气枪震源地震波走时变化影响因素分析及地震相关的走时变化

摘要/Abstract

摘要： 云南省地震局在程海断裂以西10 km的大银甸水库处建成了气枪震源发射台, 在水库丰水期内进行连续激发观测。 2014年8月21日、 24日气枪震源附近分别发生M_S4.2、 M_L4.1和M_L4.0地震。本文利用宾川气枪震源附近的钟英台、黄坪台等10个台站2014年9月8日至2015年2月28日观测数据, 使用波形互相关方法提取这些台站气枪信号的走时变化, 使用射线追踪的方式正演研究了气压、水库水位、潮汐应力等因素对波速变化的影响。排除上述影响后, 认为3次4级左右地震可能是2014年9月台站气枪信号走时增大0.04~0.05 s的原因。

关键词: 主动震源走时变化同震效应互相关时延检测

Abstract: The Binchuan Earthquake Transmitting Seismic Station is located in Dayindian reservoir, which 10 kilometers west of the Chenghai Fault. There are 3 earthquakes with magnitude of M_S4.2, M_L4.1 and M_L4.0 occurred around BETSS on 21st and 24th, August, 2014. Data collected from 10 mobile seismic stations from 8th, August, 2014 to 28th, February, 2015, are used to get travel time changes using waveform cross-correlation method. We calculated and analyzed influences of atmospheric pressure, water level of Dayindian reservoir and tidal stress on travel time changes using ray tracing method. After eliminating the effects of above factors, we deem that the possible reason of the increase of travel time in August 2018 is the the 3 earthquakes mentioned above.

Key words: Airgun source, Travel time change, Co-seismic effect

中图分类号:

P315.7

周青云, 刘自凤, 贺素歌. 气枪震源地震波走时变化影响因素分析及地震相关的走时变化[J]. 地震, 2018, 38(3): 144-157.

ZHOU Qing-yun, LIU Zi-feng, He Su-ge. Influence Factors of Velocity Variation of Airgun Seismic Waves and Travel Time Changes Related to Earthquakes[J]. EARTHQUAKE, 2018, 38(3): 144-157.

参考文献

[1] Birch F. The velocity of compressional waves in rocks to 10 kilobars part 1[J]. J Geophys Res, 1960, 65(4): 1083-1102.
[2] Nur A, Simmons G. The effect of saturation on velocity in low porosity rocks[J]. Earth & Planetary Science Letters, 1969, 7(2): 183-193.
[3] Aki K. Asperities barriers characteristic earthquakes and strong motion prediction[J]. J Geophys Res, 1984, 89(NB7): 5867-5872.
[4] Rice J R. Chapter 20 Fault Stress States, Pore Pressure Distributions, and the Weakness of the San Andreas Fault, International Geophysics[J]. 1992, 51: 475-503.
[5] Scholz C H. Microfracturing and the inelastic deformation of rock in compression[J]. J Geophys Res, 1968, 73(73) : 1417-1432.
[6] Scholz C H. The mechanics of earthquakes and faulting[M]. New York: Cambridge University Press, 2002.
[7] Niu F, Silver P G, Daley T M, et al. Preseismic velocity changes observed from active source monitoring at the Parkfield SAFOD drill site[J]. Nature, 2008, 454: 204-208.
[8] Wang B, Zhu P, Chen Y, et al. Continuous subsurface velocity measurement with coda wave interferometry[J]. J Geophys Res, 2008, 113: B12313.
[9] 杨微, 葛洪魁, 王宝善, 等. 由精密控制人工震源观测到的绵竹5.6级地震前后波速变化[J]. 地球物理学报, 2010, 53(5): 1149-1157.
[10] 王彬, 吴国华, 苏有锦, 等. 宾川地震信号发射台的选址、建设及初步观测结果[J]. 地震研究, 2015, 38(1): 1-6.
[11] 王彬, 杨润海, 王宝善, 等. 地震波走时变化精确测量的实验研究[J]. 云南大学学报(自然科学版), 2012, 34(S2): 15-20.
[12] 王彬, 李孝宾, 刘自凤, 等. 宾川地震信号发射台的震源系统、观测系统和观测结果[J]. 中国地震, 2016, 32(2): 193-201.
[13] Carter G C. Coherence and time delay estimation, Proceedings of the IEEE[J]. 1987, 75(2): 236-255.
[14] Walker T F, Trahey G E. A fundamental limit on delay estimation using partially correlated speckle signals[J]. IEEE Transactions on Ultrasonics Ferroelectrics & Frequency Control, 1995, 42(2): 301-308.
[15] Silver P G, Daley T M, Niu F, et al. Active source monitoring of cross-well seismic travel time for stress-induced changes[J]. Bulletin of the Seismological Society of America, 2006, 97(1b): 281-293.
[16] 凌栋宝, 党建国, 白生菊. 土壤中的温度分布[J]. 青海科技, 1997, 4(3): 32-35.
[17] 刘光鼎. 陆相油储地球物理学导论[M]. 北京: 科学出版社, 1998.
[18] 周仕勇. 现代地震学教程[M]. 北京: 北京大学出版社, 2010.
[19] 陈思文. 滇西地区云县-宁蒗剖面二维速度结构与构造特征研究[D]. 北京: 中国地震局地球物理研究所, 2015.
[20] 王伟涛, 王宝善, 葛洪奎, 等. 利用主动震源检测汶川地震余震引起的浅层波速变化[J]. 中国地震, 2009, 25(3): 223-233.
[21] 陈蒙. 利用水库大容量非调制气枪阵列进行区域尺度地下结构探测和监测[D]. 北京: 中国地震局地球物理研究所, 2014.
[22] 吴庆鹏. 重力学与固体潮[M]. 北京: 地震出版社, 1988.
[23] Sun W. Seismic energy distribution in latitude and a possible tidal stress explanation[J]. Physics of the Earth & Planetary Interiors, 1992, 71(3): 205-216.
[24] Liu L, Zoback M D. The effect of topography on the state of stress in the crust-Application to the site of the Cajon Pass Scientific Drilling Project[J]. Applied Catalysis A, 1992, 97(B4): 5095-5108.
[25] 雷兴林, 马胜利, 闻学泽, 等. 地表水体对断层应力与地震时空分布影响的综合分析: 以紫坪铺水库为例[J]. 地震地质, 2008, 30(4): 1046-1064.
[26] Jaeger J C, Cook N. Fundamentals of rock mechanics, Science Paperbacks[J]. 1979, 9(3): 251-252.
[27] Abercrombie R E. Earthquake source scaling relationships from -1 to 5 M_L using seismograms recorded at 2.5 km depth[J]. J Geophys Res, 1995, 1002(B12): 24015-24036.
[28] Aki K, Richards P G. Quantitative Seismology(second edition)[M]. California: University Science Books, 2002.
[29] 杨晶琼, 刘丽芳, 杨周胜. 云南中小地震矩震级的测定[J]. 地震研究, 2013, 36(3): 306-312.
[30] 刘自凤, 苏有锦, 王宝善, 等. 宾川主动源地震波走时变化分析方法研究[J]. 地震研究, 2015, 38(4): 591-597.