云南地区与频率有关的P波、S波衰减研究
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摘要
分析了1999年7月—2003年12月发生在云南地区的由22个地震台站记录的5 668 次地震的数字波形资料,从中选出保山、永胜、丽江、鹤庆、易门和禄劝6个地震台用扩展的 尾波归一化方法计算P波、S波衰减．这6个台分为3个研究区,保山研究区内Q-1s= O．008 67f-0.86,Q-1p=O．011 55f-0.93;永胜、丽江、鹤庆研究区内Q-1s=O．018 24f-0.94,Q-1p =O．022 88f-0.92;禄劝、易门研究区内Q-1s=O．016 47f-0.91,Q-1p=O．028 26f-0.97．后两个 研究区衰减结果比较接近,而保山研究区的P波、S波衰减明显偏低．与全球其它地区采用 同样方法得到的P波、S波衰减结果对比表明:永胜、丽江、鹤庆研究区和禄劝、易门研究区 的P波、S波衰减与日本关东地区很接近,而远高于韩国东南部的衰减;保山研究区的P波、 S波衰减略高于韩国东南部．此外,还与前人得到的云南地区的尾波衰减结果进行了对比分 析,发现本文S波衰减值与他们的结果相近．
We analyzed digital seismogram data of 5 668 earthquakes that occurred in Yunnan region during July of 1997 to December of 2003, then selected six seismic stations from the 22 ones and calculated their attenuations of P and S waves by using the extended coda-normalization method. We classified six stations into three regions according to their location, that is, Baoshan area, Yongsheng-Lijiang-Heqing (YLH) area and Luquan-Yi-men (LY) area. The values of Q-1s and Q-1p are expressed as Q-1s =0. 00867f-0.86, Q-1p = 0. 01155f-0.93, Q-1s=0. 01824f-0.94, Q-1p =0. 02288f-0.92 and Q-1s =0. 01647f-0.91 , Q-1p = 0. 02826f-0.97 in Baoshan, YLH, LY areas respectively. The attenuation of YHL and LY are closer to each other, however, Baoshan area is apparently lower. Comparing attenuations of the three areas with that in other areas of the world using the same method, it is suggested that the attenuation of P and S wave in YLH area and LY area is close to Kanto of Japan, but much higher than southeast of South Korea. The Q-1s and Q-1p in Baoshan area is slightly higher than southeast of South Korea. Furthermore, the results indicate that our Q-1s in Yunnan area was close to predecessors by analyzing the coda attenuation.
We analyzed digital seismogram data of 5 668 earthquakes that occurred in Yunnan region during July of 1997 to December of 2003, then selected six seismic stations from the 22 ones and calculated their attenuations of P and S waves by using the extended coda-normalization method. We classified six stations into three regions according to their location, that is, Baoshan area, Yongsheng-Lijiang-Heqing (YLH) area and Luquan-Yi-men (LY) area. The values of Q-1s and Q-1p are expressed as Q-1s =0. 00867f-0.86, Q-1p = 0. 01155f-0.93, Q-1s=0. 01824f-0.94, Q-1p =0. 02288f-0.92 and Q-1s =0. 01647f-0.91 , Q-1p = 0. 02826f-0.97 in Baoshan, YLH, LY areas respectively. The attenuation of YHL and LY are closer to each other, however, Baoshan area is apparently lower. Comparing attenuations of the three areas with that in other areas of the world using the same method, it is suggested that the attenuation of P and S wave in YLH area and LY area is close to Kanto of Japan, but much higher than southeast of South Korea. The Q-1s and Q-1p in Baoshan area is slightly higher than southeast of South Korea. Furthermore, the results indicate that our Q-1s in Yunnan area was close to predecessors by analyzing the coda attenuation.
引文
陈培善,刘福田,李强,等．1990．云南地区速度结构的横向不均匀性[J]．中国科学,B辑,20(4):431～438
黄玉龙,郑斯华,刘杰,等．2003．广东地区地震衰减和场地响应的研究[J]．地球物理学报,46(1):54-61
阚荣举,韩源．1992．云南遮放至马龙地学断面(说明书)．北京:地震出版社,28～37
李白基,秦嘉政,钱晓东,等．2004．云南姚安地区的尾波衰减[J]．地震学报,26(1):47-52
刘建华,刘福田,吴华,等．1989．中国南北带地壳和上地幔的三维速度图象[J]．地球物理学报,32(2):143～151
刘祖荫,皇甫岗,金志林,等．1999．一九七○年通海地震[M]．北京:地震出版社,115
秦嘉政,阚荣举．1986．龙陵地震前后区域Q值和平均剪应力的分布特征[J]．地震学报,8(1):57-72
秦嘉政,阚荣举．1992．滇西地区应力场和Q值的时空变化与地震前兆分析[J]．地震,(5):44-53
秦嘉政,刘祖荫．1995．滇西实验场两次中强地震前后尾波衰减的区域特征分析[J]．中国地震,11(3):212-221
王勤彩,高景春,郑斯华,等．2004．华北中北部地面运动衰减研究[J]．防灾减灾工程学报,(3):314-319
吴建平,明跃红,王椿镛,等．2001．云南数字地震台站下方的S波速度结构研究[J]．地球物理学报．44(2):228-237
张天中,高龙生,张卫平．1990．滇西实验场区的Q值及其随时间窗的变化[J]．地震学报,12(1):12～21
Aki K. 1980. Attenuation of shear waves in the lithosphere for frequencies from 0. 05 to 25 Hz[J]. Phys Earth Planet, 21: 50-60
Atkinson G M, Mereu R F. 1992. The shape of ground attenuation curves in Southeastern Canada[J], Bull Seism Soc Amer, 82: 2 014-2 031
Chung Tae-Woong, Sato H. 2001. Attenuation of high-frequency P and S waves in the crust of Southeastern Korea[J], Bull Seism Soc Amer, 91; 1 867-1 874
Kinoshita S. 1994. Frequency-dependent attenuation of shear waves in the crust of the Southern Kanto area, Japan[J]. Bull Seism Soc Amer, 84: 1 387-1 396
Ordaz M. 1992. Source spectra and spectral attenuation of seismic waves from Mexican earthquake and evidence of amplification in the hill zone of Mexicao city[J]. Bull Seism Soc Amer, 82: 24-43
Sato H. 1980. Q-1 value for S-wave under the Kanto district in Japan[J], Zisin, 33, 541-543
Sato H. 1989. Broadening of seismogram envelops in the randomly inhomogeneous lithosphere based on the parabolic ap-proximation: Southeastern Honshu, Japan[J]. J Geophys Res, 94: 17 735 - 17 747
Sato H. 1992. Thermal structure of the mantle wedge beneath Northeastern Japan:magmatism in an island arc from the combined data of seismic anelasticity and velocity and heat flow[J]. Volcanol Geothem Res, 51: 237 - 252
Shi Jinghua, Kin W Y, Richard P G. 1998. The corner frequency and stress drops of intraplate earthquake in the northeastern United States[J]. Bull Seism Soc Amer, 88: 531 - 542
Singh S K, Ordaz M, Dattatrayam R S. 1999. A spectral analysis of the 21 May 1997 Jabalpur India, earthquake and estimation of ground motion from future earthquakes in the India shield region[J]. Bull Seism Soc Amer, 89: 1 620 -1 830
Yoshimoto K, Sato H, Yoshihisa. et al. 1993. Frequency-dependent attenuation of P and S waves in the Kanto area, Japan, based on the coda-normalization method[J]. Geopkys J Int, 114: 165-174
Yoshimoto K, Sato H, Yoshihisa I, et al. 1998. Frequency-dependent attenuation of high-frequency P and S waves in the upper crust in western Nagano, Japan[J]. Pure Appl Geophys, 153. 489-502
黄玉龙,郑斯华,刘杰,等．2003．广东地区地震衰减和场地响应的研究[J]．地球物理学报,46(1):54-61
阚荣举,韩源．1992．云南遮放至马龙地学断面(说明书)．北京:地震出版社,28～37
李白基,秦嘉政,钱晓东,等．2004．云南姚安地区的尾波衰减[J]．地震学报,26(1):47-52
刘建华,刘福田,吴华,等．1989．中国南北带地壳和上地幔的三维速度图象[J]．地球物理学报,32(2):143～151
刘祖荫,皇甫岗,金志林,等．1999．一九七○年通海地震[M]．北京:地震出版社,115
秦嘉政,阚荣举．1986．龙陵地震前后区域Q值和平均剪应力的分布特征[J]．地震学报,8(1):57-72
秦嘉政,阚荣举．1992．滇西地区应力场和Q值的时空变化与地震前兆分析[J]．地震,(5):44-53
秦嘉政,刘祖荫．1995．滇西实验场两次中强地震前后尾波衰减的区域特征分析[J]．中国地震,11(3):212-221
王勤彩,高景春,郑斯华,等．2004．华北中北部地面运动衰减研究[J]．防灾减灾工程学报,(3):314-319
吴建平,明跃红,王椿镛,等．2001．云南数字地震台站下方的S波速度结构研究[J]．地球物理学报．44(2):228-237
张天中,高龙生,张卫平．1990．滇西实验场区的Q值及其随时间窗的变化[J]．地震学报,12(1):12～21
Aki K. 1980. Attenuation of shear waves in the lithosphere for frequencies from 0. 05 to 25 Hz[J]. Phys Earth Planet, 21: 50-60
Atkinson G M, Mereu R F. 1992. The shape of ground attenuation curves in Southeastern Canada[J], Bull Seism Soc Amer, 82: 2 014-2 031
Chung Tae-Woong, Sato H. 2001. Attenuation of high-frequency P and S waves in the crust of Southeastern Korea[J], Bull Seism Soc Amer, 91; 1 867-1 874
Kinoshita S. 1994. Frequency-dependent attenuation of shear waves in the crust of the Southern Kanto area, Japan[J]. Bull Seism Soc Amer, 84: 1 387-1 396
Ordaz M. 1992. Source spectra and spectral attenuation of seismic waves from Mexican earthquake and evidence of amplification in the hill zone of Mexicao city[J]. Bull Seism Soc Amer, 82: 24-43
Sato H. 1980. Q-1 value for S-wave under the Kanto district in Japan[J], Zisin, 33, 541-543
Sato H. 1989. Broadening of seismogram envelops in the randomly inhomogeneous lithosphere based on the parabolic ap-proximation: Southeastern Honshu, Japan[J]. J Geophys Res, 94: 17 735 - 17 747
Sato H. 1992. Thermal structure of the mantle wedge beneath Northeastern Japan:magmatism in an island arc from the combined data of seismic anelasticity and velocity and heat flow[J]. Volcanol Geothem Res, 51: 237 - 252
Shi Jinghua, Kin W Y, Richard P G. 1998. The corner frequency and stress drops of intraplate earthquake in the northeastern United States[J]. Bull Seism Soc Amer, 88: 531 - 542
Singh S K, Ordaz M, Dattatrayam R S. 1999. A spectral analysis of the 21 May 1997 Jabalpur India, earthquake and estimation of ground motion from future earthquakes in the India shield region[J]. Bull Seism Soc Amer, 89: 1 620 -1 830
Yoshimoto K, Sato H, Yoshihisa. et al. 1993. Frequency-dependent attenuation of P and S waves in the Kanto area, Japan, based on the coda-normalization method[J]. Geopkys J Int, 114: 165-174
Yoshimoto K, Sato H, Yoshihisa I, et al. 1998. Frequency-dependent attenuation of high-frequency P and S waves in the upper crust in western Nagano, Japan[J]. Pure Appl Geophys, 153. 489-502
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