姜思源,徐克科

• 1:河南理工大学测绘与国土信息工程学院

摘要(Abstract)：

为获取圣安德烈斯断裂Parkfield段的地壳形变特征，该文利用2001—2004年全球导航卫星系统(GNSS)观测数据，计算区域内5条基线时间序列，并提出多边形网的方法计算面应变参数，再利用GNSS站点速率进行剖面分析，研究了区域地壳形变的动态演变过程。结果表明，基线方向与断裂破裂方向越趋于一致，其长度变化对地震越灵敏；研究区域的地壳形变特征表现为E-W向拉张和NE-SW向压缩，与Parkfield段断裂EW方向上的右旋剪切应变相吻合；应变参数在震前发生加速、闭锁和反向加速的趋势异常变化，并且周期性变化趋势符合弹性回跳理论和凹凸体分布；反演所得的断层走滑速率为31.22 mm/a,且断裂带呈现出右旋走滑运动趋势。综合分析下，Parkfield段断裂呈现右旋走滑的长期趋势，并在Parkfield Mw6.0地震中产生右旋剪切构造动力的变化。

关键词(KeyWords)： 地壳形变;基线时间序列;应变参数;地震

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(41774041)

作者(Author): 姜思源,徐克科

DOI: 10.16251/j.cnki.1009-2307.2022.04.002

参考文献(References)：

• [1] 张国民，钮凤林，邵志刚.帕克菲尔德地震预报实验场：2004年6级地震及其对地震物理和地震预测研究的影响[J].中国地震，2009,25(4):345-355.(ZHANG Guomin,NIU Fenglin,SHAO Zhigang.The parkfield earthquake prediction experiment:2004 M6.0 earthquake and its impact on the earthquake physics and earthquake prediction study[J].Earthquake Research in China,2009,25(4):345-355.)
• [2] LANGBEIN J,BORCHERDT R,DREGER D,等.2004年9月28日加州帕克菲尔德M6.0级地震的初步报告[J].世界地震译丛，2005,36(4):14-31.(LANGBEIN J,BORCHERDT R,DREGER D,et al.Preliminary report on the 28 September 2004,M6.0 Parkfield,California earthquake[J].Translated World Seismology,2005,36(4):14-31.)
• [3] MURRAY J R,SEGALL P.Spatiotemporal evolution of a transient slip event on the San Andreas fault near Parkfield,California[J].Journal of Geophysical Research:Solid Earth,2005,110(B9).
• [4] MAURER J,JOHNSON K.Fault coupling and potential for earthquakes on the creeping section of the central San Andreas Fault[J].Journal of Geophysical Research:Solid Earth,2014,119(5):4414-4428.
• [5] 何子晨，冯威，朱东伟.圣安地列斯断裂带帕克菲尔德段异常运动及其特征分析[J].四川地震，2019(1):27-31.(HE Zichen,FENG Wei,ZHU Dongwei.Anomalous movement and its characteristics in the parkfield segment of the San andreas fault[J].Earthquake Research in Sichuan,2019(1):27-31.)
• [6] SHAKAL A,GRAIZER V,BORCHERDT R,et al.2004年9月28日加州帕克菲尔德地震强地面运动记录的初步分析[J].世界地震译丛，2005,36(4):32-45.(SHAKAL A,GRAIZER V,BORCHERDT R,et al.Preliminary analysis of strong-motion recording from the 28 September 2004 Parkfield,California earthquake[J].Translated World Seismology,2005,36(4):32-45.)
• [7] 张风霜，占伟，孙东颖.2011年日本9.0级地震前后GPS基线时间序列分析[J].地震研究，2012,35(2):190-200.(ZHANG Fengshuang,ZHAN Wei,SUN Dongying.Analysis of GPS baseline time series before and after tohoku-Oki Mw9.0 earthquake in Japan in 2011[J].Journal of Seismological Research,2012,35(2):190-200.)
• [8] 侯争，郭增长，杜久升，等.芦山地震前后川滇地区地壳水平形变特征研究[J].测绘科学，2021,46(2):1-6.(HOU Zheng,GUO Zengzhang,DU Jiusheng,et al.Reseach on the horizontal deformation characteristics of the Sichuan-Yunnan region before and after the Lushan earthquake[J].Science of Surveying and Mapping,2021,46(2):1-6.)
• [9] 马海萍，张辉，冯建刚，等.2019年夏河Ms5.7地震前应力应变变化特征研究[J].地球物理学进展，2021,36(3):933-939.(MA Haiping,ZHANG Hui,FENG Jiangang,et al.Characteristics of the stress-strain variation before the 2019 Xiahe Ms5.7 earthquake[J].Progress in Geophysics,2021,36(3):933-939.)
• [10] 顾国华，王武星.GPS观测得到的大地震前兆地壳形变震例[J].地震科学进展，2020,50(10):30-39.(GU Guohua,WANG Wuxing.Case studies on GPS observations and crustal deformation precursors to strong earthquakes[J].Progress in Earthquake Sciences,2020,50(10):30-39.)
• [11] 闫伟，牛安福，马秀香，等.以昆仑山口西地震为例研究GPS基线长度与方向对地震的敏感性[J].地震，2007,27(4):85-90.(YAN Wei,NIU Anfu,MA Xiuxiang,et al.Taking Kunlun Mountain Earthquake as example to research the sensibility of earthquake to GPS baseline length and direction[J].Earthquake,2007,27(4):85-90.)
• [12] 刘延斌，凡春明，陈永立.投影变形对坐标转换精度的影响[J].测绘与空间地理信息，2014,37(7):184-186.(LIU Yanbin,FAN Chunming,CHEN Yongli.Projection deformation influence on the precision of coordinate transformation[J].Geomatics & Spatial Information Technology,2014,37(7):184-186.)
• [13] 徐克科，李伟.利用GNSS基线分析芦山Ms7.0级地震前后应变演变特征[J].武汉大学学报(信息科学版),2017,42(8):1054-1060.(XU Keke,LI Wei.Strain evolution characteristics before and after Lushan Ms7.0 Earthquake using GNSS baseline[J].Geomatics and Information Science of Wuhan University,2017,42(8):1054-1060.)
• [14] 伍吉仓，邓康伟，陈永奇.用边长变化结果计算地应变及块体划分[J].大地测量与地球动力学，2002,22(4):35-38.(WU Jicang,DENG Kongwei,CHEN Yongqi.Strain calculation based on baseline length changes and division of tectonic blocks[J].Crustal Deformation and Earthquake,2002,22(4):35-38.)
• [15] 许雅儒.集集地震之震前、同震及震后变形模式研究[D].南京：国立中央大学，2004:23-24.(XU Yaru.Modeling studies on interseismic,coseismic and postseismic deformations associated with the 1999 Chi-Chi,Taiwan earthquake[D].Nanjing:National Central University,2004:23-24.)
• [16] 王乐洋.川滇地区地壳应变率参数的总体最小二乘反演[J].测绘工程，2016,25(1):5-9.(WANG Leyang.Inversion of crustal strain rate parameters in Sichuan-Yunnan region based on total least squares[J].Engineering of Surveying and Mapping,2016,25(1):5-9.)
• [17] 张永志，赵大江，王卫东，等.利用GPS观测研究中国西北地区应变能变化特征[J].大地测量与地球动力学，2007,27(3):1-5.(ZHANG Yongzhi,ZHAO Dajiang,WANG Weidong,et al.Characteristics of strain energy variation from GPS data in northwestern China[J].Journal of Geodesy and Geodynamics,2007,27(3):1-5.)
• [18] 吕志鹏，伍吉仓，孟国杰，等.青藏高原东缘地应变空间分布特征分析[J].大地测量与地球动力学，2014,34(1):19-23.(LYU Zhipeng,WU Jicang,MENG Guojie,et al.Analysis of spatial distribution of strain at eastern margin of Tibetan Plateau[J].Journal of Geodesy and Geodynamics,2014,34(1):19-23.)
• [19] 葛永慧.测量平差基础[M].2版.北京：煤炭工业出版社，2015.(GE Yonghui.Foundation of survey adjustment[M].2nd ed.Beijing:China Coal Industry Publishing House,2015.)
• [20] 江在森，马宗晋，牛安福，等.GPS技术应用于中国地壳运动研究的方法及初步结果[J].地学前缘，2003,10(1):71-79.(JIANG Zaisen,MA Zongjin,NIU Anfu,et al.Approaches and preliminary results of crust movement researches based on the GPS in China[J].Earth Science Frontiers,2003,10(1):71-79.)
• [21] 瞿伟，高源，陈海禄，等.利用GPS高精度监测数据开展青藏高原现今地壳运动与形变特征研究进展[J].地球科学与环境学报，2021,43(1):182-204.(QU Wei,GAO Yuan,CHEN Hailu,et al.Review on characteristics of present crustal tectonic movement and deformation in Qinghai-Tibet plateau,China using GPS high precision monitoring data[J].Journal of Earth Sciences and Environment,2021,43(1):182-204.)
• [22] 陈晓利，单新建，张凌，等.地震诱发滑坡的快速评估方法研究：以2017年Ms7.0级九寨沟地震为例[J].地学前缘，2019,26(2):312-320.(CHEN Xiaoli,SHAN Xinjian,ZHANG Ling,et al.Quick assessment of earthquake-triggered landslide hazards:a case study of the 2017 Ms7.0 Jiuzhaigou earthquake[J].Earth Science Frontiers,2019,26(2):312-320.)
• [23] 吴伟伟，孟国杰，苏小宁，等.基于高斯距离加权格网法研究华北地区地壳形变特征[J].大地测量与地球动力学，2015,35(1):7-12.(WU Weiwei,MENG Guojie,SU Xiaoning,et al.Crustal deformation of the north China district from GPS measurements based on Gaussian distance weighting grids method[J].Journal of Geodesy and Geodynamics,2015,35(1):7-12.)
• [24] 江在森，武艳强，方颖，等.汶川8.0级地震前区域地壳运动与应变场动态特征[J].地震，2009,29(1):68-76.(JIANG Zaisen,WU Yanqiang,FANG Ying,et al.Dynamic characteristics of the strain fields and crustal movements before the Wenchuan Ms8.0 earthquake[J].Earthquake,2009,29(1):68-76.)
• [25] 周军，李文超.利用GPS研究当前鄂尔多斯地块周缘地壳变形状态[J].地震地磁观测与研究，2017,38(1):88-95.(ZHOU Jun,LI Wenchao.Research on recent deformation characteristics around Ordos massif using CMONOC GPS reference station data[J].Seismological and Geomagnetic Observation and Research,2017,38(1):88-95.)
• [26] SCHORLEMMER D.Earthquake statistics at Parkfield:1.Stationarity of b values[EB/OL].(2004-12-23) [2021-07-11].http://bemlar.ism.ac.jp/zhuang/Refs/Refs/schorlemmer05jgr1.pdf.
• [27] SAVAGE J C,BURFORD R O.Geodetic determination of relative plate motion in central California[J].Journal of Geophysical Research Atmospheres,1973,78(5):832-845.
• [28] JONES C H,WESNOUSKY S G,耿杰.圣安德烈斯断层系的滑动速率和强度变化[J].地震地质译丛，1993,15(5):40-45.(JONES C H,WESNOUSKY S G,GENG Jie.The slip rate and strength changes of the San Andreas fault[J].Translated Seismology and Geology,1993,15(5):40-45.)
• [29] MAURER J,JOHNSON K.Fault coupling and potential for earthquakes on the creeping section of the central San Andreas fault[J].Journal of Geophysical Research:Solid Earth,2014,119(5):4414-4428.
• [30] CATCHINGS R D,RYMER M J,GOLDMAN M R,等.加利福尼亚帕克菲尔德米德尔山圣安德烈斯断层带的高分辨率地震速度和浅层结构[J].世界地震译丛，2004,35(1):52-62.(CATCHINGS R D,RYMER M J,GOLDMAN M R,et al.High-resolution seismic velocities and shallow structure of the San Andreas fault zone at Middle Mountain,Parkfield,California[J].Translated World Seismology,2004,35(1):52-62.)
• [31] 李英杰，延军平，唐宝琪，等.美国圣安德烈斯断裂带强震活动规律及未来趋势研讨[J].中国地质灾害与防治学报，2016,27(4):56-63.(LI Yingjie,YAN Junping,TANG Baoqi,et al.Tendency judgement of Mw≥6.8 earthquake in San Andreas fault[J].The Chinese Journal of Geological Hazard and Control,2016,27(4):56-63.)