为研究鄂尔多斯周缘地区中强地震发生前地震矩加速释放时空特征，选取去丛集后的地震目录，基于地震矩释放程度m值，对1981年以来鄂尔多斯周缘地区10例MS≥5.5中强地震进行二维时空扫描，提取与地震矩加速释放特征相关的时空尺度作为矩释放程度时空扫描模型参数，以3个月为扫描步长，对震前12个月m值及累积Benioff应变释放进行拟合计算。结果显示，震前破裂成核点附近存在显著的AMR现象，7次震例存在累积Benioff应变加速释放特征，说明鄂尔多斯周缘地区MS≥5.5地震发生前AMR现象存在一定普遍性，应用矩加速时空扫描方法具有一定优势，但仍需结合其他方法进行综合分析。
To study the spatial and temporal characteristics of Accelerating Moment Release (AMR) before moderate earthquakes in the peripheral area of Ordos, 10 MS ≥ 5.5 moderate earthquakes that occurred in the research area since 1981 were selected from an earthquake catalog after removing earthquake clusters and scanned in two dimensions based on the moment release m. The spatiotemporal scales related to accelerating release characteristics of seismic moments were extracted as the input parameters for the spatiotemporal scan model of moment release degree, and the m values and accumulated Benioff strain release 12 months before the earthquake were fitted using 3 months as the scan step. The results show that there is a significant AMR phenomenon near the nucleation point of the rupture before the earthquake, and there are accelerating release characteristics of the cumulative Benioff strain in 7 earthquakes, indicating that the AMR phenomenon is universal before moderate earthquakes with MS ≥ 5.5 in the peripheral area of Ordos. The method has certain advantages, but it is still needed to combine with other methods for comprehensive analysis.
2020,41(3): 12-22 收稿日期：2019-10-29
DOI：10.3969/j.issn.1003-3246.2020.03.002
基金项目：陕西省地震局启航与创新基金（项目编号：QC201926）
作者简介：冯亮亮(1982-),男,硕士研究生,陕西宝鸡人,工程师,主要从事地震活动性分析与监测预报工作。E-mail:fll-0919@163.com
参考文献：
冯建刚,蒋长胜,韩立波,等. 甘肃测震台网监测能力及地震目录完整性分析[J]. 地震学报,2012,34(5):646-685.
蒋长胜,吴忠良,史勇军. 中强震前地震活动矩释放加速现象(AMR)的普遍性问题[J]. 中国地震,2004,20(2):119-125.
蒋长胜,吴忠良. 强震前的"加速矩释放"(AMR)现象:对一个有争议的地震前兆的回溯性震例研究[J]. 地球物理学报,2009,52(3):691-702.
李霞,蒋长胜,闫德桥,等. 1989年以来华北地区中强震前地震矩加速释放空间扫描特征的研究[J]. 地震研究,2015,38(3):359-369.
李宇彤,蒋长胜. 东北第五活跃期中强震前的矩释放空间扫描特征研究[J]. 地震学报,2010,32(6):680-695.
苗青壮,蒋海昆. 地震临界现象及相关尺度增长定量检测方法研究综述[J]. 地震,2008,28(2):79-86.
杨文政,马丽. 地震活动加速模型及其在中国的应用[J]. 地震学报,1999,21(1):32-41.
杨文政,Jones D V,马丽,等. 一个关于临界地震的临界区域判别的方法[J]. 地震,2000,20(4):28-38.
张培震,邓启东,张国民,等. 中国大陆的强震活动与活动地块[J]. 中国科学:地球科学,2003,33(Z1):12-20.
张培震,邓启东,张竹琪,等. 中国大陆的活动断裂、地震灾害及其动力过程[J]. 中国科学:地球科学,2013,43(10):1 607-1 620.
左兆荣,张国民,吴建平. 1976年云南龙陵7.4级地震序列分析[J]. 地球物理学报,1996,39(5):653-659.
Ben-Zion Y, Eneva M, Liu Y F. Large earthquake cycles and intermittent criticality on heterogeneous faults due to evolving stress and seismicity[J]. J Geophys Res Solid Earth, 2003, 108(B6):2307, doi:10.1029/2002JB002121.
Bowman D D, Ouillon G, Sammis C G, et al. An observational test of the critical earthquake concept[J]. J Geophys Res Solid Earth, 1998, 103(B10):24 359-24 372.
Brehm D J, Braile L W. Intermediate-term earthquake prediction using the modified time-to-failure method in Southern California[J]. Bull Seismol Soc Amer, 1999, 89(1):275-293.
Bufe C G, Varnes D J. Predictive modeling of the seismic cycle of the Greater San Francisco Bay Region[J]. J Geophys Res Solid Earth, 1993, 98(B6):9 871-9 883.
Bufe C G, Nishenko S P, Varnes D J. Seismicity trends and potential for large earthquakes in the Alaska-Aleutian region[J]. Pure Appl Geophys, 1994, 142(1):83-99.
Gardner J K, Knopoff L. Is the sequence of earthquakes in Southern California, with aftershocks removed, Poissonian?[J]. Bull Seismol Soc Amer, 1974, 64(5):1 363-1 367.
Gross S J, Rundle J B. A systematic test of time-to-failure analysis[J]. Geophys J Int, 1998, 133(1):57-64.
Jiang C S, Wu Z L. Benioff strain release before earthquakes in China:accelerating or not?[J]. Pure Appl Geophys, 2006, 163(9):1 965-1 976.
Kanamori H. The energy release in Great earthquakes[J]. J Geophys Res, 1977, 82(B20):2 981-2 987.
Main I G. Earthquakes as critical phenomena:implications for probabilistic seismic hazard analysis[J]. Bull Seismol Soc Amer, 1995, 85(5):1 299-1 308.
Sornette D, Sammis C G. Complex critical exponents from renormalization group theory of earthquakes:implications for earthquake predictions[J]. J Phys I, 1995, 5(5):607-619.
Varnes D J. Predicting earthquakes by analyzing accelerating precursory seismic activity[J]. Pure Appl Geophys, 1989, 130(4):661-686.
Vere-Jones D. Statistical theories of crack propagation[J]. Math Geol, 1977, 9(5):455-481.
