 10.3969/j.issn.0253-4967.2016.01.002

1556年华县地震地表破裂带同震垂直位移

马冀^1,2, 冯希杰², 李高阳², 李晓妮², 张艺²

1. 中国地震局地质研究所, 活动构造与火山重点实验室, 北京 100029;
2. 陕西省地震局, 西安 710068

收稿日期:2016-02-29 出版日期:2016-03-20 发布日期:2016-05-17
作者简介:马冀,女,1984年生,中国地震局地质研究所在读博士研究生,工程师,主要从事活动构造与新构造研究,电话:029-88465334,E-mail:jima.geo@gmail.com。
基金资助:
国家自然科学基金青年科学基金(41502205)资助

THE COSEISMIC VERTICAL DISPLACEMENTS OF SURFACE RUPTURE ZONE OF THE 1556 HUAXIAN EARTHQUAKE

MA Ji^1,2, FENG Xi-jie², LI Gao-yang², LI Xiao-ni², ZHANG Yi²

1. State Key Laboratory of Active Tectonics and Volcano, Institute of Geology, China Earthquake Administration, Beijing 100029, China;
2. Earthquake Administration of Shaanxi Province, Xi'an 710068, China

Received:2016-02-29 Online:2016-03-20 Published:2016-05-17

摘要/Abstract

摘要：

同震位移量作为地震地表破裂带的要素之一,其大小不仅反映了地震的震级,而且也影响到对地震断层滑动速率和大震重现间隔长短的估计。1556年华县8级地震造成了83万多人的死亡和失踪,是鄂尔多斯周缘断陷活动带活跃期造成地震灾害伤亡最严重的1次地震,但长期以来缺少该次地震地表破裂带准确的同震位移量。文中通过对华山山前断裂李家坡剖面和渭南塬前断裂蔡郭村等剖面地貌学、钻探及探槽等古地震研究手段,首次较准确地获得了1556年华县大地震时华山山前断裂带华县李家坡6m同震垂直位移、渭南塬前断裂带赤水蔡郭村7m及瓜底村6m的同震垂直位移。这是由断层两盘同一地层位错量测得到的同震垂直位移量,与以往仅通过地表断层陡坎量测估算的同震位移有一定的差别。

关键词: 1556年华县地震, 同震垂直位移, 华山山前断裂, 渭南塬前断裂

Abstract:

Coseismic displacement plays a role in earthquake surface rupture, which not only reflects the magnitude scale but also has effect on estimates of fault slip rate and earthquake recurrence intervals. A great historical earthquake occurred in Huaxian County on the 23^rd January 1556, however, there was lack of surface rupture records and precise coseismic vertical displacements. It's known that the 1556 Huaxian earthquake was caused by Huashan front fault and Weinan plateau front fault, which are large normal faults in the east part of the southern boundary faults in Weihe Basin controlling the development of the basin in Quaternary. Here, we made a study on three drilling sites in order to unveil the coseismic vertical displacements.
It is for the first time to get the accurate coseismic vertical displacements, which is 6m at Lijiapo site of Huashan front fault, 7m at Caiguocun site, and 6m at Guadicun site of Weinan plateau front fault. These coseismic displacements measured based on same layers of drilling profiles both at footwall and hanging wall are different from the results measured by former geomorphological fault scarps. It's estimated that some scarps are related with the nature reformation and the human beings' activities, for example, fluviation or terracing field, instead of earthquake acticity, which leads to some misjudgment on earthquake displacements. Moreover, the vertical displacements from the measurement of geomorphological scarps alone do not always agree with the virtual ones. Hence, we assume that the inconsistency between the results from drilling profiles and geomorphological scarps in this case demonstrates that the fault scarp surface may have been demolished and rebuilt by erosion or human activities.

Key words: 1556 Huaxian earthquake, coseismic vertical displacement, Huashan front fault, Weinan plateau front fault

中图分类号:

P315.2

马冀, 冯希杰, 李高阳, 李晓妮, 张艺. 1556年华县地震地表破裂带同震垂直位移[J]. 地震地质, 2016, 38(1): 22-30.

MA Ji, FENG Xi-jie, LI Gao-yang, LI Xiao-ni, ZHANG Yi. THE COSEISMIC VERTICAL DISPLACEMENTS OF SURFACE RUPTURE ZONE OF THE 1556 HUAXIAN EARTHQUAKE[J]. SEISMOLOGY AND GEOLOGY, 2016, 38(1): 22-30.

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1556年华县地震地表破裂带同震垂直位移

THE COSEISMIC VERTICAL DISPLACEMENTS OF SURFACE RUPTURE ZONE OF THE 1556 HUAXIAN EARTHQUAKE

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