CAN THE DD-RELOCATED EARTHQUAKE CATALOGUE BE USED FOR THE STATISTICAL PARAMETERS OF AN EARTHQUAKE SEQUENCE？—A CASE STUDY OF THE SPATIAL DISTRIBUTION OF B-VALUES FOR THE AFTERSHOCKS OF THE 2014 LUDIAN MS6.5 EARTHQUAKE

doi:10.3969/j.issn.0253-4967.2014.04.024

Abstract

Abstract:

Relocated earthquake catalogue by double difference(DD)algorithm, while significantly improving the location precision, suffers from the degeneration of catalogue completeness. One of the questions subject to discussion is whether such DD-relocated catalogue is really an improvement, or otherwise a drawback, when calculating the spatially dependent statistical parameters of seismicity. In such statistical calculation, catalogue completeness is one of the key issues determining the quality of the result. Investigating this problem, this paper carries out a case study on the August 3, 2014, Ludian, Yunnan, M_S6.5 earthquake sequence. Aftershocks within 40 days since the mainshock are analyzed using the routine catalogue provided by the national seismic network and a DD-relocated catalogue. The Gutenberg-Richter b-value, as well as its spatial distribution, from both catalogues, are calculated and compared. Results show that the degeneration of catalogue completeness of the DD-relocated catalogue depends on the clustering property of the earthquakes to much extent. Degeneration of catalogue completeness occurs at the margin of an earthquake cluster. Distribution of b-values based on the DD-catalogue provides clues to the source properties of the Ludian earthquake.

Key words: Ludian M_S6.5 earthquake, b-value, aftershock sequence, double difference relocation

摘要：

双差(DD)定位后的地震目录, 较之地震台网给出的常规目录在精准度上有了提高, 但同时完整性也有一定的下降.DD目录能否用于统计地震学参数的计算？在统计地震学参数的计算中, 目录完整性是一个最基本的问题.文中针对2014年8月3日云南鲁甸M_S6.5地震后40天的余震序列, 对比分析了台网常规定位目录和一个DD目录, 比较了分别用2个目录得到的余震序列的b值, 讨论了DD目录用于计算b值等统计地震学参数的可信程度.结果表明, 对于地震序列, DD目录完整性的下降与地震丛集性质相关, 在地震丛集的边缘完整性明显下降, 但在丛集的内部下降程度较低.用DD定位后的序列分布, 讨论了鲁甸地震震源性质的相关问题.

关键词: 鲁甸M_S6.5地震, b值, 余震序列, 双差定位

CLC Number:

P315.2

ZHANG Sheng-feng, WU Zhong-liang, FANG Li-hua. CAN THE DD-RELOCATED EARTHQUAKE CATALOGUE BE USED FOR THE STATISTICAL PARAMETERS OF AN EARTHQUAKE SEQUENCE？—A CASE STUDY OF THE SPATIAL DISTRIBUTION OF B-VALUES FOR THE AFTERSHOCKS OF THE 2014 LUDIAN M_S6.5 EARTHQUAKE[J]. SEISMOLOGY AND GEOLOGY, 2014, 36(4): 1244-1259.

张盛峰, 吴忠良, 房立华. 双差(DD)定位地震目录能用于地震序列的统计地震学参数计算吗？——云南鲁甸M_S6.5地震序列b值的空间分布[J]. 地震地质, 2014, 36(4): 1244-1259.

References

陈石, 王青华, 王谦身, 等. 2014. 云南鲁甸M_S6.5地震震源区和周边三维密度结构及重力场变化［J］. 地球物理学报, 57(9): 3080—3090.
CHEN Shi, WANG Qing-hua, WANG Qian-shen, et al. 2014. The 3D density and gravity change of Ludian M_S6.5 Yunnan epicenter and surrounding regions ［J］. Chinese J Geophys, 57(9): 3080—3090(in Chinese).
黄媛, 吴建平, 张天中, 等. 2008. 汶川8.0级大地震及其余震序列重定位研究［J］. 中国科学(D辑), 38(10): 1242—1249.
HUANG Yuan, WU Jian-ping, ZHANG Tian-zhong, et al. 2008. Relocation of the M_S8.0 Wenchuan earthquake and its aftershock sequence ［J］. Science in China(Ser D), 51(12): 1703—1711.
房立华, 吴建平, 王未来, 等. 2014. 云南鲁甸M_S6.5地震余震重定位及其发震构造［J］. 地震地质, 36(4): 1173—1185. doi: 10.3969/j.issn.0253-4967.2014.04.019.
FANG Li-hua, WU Jian-ping, WANG Wei-lai, et al. 2014. Relocation of the aftershock sequence of the M_S6.5 Ludian earthquake and its seismogenic structure ［J］. Seismology and Geology, 36(4): 1173—1185(in Chinese).
徐锡伟, 江国焰, 于贵华, 等. 2014. 鲁甸6.5级地震发震断层判定及其构造属性讨论［J］. 地球物理学报, 57(9): 3060—3068.
XU Xi-wei, JIANG Guo-yan, YU Gui-hua, et al. 2014. Discussion on seismogenic fault of the Ludian M_S6.5 earthquake and its tectonic attribution ［J］. Chinese J Geophys, 57(9): 3060—3068(in Chinese).
刘成利, 郑勇, 熊熊, 等. 2014. 利用区域宽频带数据反演鲁甸M_S6.5地震震源破裂过程［J］. 地球物理学报, 57(9): 3028—3037.
LIU Cheng-li, ZHENG Yong, XIONG Xiong, et al. 2014. Rupture process of the M_S6.5 Ludian earthquake constrained by regional broadband seismograms ［J］. Chinese J Geophys, 57(9): 3028—3037(in Chinese).
吕坚, 苏金蓉, 靳玉科, 等. 2008. 汶川8.0级地震序列重新定位及其发震构造初探［J］. 地震地质, 30(4): 917—925.
LÜ Jian, SU Jin-rong, JIN Yu-ke, et al. 2008. Discussion on relocation and seismo-tectonics of the M_S8.0 Wenchuan earthquake sequences ［J］. Seismology and Geology, 30(4): 917—925(in Chinese).
吕鹏, 丁志峰, 朱露培. 2011. 结合波形互相关的双差定位方法在2008年汶川地震余震序列中的应用［J］. 地震学报, 33(4): 407—419.
LÜ Peng, DING Zhi-feng, ZHU Lu-pei. 2011. Application of double-difference relocation technique to aftershocks of 2008 Wenchuan earthquake using waveform cross-correlation ［J］. Acta Seismologica Sinica, 33(4): 407—419(in Chinese).
徐涛, 张明辉, 田小波, 等. 2014. 丽江-清镇剖面上地壳速度结构及其与鲁甸M_S6.5地震孕震环境的关系［J］. 地球物理学报, 57(9): 3069—3079.
XU Tao, ZHANG Ming-hui, TIAN Xiao-bo, et al. 2014. Upper crustal velocity of Lijiang-Qingzhen profile and its relationship with the seismogenic environment of the M_S6.5 Ludian earthquake ［J］. Chinese J Geophys, 57(9): 3069—3079(in Chinese).
许力生, 张旭, 严川, 等. 2014. 基于勒夫波的鲁甸M_S6.5地震震源复杂性分析［J］. 地球物理学报, 57(9): 3006—3017.
XU Li-sheng, ZHANG Xu, YAN Chuan, et al. 2014. Analysis of the Love wave for the complexity of the Ludian M_S6.5 earthquake ［J］. Chinese J Geophys, 57(9): 3006—3017(in Chinese).
王未来, 吴建平, 房立华, 等. 2014. 2014年云南鲁甸M_S6.5地震序列的双差定位［J］. 地球物理学报, 57(9): 3042—3051.
WANG Wei-lai, WU Jian-ping, FANG Li-hua, et al. 2014. Double difference location of the Ludian M_S6.5 earthquake sequences in Yunnan Province in 2014 ［J］. Chinese J Geophys, 57(9): 3042—3051(in Chinese).
张振国, 孙耀充, 徐建宽, 等. 2014. 2014年8月3日云南鲁甸地震强地面运动初步模拟及烈度预测［J］. 地球物理学报, 57(9): 3038—3041.
ZHANG Zhen-guo, SUN Yao-chong, XU Jian-kuan, et al. 2014. Preliminary simulation of the strong ground motion for Ludian, Yunnan earthquake of the August 2014, and hazard implication ［J］. Chinese J Geophys, 57(9): 3038—3041(in Chinese).
张勇, 许力生, 陈运泰, 等. 2014. 2014年8月3日云南鲁甸M_W6.1(M_S6.5)地震破裂过程［J］. 地球物理学报, 57(9): 3052—3059.
ZHANG Yong, XU Li-sheng, CHEN Yun-tai, et al. 2014. Rupture process of the 3 August 2014 Ludian, Yunnan, M_W6.1(M_S6.5)earthquake ［J］. Chinese J Geophys, 57(9): 3052—3059(in Chinese).
张广伟, 雷建设, 梁姗姗, 等. 2014. 2014年8月3日云南鲁甸M_S6.5地震序列重定位与震源机制研究［J］. 地球物理学报, 57(9): 3018—3027.
ZHANG Guang-wei, LEI Jian-she, LIANG Shan-shan, et al. 2014. Relocations and focal mechanism solutions of the 3 August 2014 Ludian Yunnan M_S6.5 earthquake sequence ［J］. Chinese J Geophys, 57(9): 3018—3027(in Chinese).
赵博, 石玉涛, 高原. 2011. 汶川M_S8.0地震及余震序列重新定位［J］. 地震, 31(2):1—10.
ZHAO Bo, SHI Yu-tao, GAO Yuan. 2011. Relocation of the Wenchuan M_S8.0 earthquake sequence ［J］. Earthquake, 31(2): 1—10(in Chinese).
朱艾斓, 徐锡伟, 刁桂苓,等. 2008. 汶川M_S8.0地震部分余震重新定位及地震构造初步分析［J］. 地震地质, 30(3): 759—767.
ZHU Ai-lan, XU Xi-wei, DIAO Gui-ling, et al. 2008. Relocation of the M_S8.0 Wenchuan earthquake sequence in part: Preliminary seismotectonic analysis ［J］. Seismology and Geology, 30(3): 759—767(in Chinese).
Aki K. 1965. Maximum likelihood estimate of b in the formula logN=a-bm and its confidence limits ［J］. Bull Earthq Res Inst Univ, 43: 137—139.
Nanjo K Z, Schorlemmer D, Woessner J, et al. 2010. Earthquake detection capability of the Swiss Seismic Network ［J］.Geophys J Int, 181(3): 1713—1724.
Ogata Y, Imoto M, Katsura K. 1991. 3-D spatial variation of b-values of magnitude-frequency distribution beneath the Kanto District, Japan ［J］. Geophys J Int, 104(1): 135—146.
Schorlemmer D, Mele F, Marzocchi W. 2010. A completeness analysis of the National Seismic Network of Italy ［J］. J Geophys Res Solid Earth, 115(B4): B04308.
Utsu T. 1965. A method for determining the value of b in a formula logN=a-bm showing magnitude-frequency relation for earthquakes ［J］. Geophys Bull Hokkaido Univ, 13: 99—103(in Japanese with English abstract).
Waldhauser F, Ellsworth W L. 2000. A double-difference earthquake location algorithm: Method and application to the northern Hayward Fault, California ［J］. Bull Seism Soc Am, 90: 1353—1368.
Waldhauser F, Ellsworth W L. 2002. Fault structure and mechanics of the Hayward Fault, California, from double-difference earthquake locations ［J］. J Geophys Res Solid Earth, 107(B3): ESE 3-1-ESE3—15.
Wiemer S, Wyss M. 1997. Mapping the frequency-magnitude distribution in asperities: An improved technique to calculate recurrence times ［J］. J Geophys Res, 102(B7): 15115—15128.
Wiemer S, Wyss M. 2000. Minimum magnitude of completeness in earthquake catalogs: Examples from Alaska, the western United States, and Japan ［J］. Bull Seism Soc Am, 90(4): 859—869.
Wyss M. 1973. Towards a physical understanding of the earthquake frequency distribution ［J］.Geophys J R Astron Soc, 31: 341—359.

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