Study of the Change in Wave Velocity Ratio before and after Two Strong Earthquakes Using Airgun Source Data
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摘要
Using the signals excited by the large-volume airgun source at the Binchuan transmitting seismic station from January to June, 2016, arrival-time data was acquired at four stations near the epicenter of the Eryuan M_S4.5 and M_S4.0 earthquakes on February 8, 2016, as well as the epicenter of the Yunlong M_S5.0 and Eryuan M_S4.6 earthquakes on May 18, 2016 through the waveform cross-correlation technique. The wave velocity ratio of the four stations was calculated using the single-station method. At the same time, the b-value and the focal mechanism consistency parameters of the study area were also calculated. The results show that:(1) the wave velocity ratio of each station experienced a process of decline-recovery-fast rise before the two strong earthquakes, and a significant quasi-synchronous rapid rise occurred within 3-12 days before the earthquake;(2) the timing of the rapid rise of the wave velocity ratio of the four stations before the Yunlong M_S5.0 and Eryuan M_S4.6 earthquakes were related to the epicentral distance. The station which observed the earliest increase in rapid rise is the farthest one from the epicenter, and the station where the rapid rise appeared in the latest is closest to the epicenter;(3) the form of change of the wave velocity ratio before the earthquake was different between stations located at different directions in the epicenter area;(4) the b-value and the focal mechanism consistency parameter which is commonly used to characterize the stress level both showed a downward trend before the two strong earthquakes, and were consistent with the change in the wave velocity ratio. According to the preliminary analysis, the wave velocity ratio obtained by using airgun source can better reflect the change in the stress state of the underground medium.
Using the signals excited by the large-volume airgun source at the Binchuan transmitting seismic station from January to June, 2016, arrival-time data was acquired at four stations near the epicenter of the Eryuan M_S4.5 and M_S4.0 earthquakes on February 8, 2016, as well as the epicenter of the Yunlong M_S5.0 and Eryuan M_S4.6 earthquakes on May 18, 2016 through the waveform cross-correlation technique. The wave velocity ratio of the four stations was calculated using the single-station method. At the same time, the b-value and the focal mechanism consistency parameters of the study area were also calculated. The results show that:(1) the wave velocity ratio of each station experienced a process of decline-recovery-fast rise before the two strong earthquakes, and a significant quasi-synchronous rapid rise occurred within 3-12 days before the earthquake;(2) the timing of the rapid rise of the wave velocity ratio of the four stations before the Yunlong M_S5.0 and Eryuan M_S4.6 earthquakes were related to the epicentral distance. The station which observed the earliest increase in rapid rise is the farthest one from the epicenter, and the station where the rapid rise appeared in the latest is closest to the epicenter;(3) the form of change of the wave velocity ratio before the earthquake was different between stations located at different directions in the epicenter area;(4) the b-value and the focal mechanism consistency parameter which is commonly used to characterize the stress level both showed a downward trend before the two strong earthquakes, and were consistent with the change in the wave velocity ratio. According to the preliminary analysis, the wave velocity ratio obtained by using airgun source can better reflect the change in the stress state of the underground medium.
Using the signals excited by the large-volume airgun source at the Binchuan transmitting seismic station from January to June, 2016, arrival-time data was acquired at four stations near the epicenter of the Eryuan M_S4.5 and M_S4.0 earthquakes on February 8, 2016, as well as the epicenter of the Yunlong M_S5.0 and Eryuan M_S4.6 earthquakes on May 18, 2016 through the waveform cross-correlation technique. The wave velocity ratio of the four stations was calculated using the single-station method. At the same time, the b-value and the focal mechanism consistency parameters of the study area were also calculated. The results show that:(1) the wave velocity ratio of each station experienced a process of decline-recovery-fast rise before the two strong earthquakes, and a significant quasi-synchronous rapid rise occurred within 3-12 days before the earthquake;(2) the timing of the rapid rise of the wave velocity ratio of the four stations before the Yunlong M_S5.0 and Eryuan M_S4.6 earthquakes were related to the epicentral distance. The station which observed the earliest increase in rapid rise is the farthest one from the epicenter, and the station where the rapid rise appeared in the latest is closest to the epicenter;(3) the form of change of the wave velocity ratio before the earthquake was different between stations located at different directions in the epicenter area;(4) the b-value and the focal mechanism consistency parameter which is commonly used to characterize the stress level both showed a downward trend before the two strong earthquakes, and were consistent with the change in the wave velocity ratio. According to the preliminary analysis, the wave velocity ratio obtained by using airgun source can better reflect the change in the stress state of the underground medium.
引文
Aki K.Maximum likelihood estimate of b in the formula log N=a-b M and its confidence limits[J].Bulletin of the Earthquake Research Institute,University of Tokyo,1965,43(2):237-239.
Cai Tianjing,Tang Han.Review on the least-squares-fit principle of Savitzky-Golay smoothing filter[J].Digital Communication,2011,38(1):63-68,82(in Chinese with English abstract).
Chen Jia,Li Xiaobin,Yang Jun,Ye Beng.Large volume air-gun source spectrum characteristics of Binchuan,Yunnan[J].Earthquake Research in China,2016,32(2):216-221(in Chinese with English abstract).
Chen Jia,Ye Beng,Gao Qiong,Wang Jun,Li Xiaobin,Yang Jun.Research on variation characteristics of wave velocity ratio before and after the 2016 Yunlong MS5.0 earthquake using airgun signals[J].Journal of Seismological Research,2017,40(4):550-556,677(in Chinese with English abstract).
Chen Yang,Lv Yuejun,Xie Zhuojuan,Pan Long.Review of the study of seismicity parameter b-value[J].Bulletin of the Institute of Crustal Dynamics,2013:38-47(in Chinese with English abstract).
Chen Yong.Consistency of focal mechanism as a new parameter in describing seismic activity[J].Chinese Journal of Geophysics,1978,21(2):142-159(in Chinese with English abstract).
Chen Yong,Wang Baoshan,Yao Huajian.Seismic airgun exploration of continental crust structures[J].Science China Earth Science,2017,60(10):1739-1751.
Feng Deyi,Tan Aina,Wang Kefen.Velocity anomalies of seismic waves from near earthquakes and earthquake prediction[J].Acta Geophysica Sinica,1974,17(2):84-98(in Chinese with English abstract).
Feng Deyi,Gu Jinping,Wang Zhouyuan,Sheng Guoying,Luo Ruiming,Li Kelong.Preliminary study of the velocity anomalies of seismic waves before and after some strong and moderate earthquakes in western China(III):Variations of curvature of the Wadati diagrams[J].Acta Geophysica Sinica,1978,21(4):292-309(in Chinese with English abstract).
Feng Deyi.Velocity Anomaly of Seismic Waves[M].Beijing:Seismological Press,1981.2-15,140-149,236-246(in Chinese).
Gephart J.W.,Forsyth D.W.An improved method for determining the regional stress tensor using earthquake focal mechanism data:Application to the San Fernando earthquake sequence[J].Journal of Geophysical Research:Solid Earth,1984,89(B11):9305-9320.
Hardebeck J.L.,Michael A.J.Damped regional-scale stress inversions:Methodology and examples for southern California and the Coalinga aftershock sequence[J].Journal of Geophysical Research:Solid Earth,2006,111(B11):B11310.
Li Jin,Zhou Longquan,Long Haiying,Nie Xiaohong,Guo Yin.Spatial-temporal characteristics of the focal mechanism consistency parameter in Tianshan(within Chinese territory)seismic zone[J].Seismology and Geology,2015,37(3):792-803(in Chinese with English abstract).
Li Mingxiao,Liu Jie.Study on velocity ratio(vP/vS)anomaly of earthquake sequences in Yunnan region[J].Earthquake,2006,26(1):26-34(in Chinese with English abstract).
Li Yan’e,Wang Linying,Zheng Xuyao.Restudy of the variation of vP/vSbefore and after the Wenchuan earthquake[J].Acta Seismologica Sinica,2014,36(3):425-432(in Chinese with English abstract).
Li Yongli,Cai Jingguan,Cao Ke.Modulating ratio and b value in strong seismicity course in Yunnan region[J].Journal of Seismological Research,2002,25(1):25-30(in Chinese with English abstract).
Li Yongli,Zhao Xiaoyan,Fu Hong.Research on variation of wave velocity ratio before and after Water Storage for Xiaowan Reservoir[J].Journal of Seismological Research,2012,35(4):464-470(in Chinese with English abstract).
Liu Xuzhou.Study on Seismic Travel-Time Variation of Qilianshan Region Using Active Source Data[D].Lanzhou Institute of Seismology,China Earthquake Administration,2018(in Chinese with English abstract).
Liu Zifeng,Zhang Tianji,Fu Hong,Li Zhirong,Wang Guangming,Zhao Xiaoyan,Yu Dayuan.Characteristics of wave velocity ratio change before Yunnan Tonghai MS5.0 earthquake in 2018[J].Journal of Seismological Research,2018,41(4):494-502(in Chinese with English abstract).
Lu Zhong,Wyss M.,Pulpan H.Details of stress directions in the Alaska subduction zone from fault plane solutions[J].Journal of Geophysical Research:Solid Earth,1997,12(B3):5383-5402.
Mao Yan,Liu Zifeng,Ye Jianqing,Li Zhonghua.Analysis on strong earthquake risk of Xiaojiang fault zone[J].Journal of Seismological Research,2016,39(2):213-217(in Chinese with English abstract).
Michael A.J.Determination of stress from slip data:Faults and folds[J].Journal of Geophysical Research:Solid Earth,1984,89(B13):11517-11526.
Michael A.J.Use of focal mechanisms to determine stress:A control study[J].Journal of Geophysical Research:Solid Earth,1987,92(B1):357-368.
Michael A.J.,Ellsworth W.L.,Oppenheimer D.H.Coseismic stress changes induced by the 1989 Loma Prieta,California earthquake[J].Geophysical Research Letters,1990,17(9):1441-1444.
Michael A.J.Spatial variations in stress within the 1987 Whittier Narrows,California,aftershock sequence:New techniques and results[J].Journal of Geophysical Research:Solid Earth,1991,96(B4):6303-6319.
Scholz C.H.The frequency-magnitude relation of microfracturing in rock and its relation to earthquakes[J].Bulletin of the Seismological Society of America,1968,58(1):399-415.
Silver P.G.,Daley T.M.,Niu F.L.,Majer E.L.Active source monitoring of cross-well seismic travel time for stress-induced changes[J].Bulletin of the Seismological Society of America,2007,97(1B):281-293.
Wang Baoshan,Zhu Ping,Chen Yong,Niu,Fenglin,Wang Bin.Continuous Subsurface velocity measurement with coda wave interferometry[J].Journal of Geophysical Research:Solid Earth,2008,113(B12):B12313.
Wang Hui,Cao Jianling,Jing Yan,Li Zhen.Spatiotemporal pattern of b-value before major earthquakes in the Sichuan-Yunnan region[J].Seismology and Geology,2012,34(3):531-543(in Chinese with English abstract).
Wang Linying,Guo Yongxia,Liu Fang,Jiang Changsheng.Temporal vP/vSvariation characteristics in different zones of China’s Capital Circle area before and after Wen’an earthquake[J].Acta Seismologica Sinica,2008,21(3):243-257(in Chinese with English abstract).
Wang Linying,Li Yan’e,Zheng Xuyao,Wang Shengwen.Temporal variation of vP/vSat single seismic station before the 2013 Lushan MS7.0 earthquake[J].Acta Seismologica Sinica,2014,36(1):42-58(in Chinese with English abstract).
Wang Weitao,Wang Baoshan,Ge Hongkui,Chen Yong,Yuan Songyong,Yang Wei,Li Yijin.Using active source to monitor velocity variation in shallow sediment caused by the Wenchuan earthquake[J].Earthquake Research in China,2009,25(3):223-233(in Chinese with English abstract).
Wei Yunyun,Wang Haitao,Su Jinbo,Chen Xiangjun,Wang Qiong.The preliminary study on travel time abnormal variation of reflection wave phase of air-gun in Xinjiang before two earthquakes with MS5.0[J].Earthquake Research in China,2016,32(2):270-281(in Chinese with English abstract).
Weng Zhaoqiang,Liang Xiangjun,Wu Haoyu,Liu Linfei,Li Li.The variation of vP/vSat single seismic station of Shanxi region studied by Wadati method of single station and multi-earthquake[J].Earthquake Research in China,2015,31(1):89-100(in Chinese with English abstract).
Wiemer S.A software package to analyze seismicity:ZMAP[J].Seismological Research Letters,2001,72(2):373-382.
Wiemer S.,Gerstenberger M.,Hauksson E.Properties of the aftershock sequence of the 1999 MW7.1 Hector Mine earthquake:Implications for aftershock hazard[J].Bulletin of the Seismological Society of America,2002,92(4):1227-1240.
Wyss M.,Schorlemmer D.,Wiemer S.Mapping asperities by minima of local recurrence time:San JacintoElsinore fault zones[J].Journal of Geophysical Research:Solid Earth,2000,105(B4):7829-7844.
Xu Hui,Liu Xuejun,Wang Bin,Wang Baoshan.Monitoring temporal variation of subsurface seismic velocity in Xiaojiang fault zone using direct wave cross correlation time delay technique with active source[J].Journal of Seismological Research,2015,38(1):7-15(in Chinese with English abstract).
Xu Zhonghuai,Wang Suyun,Huang Yurui,Gao Ajia,Jin Xiaofeng,Chang Xiangdong.Directions of mean stress axes in southwestern China deduced from microearthquake data[J].Acta Geophysica Sinica,1987,30(5):476-486(in Chinese with English abstract).
Yi Guixi,Wen Xueze,Su Youjin.Study on the potential strong-earthquake risk for the eastern boundary of the Sichuan-Yunnan active faulted-block,China[J].Chinese Journal of Geophysics,2008,51(6):1719-1725(in Chinese with English abstract).
Yi Guixi,Wen Xueze,Zhang Zhiwei,Long Feng,Ruan Xiang,Du Fang.Study on potential strong earthquake risk in Mabian area,southern Sichuan[J].Seismology and Geology,2010,32(2):282-293(in Chinese with English abstract).
Yi Guixi,Wen Xueze,Xin Hua,Qiao Huizhen,Wang Siwei,Gong Yue.Stress state and major-earthquake risk on the southern segment of the Longmen Shan fault zone[J].Chinese Journal of Geophysics,2013,56(4):1112-1120(in Chinese with English abstract).
Zhang Yuansheng,Wang Baoshan,Chen Yong,Wang Lanmin,Zou Rui,Qin Manzhong,Guo Xiao,Shen Xuzhang,Wei Congxin,Liu Xuzhou,Wang Yahong,Sun Dianfeng,Guo Yingxia,Yin Liang.Travel-time variations before and after two major earthquakes derived from active-source seismic data[J].Chinese Journal of Geophysics,2017,60(10):3815-3822(in Chinese with English abstract).
Zhang Zhiwei,Zhou Longquan,Long Feng,Ruan Xiang.Spatial and temporal characteristic of stress field for Wenchuan MS8.0 and Lushan MS7.0 earthquake sequence[J].Seismology and Geology,2015,37(3):804-817(in Chinese with English abstract).
Zhong Jimao,Cheng Wanzheng.Determination of directions of the mean stress field in Sichuan-Yunnan region from a number of focal mechanism solutions[J].Acta Seismologica Sinica,2006,28(4):337-346(in Chinese with English abstract).
Zhou Qingyun,Liu Zifeng,He Suge.Influence factors of velocity variation of airgun seismic waves and travel time changes related to earthquakes[J].Earthquake,2018,38(3):144-157(in Chinese with English abstract).
Zou Zhenxuan,Li Jinlong,Yu Tiehong.Determining average seismic wave velocity ratios(vP/vS)in Shanxi reservoir of Wenzhou region by using multi-station method[J].Earthquake,2006,26(4):133-137(in Chinese with English abstract).
Cai Tianjing,Tang Han.Review on the least-squares-fit principle of Savitzky-Golay smoothing filter[J].Digital Communication,2011,38(1):63-68,82(in Chinese with English abstract).
Chen Jia,Li Xiaobin,Yang Jun,Ye Beng.Large volume air-gun source spectrum characteristics of Binchuan,Yunnan[J].Earthquake Research in China,2016,32(2):216-221(in Chinese with English abstract).
Chen Jia,Ye Beng,Gao Qiong,Wang Jun,Li Xiaobin,Yang Jun.Research on variation characteristics of wave velocity ratio before and after the 2016 Yunlong MS5.0 earthquake using airgun signals[J].Journal of Seismological Research,2017,40(4):550-556,677(in Chinese with English abstract).
Chen Yang,Lv Yuejun,Xie Zhuojuan,Pan Long.Review of the study of seismicity parameter b-value[J].Bulletin of the Institute of Crustal Dynamics,2013:38-47(in Chinese with English abstract).
Chen Yong.Consistency of focal mechanism as a new parameter in describing seismic activity[J].Chinese Journal of Geophysics,1978,21(2):142-159(in Chinese with English abstract).
Chen Yong,Wang Baoshan,Yao Huajian.Seismic airgun exploration of continental crust structures[J].Science China Earth Science,2017,60(10):1739-1751.
Feng Deyi,Tan Aina,Wang Kefen.Velocity anomalies of seismic waves from near earthquakes and earthquake prediction[J].Acta Geophysica Sinica,1974,17(2):84-98(in Chinese with English abstract).
Feng Deyi,Gu Jinping,Wang Zhouyuan,Sheng Guoying,Luo Ruiming,Li Kelong.Preliminary study of the velocity anomalies of seismic waves before and after some strong and moderate earthquakes in western China(III):Variations of curvature of the Wadati diagrams[J].Acta Geophysica Sinica,1978,21(4):292-309(in Chinese with English abstract).
Feng Deyi.Velocity Anomaly of Seismic Waves[M].Beijing:Seismological Press,1981.2-15,140-149,236-246(in Chinese).
Gephart J.W.,Forsyth D.W.An improved method for determining the regional stress tensor using earthquake focal mechanism data:Application to the San Fernando earthquake sequence[J].Journal of Geophysical Research:Solid Earth,1984,89(B11):9305-9320.
Hardebeck J.L.,Michael A.J.Damped regional-scale stress inversions:Methodology and examples for southern California and the Coalinga aftershock sequence[J].Journal of Geophysical Research:Solid Earth,2006,111(B11):B11310.
Li Jin,Zhou Longquan,Long Haiying,Nie Xiaohong,Guo Yin.Spatial-temporal characteristics of the focal mechanism consistency parameter in Tianshan(within Chinese territory)seismic zone[J].Seismology and Geology,2015,37(3):792-803(in Chinese with English abstract).
Li Mingxiao,Liu Jie.Study on velocity ratio(vP/vS)anomaly of earthquake sequences in Yunnan region[J].Earthquake,2006,26(1):26-34(in Chinese with English abstract).
Li Yan’e,Wang Linying,Zheng Xuyao.Restudy of the variation of vP/vSbefore and after the Wenchuan earthquake[J].Acta Seismologica Sinica,2014,36(3):425-432(in Chinese with English abstract).
Li Yongli,Cai Jingguan,Cao Ke.Modulating ratio and b value in strong seismicity course in Yunnan region[J].Journal of Seismological Research,2002,25(1):25-30(in Chinese with English abstract).
Li Yongli,Zhao Xiaoyan,Fu Hong.Research on variation of wave velocity ratio before and after Water Storage for Xiaowan Reservoir[J].Journal of Seismological Research,2012,35(4):464-470(in Chinese with English abstract).
Liu Xuzhou.Study on Seismic Travel-Time Variation of Qilianshan Region Using Active Source Data[D].Lanzhou Institute of Seismology,China Earthquake Administration,2018(in Chinese with English abstract).
Liu Zifeng,Zhang Tianji,Fu Hong,Li Zhirong,Wang Guangming,Zhao Xiaoyan,Yu Dayuan.Characteristics of wave velocity ratio change before Yunnan Tonghai MS5.0 earthquake in 2018[J].Journal of Seismological Research,2018,41(4):494-502(in Chinese with English abstract).
Lu Zhong,Wyss M.,Pulpan H.Details of stress directions in the Alaska subduction zone from fault plane solutions[J].Journal of Geophysical Research:Solid Earth,1997,12(B3):5383-5402.
Mao Yan,Liu Zifeng,Ye Jianqing,Li Zhonghua.Analysis on strong earthquake risk of Xiaojiang fault zone[J].Journal of Seismological Research,2016,39(2):213-217(in Chinese with English abstract).
Michael A.J.Determination of stress from slip data:Faults and folds[J].Journal of Geophysical Research:Solid Earth,1984,89(B13):11517-11526.
Michael A.J.Use of focal mechanisms to determine stress:A control study[J].Journal of Geophysical Research:Solid Earth,1987,92(B1):357-368.
Michael A.J.,Ellsworth W.L.,Oppenheimer D.H.Coseismic stress changes induced by the 1989 Loma Prieta,California earthquake[J].Geophysical Research Letters,1990,17(9):1441-1444.
Michael A.J.Spatial variations in stress within the 1987 Whittier Narrows,California,aftershock sequence:New techniques and results[J].Journal of Geophysical Research:Solid Earth,1991,96(B4):6303-6319.
Scholz C.H.The frequency-magnitude relation of microfracturing in rock and its relation to earthquakes[J].Bulletin of the Seismological Society of America,1968,58(1):399-415.
Silver P.G.,Daley T.M.,Niu F.L.,Majer E.L.Active source monitoring of cross-well seismic travel time for stress-induced changes[J].Bulletin of the Seismological Society of America,2007,97(1B):281-293.
Wang Baoshan,Zhu Ping,Chen Yong,Niu,Fenglin,Wang Bin.Continuous Subsurface velocity measurement with coda wave interferometry[J].Journal of Geophysical Research:Solid Earth,2008,113(B12):B12313.
Wang Hui,Cao Jianling,Jing Yan,Li Zhen.Spatiotemporal pattern of b-value before major earthquakes in the Sichuan-Yunnan region[J].Seismology and Geology,2012,34(3):531-543(in Chinese with English abstract).
Wang Linying,Guo Yongxia,Liu Fang,Jiang Changsheng.Temporal vP/vSvariation characteristics in different zones of China’s Capital Circle area before and after Wen’an earthquake[J].Acta Seismologica Sinica,2008,21(3):243-257(in Chinese with English abstract).
Wang Linying,Li Yan’e,Zheng Xuyao,Wang Shengwen.Temporal variation of vP/vSat single seismic station before the 2013 Lushan MS7.0 earthquake[J].Acta Seismologica Sinica,2014,36(1):42-58(in Chinese with English abstract).
Wang Weitao,Wang Baoshan,Ge Hongkui,Chen Yong,Yuan Songyong,Yang Wei,Li Yijin.Using active source to monitor velocity variation in shallow sediment caused by the Wenchuan earthquake[J].Earthquake Research in China,2009,25(3):223-233(in Chinese with English abstract).
Wei Yunyun,Wang Haitao,Su Jinbo,Chen Xiangjun,Wang Qiong.The preliminary study on travel time abnormal variation of reflection wave phase of air-gun in Xinjiang before two earthquakes with MS5.0[J].Earthquake Research in China,2016,32(2):270-281(in Chinese with English abstract).
Weng Zhaoqiang,Liang Xiangjun,Wu Haoyu,Liu Linfei,Li Li.The variation of vP/vSat single seismic station of Shanxi region studied by Wadati method of single station and multi-earthquake[J].Earthquake Research in China,2015,31(1):89-100(in Chinese with English abstract).
Wiemer S.A software package to analyze seismicity:ZMAP[J].Seismological Research Letters,2001,72(2):373-382.
Wiemer S.,Gerstenberger M.,Hauksson E.Properties of the aftershock sequence of the 1999 MW7.1 Hector Mine earthquake:Implications for aftershock hazard[J].Bulletin of the Seismological Society of America,2002,92(4):1227-1240.
Wyss M.,Schorlemmer D.,Wiemer S.Mapping asperities by minima of local recurrence time:San JacintoElsinore fault zones[J].Journal of Geophysical Research:Solid Earth,2000,105(B4):7829-7844.
Xu Hui,Liu Xuejun,Wang Bin,Wang Baoshan.Monitoring temporal variation of subsurface seismic velocity in Xiaojiang fault zone using direct wave cross correlation time delay technique with active source[J].Journal of Seismological Research,2015,38(1):7-15(in Chinese with English abstract).
Xu Zhonghuai,Wang Suyun,Huang Yurui,Gao Ajia,Jin Xiaofeng,Chang Xiangdong.Directions of mean stress axes in southwestern China deduced from microearthquake data[J].Acta Geophysica Sinica,1987,30(5):476-486(in Chinese with English abstract).
Yi Guixi,Wen Xueze,Su Youjin.Study on the potential strong-earthquake risk for the eastern boundary of the Sichuan-Yunnan active faulted-block,China[J].Chinese Journal of Geophysics,2008,51(6):1719-1725(in Chinese with English abstract).
Yi Guixi,Wen Xueze,Zhang Zhiwei,Long Feng,Ruan Xiang,Du Fang.Study on potential strong earthquake risk in Mabian area,southern Sichuan[J].Seismology and Geology,2010,32(2):282-293(in Chinese with English abstract).
Yi Guixi,Wen Xueze,Xin Hua,Qiao Huizhen,Wang Siwei,Gong Yue.Stress state and major-earthquake risk on the southern segment of the Longmen Shan fault zone[J].Chinese Journal of Geophysics,2013,56(4):1112-1120(in Chinese with English abstract).
Zhang Yuansheng,Wang Baoshan,Chen Yong,Wang Lanmin,Zou Rui,Qin Manzhong,Guo Xiao,Shen Xuzhang,Wei Congxin,Liu Xuzhou,Wang Yahong,Sun Dianfeng,Guo Yingxia,Yin Liang.Travel-time variations before and after two major earthquakes derived from active-source seismic data[J].Chinese Journal of Geophysics,2017,60(10):3815-3822(in Chinese with English abstract).
Zhang Zhiwei,Zhou Longquan,Long Feng,Ruan Xiang.Spatial and temporal characteristic of stress field for Wenchuan MS8.0 and Lushan MS7.0 earthquake sequence[J].Seismology and Geology,2015,37(3):804-817(in Chinese with English abstract).
Zhong Jimao,Cheng Wanzheng.Determination of directions of the mean stress field in Sichuan-Yunnan region from a number of focal mechanism solutions[J].Acta Seismologica Sinica,2006,28(4):337-346(in Chinese with English abstract).
Zhou Qingyun,Liu Zifeng,He Suge.Influence factors of velocity variation of airgun seismic waves and travel time changes related to earthquakes[J].Earthquake,2018,38(3):144-157(in Chinese with English abstract).
Zou Zhenxuan,Li Jinlong,Yu Tiehong.Determining average seismic wave velocity ratios(vP/vS)in Shanxi reservoir of Wenzhou region by using multi-station method[J].Earthquake,2006,26(4):133-137(in Chinese with English abstract).
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