| 西南天山地区长时间尺度重力场变化特征 |
| |
| 引用本文： | 艾力夏提&#;玉山,刘代芹,李杰,李桂荣,陈丽,朱治国,阿卜杜塔伊尔&#;亚森,李瑞.西南天山地区长时间尺度重力场变化特征[J].震灾防御技术,2018,13(2):388-398. |
| |
| 作者姓名： | 艾力夏提&#;玉山 刘代芹 李杰 李桂荣 陈丽 朱治国 阿卜杜塔伊尔&#;亚森 李瑞 |
| |
| 作者单位： | 新疆维吾尔自治区地震局, 乌鲁木齐 830011 |
| |
| 基金项目： | 新疆维吾尔自治区自然科学基金（2016D01A062）;2017年度震情跟踪定向工作任务（2017020202、2017010204）;新疆地震科学基金（201612、201613）;地震科技星火计划（XH16042Y、XH17044） |
| |
| 摘 要： | 利用西南天山地区2007至2016年共20期流动重力观测资料,分析该地区一年、两年尺度和累积重力变化特征,探讨区域构造活动、地震孕育发生与重力场变化特征的关系。结果表明:西南天山地区迈丹断裂带、柯坪塔格断裂带等大型断裂带影响该区域的重力场分布,使该地区较多出现NEE向的重力梯度分布特征。塔里木盆地和西南天山重力变化有明显的差异性,2个不同的构造块体在重力分布上呈现相对反向变化,塔里木盆地和西南天山地区的重力变化界线不在塔里木盆地边缘的山前地带,而较多出现在柯坪推覆体中北缘地带。西南天山地区的地震大部分发生在重力正值变化区域的零线附近,震中及附近地区重力异常分布与构造特征有较好的一致性。在活动断裂带附近同时出现重力变化零线以及与断裂走向一致的重力变化高梯度带,可作为中短期前兆异常。
|
| 关 键 词： | 西南天山 流动重力 重力异常 |
| 收稿时间： | 2017/11/13 0:00:00 |
Variation Characteristics of Long Period Gravity Field in Southwestern Tianshan |
| |
| Ailixiati&#;Yushan,Liu Daiqin,Li Jie,Li Guirong,Chen Li,Zhu Zhiguo,Abudutayier&#;Yasen and Li Rui.Variation Characteristics of Long Period Gravity Field in Southwestern Tianshan[J].Technology for Earthquake Disaster Prevention,2018,13(2):388-398. |
| |
| Authors: | Ailixiati&#;Yushan Liu Daiqin Li Jie Li Guirong Chen Li Zhu Zhiguo Abudutayier&#;Yasen and Li Rui |
| |
| Institution: | Earthquake Agency of Xinjiang Uyghur Autonomous Region, Urumqi 830011, China |
| |
| Abstract: | By using the 20-year data observed from 2007 to 2016, we analyzed the gravitational variations characteristics of in one and two year scale in the southwestern Tianshan area, in order to study the relationship between gravitational field changes to structural features, generation and occurrence of earthquakes. Our results show that the regional faults such as Maidan fault and Kepingtage fault, have great effect on the gravitational field distribution in southwestern Tianshan area, resulting in the preferred NEE direction of gravitational gradient distribution. There exists obvious difference of gravitational change between northwestern Tianshan and Tarim basin, in which the two different structural blocks have opposite changes in gravitational field. The boundary of gravitational change between Tarim basin and southwestern Tianshan mostly lays on the middle-north part of Keping nappe instead of in the edge of Tarim basin. There exists a consistency between gravitational anomalies and structural distribution where the earthquakes in the southwestern Tianshan area mainly along the positive gravity change zone with near zero line. Such local anomalies can be taken as the mediate-short term precursor of earthquakes in the region. |
| |
| Keywords: | Southwestern Tianshan Mobile gravity Gravitational anomaly |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《震灾防御技术》浏览原始摘要信息 |
| 点击此处可从《震灾防御技术》下载免费的PDF全文 |
|
