选取2009—2018年江苏省射阳地震台200 km范围内ML≥2.0地震波形资料，基于Sato单次散射模型，计算该区域S波尾波Qc值，并探求其时间变化特征。采用相同方法计算盐城、灌云地震台地震波形资料尾波Qc值，并将3个地震台的计算结果进行对比。结果表明：射阳地区是江苏省尾波Q0低值区域，Qc值随频率的变化关系为Qc （f）=33.7±3.4f 1.16±0.04；在2016年10月20日射阳ML 4.8地震前，射阳地区尾波Qc值有增大现象，Qc值变化特征表现为上升—下降—上升—发震；盐城、射阳、灌云地震台所记录地震的尾波Qc值在震前均出现明显的高值异常变化。
Based on the single scattering model (Sato), S-wave coda Qc values are calculated using a fixed elapsed time of 30 s for seismic waveforms recorded at the Sheyang seismic station in Jiangsu Province for ML ≥ 2.0 earthquakes that occurred from 2009 to 2018 and located within 200 km, and their temporal variation characteristics are explored. By the same method, coda Qc values for Yancheng and Guanyun seismic stations are calculated and the results of the three seismic stations are compared. The results show that the sheyang area is a relatively low coda Q0 region and the relation between Qc value and frequency is Qc(f)=33.7±3.4f 1.16±0.04. Before the Sheyang ML 4.8 earthquake on October 20, 2016, the value of coda Qc increased in the Sheyang area. The variation pattern of coda Qc value is up-down-up before the earthquake. The coda Qc values at Yancheng, Sheyang and Guanyun seismic stations all showed obvious high-value abnormal changes before the earthquake.
2021,42(3): 46-54 收稿日期：2020-04-28
DOI：10.3969/j.issn.1003-3246.2021.03.006
基金项目：中国地震局重大政策理论与实践问题研究课题（项目编号：CEAZY2021ZL01）
作者简介：周文杰(1995-),男,助理工程师,主要从事地震监测相关研究工作。E-mail:zwj2018@foxmail.com
*通讯作者：武巴特尔(1978-),男,蒙古族,副教授,主要从事地震学、地磁学等的研究。E-mail:wubte@163.com
参考文献：
陈颙, 黄庭方. 岩石物理学[M]. 北京:北京大学出版社, 2001.
啜永清, 张淑亮, 苏燕, 等. 大同地震序列的尾波Q值变化特征研究[J]. 地震, 2004, 24(2):66-72.
李白基, 秦嘉政, 钱晓东, 等. 云南姚安地区的尾波衰减[J]. 地震学报, 2004, 26(1):47-52.
李成, 王良书, 杨春. 下扬子区岩石圈双层脆韧性过渡带叠置的流变学证据[J]. 地质论评, 2001, 47(3):245-249.
李锋, 李迎春, 李强, 等. 2016年10月20日射阳MS 4.4地震的震源机制与地震序列的时空分布特征[J]. 地震学报, 2017, 39(5):659-668.
李迎春, 李锋, 王俊菲, 等. 2016年10月20日江苏射阳4.4级地震前的地震活动异常特征[J]. 国际地震动态, 2018, (4):67-73.
吕坚, 朱新运, 高建华, 等. 利用Sato模型研究九江-瑞昌地震序列的Qc值特征[J]. 大地测量与地球动力学, 2007, 27(2):32-36.
钱晓东, 李白基, 秦嘉政. 2001年云南施甸MS 5.9地震余震序列尾波Qc值研究[J]. 地震地磁观测与研究, 2004, 25(1):9-17.
史水平, 周斌, 黄树生, 等. 2013年广西平果震群尾波衰减特征研究[J]. 中国地震, 2015, 31(4):710-720.
舒良树, 王博, 王良书, 等. 苏北盆地晚白垩世-新近纪原型盆地分析[J]. 高校地质学报, 2005, 11(4):534-543.
王勤彩, 郑斯华, 刁桂苓, 等. 张北地震序列的尾波Qc值研究[J]. 防灾减灾工程学报, 2004, 24(1):37-40.
吴晓峰, 宋浩, 代宪鹏, 等. 2016年射阳MS 4.4地震前后重力场变化[J]. 地震地磁观测与研究, 2019, 40(1):96-101.
杨云, 霍祝青. 苏中沿海地区尾波Qc值特征研究[J]. 西北地震学报, 2011, 33(2):166-170.
张小涛, 韩利萍, 吕凤章, 等. 利用Sato模型研究邢台震区尾波Qc值特征[J]. 西北地震学报, 2007, 29(3):218-223.
缪阿丽, 周志华, 叶碧文, 等. 2016年10月20日射阳MS 4.4地震前地下流体典型异常特征及其前兆机理分析[J]. 地震工程学报, 2017, 39(Z1):72-78.
Aki K. Analysis of the seismic coda of local earthquakes as scattered waves[J]. Journal of Geophysical Research, 1969, 74(2):615-631.
Aki K, Chouet B. Origin of coda waves:source, attenuation, and scattering effects[J]. Journal of Geophysical Research, 1975, 80(23):3 322-3 342.
Aki K. Scale dependence in earthquake phenomena and its relevance to earthquake prediction[J]. Proceedings of the National Academy of Sciences of the United States of America, 1996, 93(9):3 740-3 747.
Aki K. A new view of earthquake and volcano precursors[J]. Earth, Planets and Space, 2004, 56(8):689-713.
Chung J K, Chen Y L, Shin T C. Spatial distribution of coda Q estimated from local earthquakes in Taiwan area[J]. Earth, Planets and Space, 2009, 61(9):1 077-1 088.
Gholamzadeh A, Rahimi H, Yaminifard F. Spatial and temporal variation of coda-wave attenuation in the Faryab region, southeast of the Sanandaj-Sirjan zone, using aftershocks of the Tiab earthquake of 28 February 2006[J]. Bulletin of the Seismological Society of America, 2014, 104(1):529-539.
Jin A S, Aki K. Spatial and temporal correlation between coda Q-1 and seismicity and its physical mechanism[J]. Journal of Geophysical Research:Solid Earth, 1989, 94(B10):14 041-14 059.
Jin A S, Aki K. Temporal correlation between coda Q-1 and seismicity-evidence for a structural unit in the brittle-ductile transition zone[J]. Journal of Geodynamics, 1993, 17(3):95-119.
Pulli J J. Attenuation of coda waves in New England[J]. Bull Seismol Soc Am, 1984, 74(4):1 149-1 166.
Sato H. Energy propagation including scattering effects sengle isotropic scattering approximation[J]. Journal of Physics of the Earth, 1977, 25(1):27-41.
Sato H, Matsumura S. Q-1 value for S-waves (2~32Hz) under the Kanto district in Japan[J]. Earthquake, 1980, 33(4):541-543.
Singh S, Herrmann R B. Regionalization of crustal coda Q in the continental United States[J]. Journal of Geophysical Research:Solid Earth, 1983, 88(B1):527-538.
