| 福建地壳运动与地震关系初探 |
| |
| 引用本文： | 刘芳，孙冬军，周一剑，朱艾斓，魏薇，朴健. 2023. 基于自动检测方法的福建地区断裂带地震活动性研究. 地震学报，45（3）：538−549. DOI: 10.11939/jass.20220188 |
| |
| 作者姓名： | 刘芳 孙冬军 周一剑 朱艾斓 魏薇 朴健 |
| |
| 作者单位： | 1.中国上海 200062 上海市地震局;2.中国上海 200062 上海佘山地球物理国家野外科学观测研究站;3.美国加利福尼亚州滨河 92521 加州大学滨河分校地球科学学院;4.中国北京 100087 北京大学地球与空间科学学院 |
| |
| 基金项目： | 上海佘山地球物理国家野外科学观测研究站海洋地震观测研究室课题（2021SSY01）资助 |
| |
| 摘 要： | 利用福建地震台网88个地震台站于2015年记录的10个月的连续波形数据，基于台网约束下的长短窗特征触发式震相检测的模板事件识别方法和匹配滤波自动检测方法，识别出模板事件919个，匹配滤波后重新识别和定位了共计2 243个地震事件，其中ML1.0以上地震1 991次，主要集中在ML1.0—1.5之间，这极大扩充了该震级范围内的福建地震台网目录。重新定位的地震震源深度分布在0—20 km之间，多数发生在10 km内的上地壳。沿长乐—诏安断裂带和永安—晋江断裂带，地震分布集中且表现出明显的分段活动性。在长乐—诏安断裂带上检测到较福建台网目录更多的地震，且地震活动性表现为西南段较强、东北段较弱，沿断裂带的震源深度分布由南向北逐渐变浅，与莫霍面深度的变化相一致；在与之共轭的永安—晋江断裂带上则北西段地震活动更为集中，而东南段地震活动稍显分散。重新识别与精定位后的地震与福建地区地壳水平形变南强北弱、东强西弱的特点相一致。
|
| 关 键 词： | 自动地震检测方法 长乐—诏安断裂带 永安—晋江断裂带 地震活动性 |
| 收稿时间： | 2022-10-07 |
| 修稿时间： | 2022-12-25 |
Study on the relationship between crustal movement and seismicity in Fujian area |
| |
| Liu F，Sun D J，Zhou Y J，Zhu A L，Wei W，Piao J. 2023. Seismicity characteristics of fault zones in Fujian area based on automatic seismic detection method. Acta Seismologica Sinica，45（3）：538−549. DOI: 10.11939/jass.20220188 |
| |
| Authors: | Liu Fang Sun Dongjun Zhou Yijian Zhu Ailan Wei Wei Piao Jian |
| |
| Affiliation: | 1.Shanghai Earthquake Agency，Shanghai 200062，China;2.Shanghai Sheshan National Geophysical Observatory，Shanghai 200062，China;3.Department of Earth Sciences，University of California，Riverside，California 92521，USA;4.School of Earth and Space Sciences，Peking University，Beijing 100871，China |
| |
| Abstract: | Driven by the tectonic loading of Taiwan and Taiwan Strait, there are several large Quaternary fracture zones in the Fujian area, with strong historical and current seismicity. We build a comprehensive seismic catalog with a new automatic workflow called PALM （phase picking, association, location, matched filter）, which combines STA/LTA and matched filter. PALM is applied to 10 month’s continuous data in 2015 of 88 stations from the Fujian Earthquake Agency. We recognized 919 template events and finally relocated 2 243 events after matching filter, among which 1 991 events with magnitude greater than ML1.0, and it greatly expanded the catalog from Fujian Earthquake Agency in the range of ML1.0−1.5. The depth of relocated earthquake events are distributed between 0 and 20 km, with most of them occurred within 10 km. The events are concentrated along Changle-Zhao’an fault zone and Yong’an-Jinjiang fault zone and showed obvious segmental activity. We detected more earthquakes than the catalog from Fujian Earthquake Agency, and the seismicity was stronger in the southwest section and weaker in the northeast section. The depth distribution along the fault zone became shallower from south to north, which was consistent with the change of Moho depth. Besides, we can see a highly clustered feature of seismicity at northwest section and slightly dispersed at southeast segment in Yong’an-Jinjiang fault zone, which forms a conjugate shape with Changle-Zhao’an fault zone. The repicked and relocated events in Fujian area was consistent with the characteristics of horizontal crustal deformation, which was stronger in south and east while weaker in north and west. |
| |
| Keywords: | automatic seismic detection method Changle-Zhao’an fault zone Yong’an-Jinjiang fault zone seismicity |
|
| 点击此处可从《地震学报》浏览原始摘要信息 |
|
点击此处可从《地震学报》下载全文 |
