Advanced Search

EPP

地球与行星物理

ISSN  2096-3955

CN  10-1502/P

Citation: Xu Zhang, Zhen Fu, LiSheng Xu, ChunLai Li, Hong Fu, 2019: The 2018 MS 5.9 Mojiang Earthquake: Source model and intensity based on near-field seismic recordings, Earth and Planetary Physics, 3, 268-281. doi: 10.26464/epp2019028

2019, 3(3): 268-281. doi: 10.26464/epp2019028

SOLID EARTH: SEISMOLOGY

The 2018 MS 5.9 Mojiang Earthquake: Source model and intensity based on near-field seismic recordings

1. 

Institute of Geophysics, China Earthquake Administration, Beijing 100081, China

2. 

Earthquake Administration of Yunnan Province, Kunming 650224, China

Corresponding author: LiSheng Xu, xuls@cea-igp.ac.cn

Received Date: 2018-12-08
Web Publishing Date: 2019-05-01

On September 8, 2018, an MS 5.9 earthquake struck Mojiang, a county in Yunnan Province, China. We collect near-field seismic recordings (epicentral distances less than 200 km) to relocate the mainshock and the aftershocks within the first 60 hours to determine the focal mechanism solutions of the mainshock and some of the aftershocks and to invert for the finite-fault model of the mainshock. The focal mechanism solution of the mainshock and the relocation results of the aftershocks constrain the mainshock on a nearly vertical fault plane striking northeast and dipping to the southeast. The inversion of the finite-fault model reveals only a single slip asperity on the fault plane. The major slip is distributed above the initiation point, ~14 km wide along the down-dip direction and ~14 km long along the strike direction, with a maximal slip of ~22 cm at a depth of ~6 km. The focal mechanism solutions of the aftershocks show that most of the aftershocks are of the strike-slip type, a number of them are of the normal-slip type, and only a few of them are of the thrust-slip type. On average, strike-slip is dominant on the fault plane of the mainshock, as the focal mechanism solution of the mainshock suggests, but when examined in detail, slight thrust-slip appears on the southwest of the fault plane while an obvious part of normal-slip appears on the northeast, which is consistent with what the focal mechanism solutions of the aftershocks display. The multiple types of aftershock focal mechanism solutions and the slip details of the mainshock both suggest a complex tectonic setting, stress setting, or both. The intensity contours predicted exhibit a longer axis trending from northeast to southwest and a maximal intensity of Ⅷ around the epicenter and in the northwest.

Key words: 2018 MS 5.9 Mojiang Earthquake, near-field seismic recording, finite-fault model, intensity prediction, focal mechanism solution

Antolik, M., and Dreger, D. S. (2003). Rupture process of the 26 January 2001 Mw 7.6 Bhuj, India, earthquake from teleseismic broadband data. Bull. Seismol. Soc. Am., 93(3), 1235–1248. https://doi.org/10.1785/0120020142

Data Management Centre of China National Seismic Network. (2007). Waveform data of China National Seismic Network. Institute of Geophysics, China Earthquake Administration.222

Gan, W. J., Zhang, P. Z., Shen, Z. K., Niu, Z. J., Wang, M., Wan, Y. G., Zhou, D. M., and Cheng, J. (2007). Present –day crustal motion within the Tibetan Plateau inferred from GPS measurements. J. Geophys. Res.: Solid Earth, 112(B8), B08416. https://doi.org/10.1029/2005JB004120

Graizer, V. (2006). Tilts in strong ground motion. Bull. Seismol. Soc. Am., 96(6), 2090–2102. https://doi.org/10.1785/0120060065

Hartzell, S. H., and Heaton, T. H. (1983). Inversion of strong ground motion and teleseismic waveform data for the fault rupture history of the 1979 Imperial Valley, California, earthquake. Bull. Seismol. Soc. Am., 73(6A), 1553–1583.

Jin, H. L., Gao, Y., Su, X. N., and Fu, G. Y. (2019). Contemporary crustal tectonic movement in the southern Sichuan-Yunnan block based on dense GPS observation data. Earth Planet. Phys., 3(1), 53–61. https://doi.org/10.26464/epp2019006

Lay, T., Ammon, C. J., Hutko, A. R., and Kanamori, H. (2010). Effects of kinematic constraints on teleseismic finite-source rupture inversions: Great peruvian earthquakes of 23 June 2001 and 15 August 2007. Bull. Seismol. Soc. Am., 100(3), 969–994. https://doi.org/10.1785/0120090274

Molnar, P., and Tapponnier, P. (1975). Cenozoic tectonics of Asia: Effects of a continental collision. Science, 189(4201), 419–426. https://doi.org/10.1126/science.189.4201.419

Wald, D. J., Quitoriano, V., Dengler, L. A., and Dewey, J. W. (1999a). Utilization of the internet for rapid community intensity maps. Seismol. Res. Lett., 70(6), 680–697. https://doi.org/10.1785/gssrl.70.6.680

Wald, D. J., Quitoriano, V., Heaton, T. H., and Kanamori, H. (1999b). Relationships between peak ground acceleration, peak ground velocity, and modified mercalli intensity in California. Earthq. Spectra, 15(3), 557–564. https://doi.org/10.1193/1.1586058

Waldhauser, F., and Ellsworth, W. L. (2000). A double-difference earthquake location algorithm: Method and application to the Northern Hayward Fault, California. Bull. Seismol. Soc. Am., 90(6), 1353–1368. https://doi.org/10.1785/0120000006

Wang, C. Y., Chan, W. W., and Mooney, W. D. (2003). Three-dimensional velocity structure of crust and upper mantle in southwestern China and its tectonic implications. J. Geophys. Res., 108(B9), 2442. https://doi.org/10.1029/2002JB001973

Wang, R. J. (1999). A simple orthonormalization method for stable and efficient computation of Green's functions. Bull. Seismol. Soc. Am., 89(3), 733–741.

Wang, R. J., Parolai, S., Ge, M., Jin, M., Walter, T. R., and Zschau, J. (2013). The 2011 Mw 9.0 Tohoku earthquake: Comparison of GPS and strong-motion data. Bull. Seismol. Soc. Am., 103(2B), 1336–1347. https://doi.org/10.1785/0120110264

Ward, S. N., and Barrientos, S. E. (1986). An inversion for slip distribution and fault shape from geodetic observations of the 1983, Borah Peak, Idaho, Earthquake. J. Geophys. Res.: Solid Earth, 91(B5), 4909–4919. https://doi.org/10.1029/JB091iB05p04909

Wessel, P., and Smith, W. H. F. (1998). New, improved version of generic mapping tools released. Eos Trans. AGU, 79(47), 579. https://doi.org/10.1029/98EO00426

Xu, L. S., Du, H. L., Yan, C., and Li, C. L. (2013a). A method for determination of earthquake hypocentroid: time-reversal imaging technique I–Principle and numerical tests. Chinese J. Geophys. (in Chinese) , 56(4), 1190–1206. https://doi.org/10.6038/cjg20130414

Xu, L. S., Yan, C., Zhang, X., and Li, C. L. (2013b). A method for determination of earthquake hypocentroid: Time-reversal imaging technique–An examination based on people-made earthquakes. Chinese J. Geophys. (in Chinese) , 56(12), 4009–4027. https://doi.org/10.6038/cjg20131207

Xu, L. S., Zhang, X., and Li, C. L. (2018). Which velocity model is more suitable for the 2017 MS7.0 Jiuzhaigou earthquake?. Earth Planet. Phys., 2(2), 163–169.

Xu, L. S., Zhang, X., Wei, Q., and Li, C. L. (2016). A method for estimating the earthquake intensity caused by a finite-dynamic source. Chinese J. Geophys. (in Chinese) , 59(10), 3684–3695. https://doi.org/10.6038/cjg20161015

Yagi, Y., Mikumo, T., Pacheco, J., and Reyes, G. (2004). Source Rupture Process of the Tecomán, Colima, Mexico Earthquake of 22 January 2003, Determined by Joint Inversion of Teleseismic Body-Wave and Near-Source Data. Bull. Seismol. Soc. Am., 94(5), 1795–1807. https://doi.org/10.1785/012003095

Yan, C., and Xu, L. S. (2014). An inversion technique for the mechanisms of local and regional earthquakes: generalized polarity and amplitude technique (I)–Principle and numerical tests. Chinese J. Geophys. (in Chinese) , 57(8), 2555–2572. https://doi.org/10.6038/cjg20140816

Yan, C., Xu, L. S., Zhang, X., Li, C. L., and Xu, K. S. (2015). An inversion technique for mechanisms of local and regional earthquakes: generalized polarity and amplitude technique (II): An application to real seismic events. Chinese J. Geophys. (in Chinese) , 58(10), 3601–3614. https://doi.org/10.6038/cjg20151014

Yin, A., and Harrison, T. M. (2000). Geologic evolution of the Himalayan-Tibetan orogen. Annu. Rev. Earth Planet. Sci., 28, 211–280. https://doi.org/10.1146/annurev.earth.28.1.211

Zhang, K. L., Liang, S. M., and Gan W. J. (2019). Crustal strain rates of southeastern Tibetan Plateau derived from GPS measurements and implications to lithospheric deformation of the Shan-Thai terran. Earth Planet. Phys., 3(1), 45–52. https://doi.org/10.26464/epp2019005

Zhang, P. Z., Shen, Z. K., Wang, M., Gan, W. J., Bürgmann, R., Molnar, P., Wang, Q., Niu, Z. J., Sun, J. Z., … You, X. Z. (2004). Continuous deformation of the Tibetan Plateau from global positioning system data. Geology, 32(9), 809–812. https://doi.org/10.1130/G20554.1

Zhang, X., and Xu, L. S. (2015). Inversion of the apparent source time functions for the rupture process of the Nepal MS 8.1 earthquake. Chinese J. Geophys. (in Chinese) , 58(6), 1881–1890. https://doi.org/10.6038/cjg20150604

Zhang, X. (2016). Study on New Methods for Analysis of the Complexity of Source Rupture Process based on Apparent Source Time Functions (in Chinese). Beijing: Institute of Geophysics, China Earthquake Administration.222

Zhang, X., Feng, W. P., Xu, L. S., and Li, C. L. (2017a). The source-process inversion and the intensity estimation of the 2017 MS7.0 Jiuzhaigou earthquake. Chinese J. Geophys. (in Chinese) , 60(10), 4105–4116. https://doi.org/10.6038/cjg20171035

Zhang, X., Yan, C., Xu, L. S., and Li, C. L. (2017b). Source complexity of the 2016 Aketao MS 6.7 earthquake and its intensity. Chinese J. Geophys. (in Chinese) , 60(4), 1411–1422. https://doi.org/10.6038/cjg20170415

Zhang, Y., Feng, W. P., Chen, Y. T., Xu, L. S., Li, Z. H., and Forrest, D. (2012). The 2009 L’Aquila MW6.3 earthquake: a new technique to locate the hypocentre in the joint inversion of earthquake rupture process. Geophys. J. Int., 191(3), 1417–1426. https://doi.org/10.1111/j.1365-246X.2012.05694.x

Zhang, Y., Wang, R. J., Chen, Y. T., Xu, L. S., Du, F., Jin, M. P., Tu, H. W., and Dahm, T. (2014). Kinematic rupture model and hypocenter relocation of the 2013 MW 6.6 Lushan earthquake constrained by strong-motion and teleseismic data. Seismol. Res. Lett., 85(1), 15–22. https://doi.org/10.1785/0220130126

Zheng, X. F., Yao, Z. X., Liang, J. H., and Zheng, J. (2010). The role played and opportunities provided by IGP DMC of China national seismic network in Wenchuan earthquake disaster relief and researches. Bull. Seismol. Soc. Am., 100(5B), 2866–2872. https://doi.org/10.1785/0120090257

[1]

YuLan Li, BaoShan Wang, RiZheng He, HongWei Zheng, JiangYong Yan, Yao Li, 2018: Fine relocation, mechanism, and tectonic indications of middle-small earthquakes in the Central Tibetan Plateau, Earth and Planetary Physics, 2, 406-419. doi: 10.26464/epp2018038

[2]

LiSheng Xu, Xu Zhang, ChunLai Li, 2018: Which velocity model is more suitable for the 2017 MS7.0 Jiuzhaigou earthquake?, Earth and Planetary Physics, 2, 163-169. doi: 10.26464/epp2018016

[3]

JianHui Tian, Yan Luo, Li Zhao, 2019: Regional stress field in Yunnan revealed by the focal mechanisms of moderate and small earthquakes, Earth and Planetary Physics, 3, 243-252. doi: 10.26464/epp2019024

[4]

ZhiKun Ren, ZhuQi Zhang, PeiZhen Zhang, 2018: Different earthquake patterns for two neighboring fault segments within the Haiyuan Fault zone, Earth and Planetary Physics, 2, 67-73. doi: 10.26464/epp2018006

[5]

TianYu Zheng, YongHong Duan, WeiWei Xu, YinShuang Ai, 2017: A seismic model for crustal structure in North China Craton, Earth and Planetary Physics, 1, 26-34. doi: 10.26464/epp2017004

[6]

WeiMin Wang, JinLai Hao, ZhenXing Yao, 2018: Preliminary results for the rupture process of Jan. 10, 2018, Mw7.6 earthquake at east of Great Swan Island, Honduras, Earth and Planetary Physics, 2, 86-87. doi: 10.26464/epp2018010

[7]

Feng Long, GuiXi Yi, SiWei Wang, YuPing Qi, Min Zhao, 2019: Geometry and tectonic deformation of the seismogenic structure for the 8 August 2017 MS 7.0 Jiuzhaigou earthquake sequence, northern Sichuan, China, Earth and Planetary Physics, 3, 253-267. doi: 10.26464/epp2019027

[8]

Mei Li, Li Yao, YaLi Wang, Michel Parrot, Masashi Hayakawa, Jun Lu, HanDong Tan, Tao Xie, 2019: Anomalous phenomena in DC–ULF geomagnetic daily variation registered three days before the 12 May 2008 Wenchuan MS 8.0 earthquake, Earth and Planetary Physics. doi: 10.26464/epp2019030

[9]

Xin Zhou, Gabriele Cambiotti, WenKe Sun, Roberto Sabadini, 2018: Co-seismic slip distribution of the 2011 Tohoku (MW 9.0) earthquake inverted from GPS and space-borne gravimetric data, Earth and Planetary Physics, 2, 120-138. doi: 10.26464/epp2018013

[10]

TianJun Zhou, Bin Wang, YongQiang Yu, YiMin Liu, WeiPeng Zheng, LiJuan Li, Bo Wu, PengFei Lin, Zhun Guo, WenMin Man, Qing Bao, AnMin Duan, HaiLong Liu, XiaoLong Chen, Bian He, JianDong Li, LiWei Zou, XiaoCong Wang, LiXia Zhang, Yong Sun, WenXia Zhang, 2018: The FGOALS climate system model as a modeling tool for supporting climate sciences: An overview, Earth and Planetary Physics, 2, 276-291. doi: 10.26464/epp2018026

[11]

Md Moklesur Rahman, Ling Bai, 2018: Probabilistic seismic hazard assessment of Nepal using multiple seismic source models, Earth and Planetary Physics, 2, 327-341. doi: 10.26464/epp2018030

[12]

Bin Zhou, YanYan Yang, YiTeng Zhang, XiaoChen Gou, BingJun Cheng, JinDong Wang, Lei Li, 2018: Magnetic field data processing methods of the China Seismo-Electromagnetic Satellite, Earth and Planetary Physics, 2, 455-461. doi: 10.26464/epp2018043

[13]

YiJian Zhou, ShiYong Zhou, JianCang Zhuang, 2018: A test on methods for MC estimation based on earthquake catalog, Earth and Planetary Physics, 2, 150-162. doi: 10.26464/epp2018015

[14]

Zhi Wei, LianFeng Zhao, XiaoBi Xie, JinLai Hao, ZhenXing Yao, 2018: Seismic characteristics of the 15 February 2013 bolide explosion in Chelyabinsk, Russia, Earth and Planetary Physics, 2, 420-429. doi: 10.26464/epp2018039

[15]

Biao Guo, JiuHui Chen, QiYuan Liu, ShunCheng Li, 2019: Crustal structure beneath the Qilian Orogen Zone from multiscale seismic tomography, Earth and Planetary Physics, 3, 232-242. doi: 10.26464/epp2019025

[16]

JianPing Huang, JunGang Lei, ShiXun Li, ZhiMa Zeren, Cheng Li, XingHong Zhu, WeiHao Yu, 2018: The Electric Field Detector (EFD) onboard the ZH-1 satellite and first observational results, Earth and Planetary Physics, 2, 469-478. doi: 10.26464/epp2018045

[17]

YuXian Wang, XiaoCheng Guo, BinBin Tang, WenYa Li, Chi Wang, 2018: Modeling the Jovian magnetosphere under an antiparallel interplanetary magnetic field from a global MHD simulation, Earth and Planetary Physics, 2, 303-309. doi: 10.26464/epp2018028

[18]

Elizabeth A. Silber, 2018: Deployment of a short-term geophysical field survey to monitor acoustic signals associated with the Windsor Hum, Earth and Planetary Physics, 2, 351-358. doi: 10.26464/epp2018032

[19]

JinQiang Zhang, Yi Liu, HongBin Chen, ZhaoNan Cai, ZhiXuan Bai, LingKun Ran, Tao Luo, Jing Yang, YiNan Wang, YueJian Xuan, YinBo Huang, XiaoQing Wu, JianChun Bian, DaRen Lu, 2019: A multi-location joint field observation of the stratosphere and troposphere over the Tibetan Plateau, Earth and Planetary Physics, 3, 87-92. doi: 10.26464/epp2019017

[20]

XueMei Zhang, GuangBao Du, Jie Liu, ZhiGao Yang, LiYe Zou, XiYan Wu, 2018: An M6.9 earthquake at Mainling, Tibet on Nov.18, 2017, Earth and Planetary Physics, 2, 84-85. doi: 10.26464/epp2018009

Article Metrics
  • PDF Downloads()
  • Abstract views()
  • HTML views()
  • Cited by(0)
Catalog

Figures And Tables

The 2018 MS 5.9 Mojiang Earthquake: Source model and intensity based on near-field seismic recordings

Xu Zhang, Zhen Fu, LiSheng Xu, ChunLai Li, Hong Fu