2015年3月新不列颠<i>M</i><sub>S</sub>7.4地震震源及邻区构造应力场特征

doi:10.6038/cjg20170313

摘要
图/表
参考文献
相关文章 (15)

全文: PDF (6474 KB) HTML (1 KB)
输出: BibTeX | EndNote (RIS)

摘要 2015年3月30日至5月15日，巴布亚新几内亚-新不列颠地区发生了一系列地震.为研究该地区的构造应力环境及孕震背景，本文基于Global CMT目录，对新不列颠区域浅部进行构造应力场反演，拟得到高精度的应力图像.反演结果显示：（1）沿着南、北俾斯麦块体边界的区域构造应力场呈走滑体系，最大主压应力轴方位呈SWW-NEE向.（2）所罗门海的NW和NE走向的海沟处于压缩状态，所罗门海块体向新不列颠和所罗门群岛俯冲的板块弯曲部分是局部拉张.（3）受俯冲带的北向推挤，南俾斯麦板块顺时针旋转的挤压，太平洋板块向西部运动汇聚作用，新不列颠岛东北部与新爱尔兰岛南部交汇区域呈现明显非均匀应力状态.（4）此次地震序列的大多数走滑型和逆冲型地震，可能是所罗门海块体俯冲运动，和南俾斯麦块体与太平洋板块的近EW向挤压作用共同引发.

	服务

	把本文推荐给朋友
	加入我的书架
	加入引用管理器
	E-mail Alert
	RSS
	作者相关文章
	崔华伟
	万永革
	黄骥超
	李祥
	高熹微
	闫睿

关键词 ：震源机制, 构造应力场, 新不列颠, 俯冲带, 海沟

Abstract：A series of earthquakes occurred in New Britain, Papua New Guinea from March 30 to May 15, 2015. This work attempted to determine the stress field in the source region of this event and analyze its preparation mechanism. The focal mechanism solutions in the source and adjacent areas are collected from the global CMT catalogue. The tectonic stress field in the New Britain area is inverted using the focal mechanism data. The results are as follows. (1) The north and south boundary zones of the Bismarck block are in strike-slip stress regime with compressive stress in SWW-NEE diection. (2) The trenches of the Solomon Sea trending NW and NE direction are of compression. The bending portion of the Solomon Sea block subducting beneath the New Britain and Solomon Islands is in an extension state. (3) Under the NS compression of the subduction zone, extrusion caused by the clockwise rotation of the South Bismarck block, and the influence of the westward motion of the Pacific plate, the stress field in the joint region of New Britain and southern New Ireland is extremely heterogeneous. (4) The majority of the strike-slip and thrust earthquakes are produced by both the subducting of the Solomon Sea block and the EW-directed compression between the South Bisimark block and the Pacific plate.

Key words： Focal mechanism Tectonic stress field New Britain Subduction zone Trench

收稿日期: 2016-03-30

PACS:

P315

基金资助:河北省高校学科拔尖人才选拔与培养计划、河北省地震科技星火计划（DZ20140101002）和中央高校基本科研业务专项资金（创新项目团队资助计划）（ZY20110101）共同资助.

通讯作者: 万永革,男,1967年生,研究员,主要从事构造应力场、地震应力触发等方面研究工作.E-mail:wanyg217217@vip.sina.com.cn E-mail: wanyg217217@vip.sina.com.cn

作者简介: 崔华伟,男,1990年生,在读硕士研究生,主要从事震源机制、构造应力场等研究.E-mail:cuihuawei19900920@163.com

链接本文:

http://www.geophy.cn/CN/10.6038/cjg20170313 或 http://www.geophy.cn/CN/Y2017/V60/I3/985

Abers G A, Roecker S W. 1991. Deep structure of an arc-continent collision:Earthquake relocation and inversion for upper mantle P and S wave velocities beneath Papua New Guinea. J. Geophys. Res., 96(B4):6379-6401.
Aki K, Richards P G. 1980. Quantitative Seismology:Theory and Methods. San Francisco:W H Freeman, 1-557.
Angelier J. 1979. Determination of the mean principal directions of stresses for a given fault population. Tectonophysics, 56(3-4):T17-T26.
Benz H M, Herman M, Tarr A C, et al. 2011. Seismicity of the Earth 1900-2010 New Guinea and vicinity. USGS Open-File Report 2010-1083-H.
Bird P. 2003. An updated digital model of plate boundaries. Geochem. Geophys. Geosyst., 4(3):1027.
Christova C, Scholz C H. 2003. Stresses in the Vanuatu subducting slab:A test of two hypotheses. Geophys. Res. Lett., 30(15):1790.
Christova C. 2004. Stress field in the Ryukyu-Kyushu Wadati-Benioff zone by inversion of earthquake focal mechanisms. Tectonophysics, 384(1-4):175-189.
Christova C V. 2015. Spatial distribution of the contemporary stress field in the Kurile Wadati-Benioff zone by inversion of earthquake focal mechanisms. Journal of Geodynamics, 83:1-17.
Curtis J W. 1973. Plate tectonics and the Papua-New Guinea-Solomon Islands region. J. Geol. Soc. Aust., 20(1):21-35.
Davies H L, Symonds P A, Ripper I D. 1984. Structure and evolution of the southern Solomon Sea region. BMR J. Aust. Geol. Geophys., 9(1):49-68.
DeMets C, Gordon R G, Argus D F, et al. 1994. Effect of recent revisions to the geomagnetic reversal time scale on estimates of current plate motions. Geophys. Res. Lett., 21(20):2191-2194.
Efron B, Tibshirani R. 1986. Bootstrap methods for standard errors, confidence intervals, and other measures of statistical accuracy. Statistical Science, 1(1):54-75.
Etchecopar A, Vasseur G, Daignieres M. 1981. An inverse problem in microtectonics for the determination of stress tensors from fault striation analysis. J. Struct. Geol., 3(1):51-65.
Finlayson D M, Cull J P. 1973. Structural profiles in the New Britain/New Ireland region. J. Geol. Soc. Aust., 20(1):37-47.
Gephart J W, Forsyth D W. 1984. An improved method for determining the regional stress tensor using earthquake focal mechanism data:Application to the San Fernando earthquake sequence. J. Geophys. Res., 89(B11):9305-9320.
Hamilton W B. 1979. Tectonics of the Indonesian region. Professional Paper 1087. Washington, DC:US Government Printing Office, 1-345.
Hardebeck L L, Michael A J. 2006. Damped regional-scale stress inversions:Methodology and examples for southern California and the Coalinga aftershock sequence. J. Geophys. Res.,111, B11310, doi:10.1029/2005JB004144.
Heidbach O, Tingay M, Barth A, et al. 2010. Global crustal stress pattern based on the World Stress Map database release 2008. Tectonophysics, 482(1-4):3-15.
Holm R J, Richards S W. 2013. A re-evaluation of arc-continent collision and along-arc variation in the Bismarck Sea region, Papua New Guinea. Australian Journal of Earth Sciences, 60(5):605-619.
Huang J C, Wan Y G, Sheng S Z, et al. 2016. Heterogeneity of present-day stress field in the Tonga-Kermadec subduction zone and its geodynamic significance. Chinese J. Geophys. (in Chinese), 59(2):578-592, doi:10.6038/cjg20160216.
Isacks B, Oliver J, Sykes L R. 1968. Seismology and the new global tectonics. J. Geophys. Res., 73(B18):5855-5899.
Johnson R W. 1976. Potassium variation across the New Britain volcanic arc. Earth Planet. Sci. Lett., 31(1):184-191.
Johnson T, Molnar P. 1972. Focal mechanisms and plate tectonics of the southwest Pacific. J. Geophys. Res., 77(B26):5000-5032.
Krause D C. 1973. Crustal plates of the Bismarck and Solomon Seas.//Fraser R. Oceanography of the South Pacific 1972. New Zealand National Commission for UNESCO, Wellington, 271-280.
Kumar A, Wagner L S, Beck S L, et al. 2016. Seismicity and state of stress in the central and southern Peruvian flat slab. Earth Planet. Sci. Lett., 441:71-80.
Le Pichon X. 1970. Correction to Paper by Xavier Le Pichon 'Sea-floor spreading and continental drift'. J. Geophys. Res., 75(14):2793.
Martínez-Garzón P, Kwiatek G, Ickrath M, et al. 2014. MSATSI:A MATLAB package for stress inversion combining solid classic methodology, a new simplified user-handling, and a visualization tool. Seismol. Res. Lett., 85(4):896-904.
McKenzie D P. 1969. The relation between fault plane solutions for earthquakes and the directions of the principal stresses. Bull. Seismol. Soc. Am., 59(2):591-601.
Meighan H E, Pulliam J, Brink U, et al. 2013. Seismic evidence for a slab tear at the Puerto Rico Trench. J. Geophys. Res., 118(6):2915-2923.
Michael A J. 1984. Determination of stress from slip data:faults and folds. J. Geophys. Res., 89(B13):11517-11526.
Michael A J. 1987. Use of focal mechanisms to determine stress:A control study. J. Geophys. Res., 92(B1):357-368.
Mori J. 1989. The New Ireland earthquake of July 3, 1985 and associated seismicity near the Pacific Solomon Sea-Bismarck Sea triple junction. Phys. Earth Planet Int., 55(1-2):144-153.
Reynolds S D, Mildren S D, Hillis R R, et al. 2006. Constraining stress magnitudes using petroleum exploration data in the Cooper-Eromanga Basins, Australia. Tectonophysics, 415(1-4):123-140.
Schwartz S Y, Lay T, Ruff L J. 1988. Source process of the great 1971 Solomon Islands doublet. Phys. Earth Planet. Int., 56(3-4):294-310.
Taylor B, Crook K A W, Sinton J M, et al. 1991. Manus Basin, Papua New Guinea, SeaMARC II sidescan sonar imagery, bathymetry, magnetic anomalies, and free air gravity anomalies. Pacific Seafloor Atlas, Sheet 7, scale 1:1000000. Hawaii Institute Geophysics, Honolulu.
Tregoning P, Lambeck K, Stolz A, et al. 1998. Estimation of current plate motions in Papua New Guinea from Global Positioning System observations. J. Geophys. Res., 103(B6):12181-12203.
Tregoning P, McQueen H, Lambeck K, et al. 2000. Present-day crustal motion in Papua New Guinea. Earth, Planet. Space, 52(10):727-730.
Tsukahara H, Ikeda R, Omura K. 1996. In-situ stress measurement in an earthquake focal area. Tectonophysics, 62(1-4):281-290.
Vernik L, Zoback M D. 1992. Estimation of maximum horizontal principal stress magnitude from stress-induced well bore breakouts in the Cajon Pass scientific research borehole. J. Geophys. Res., 97(B4):5109-5119.
Wada I, Mazzotti S, Wang K L. 2010. Intraslab stresses in the Cascadia subduction zone from inversion of earthquake focal mechanisms. Bull. Seismol. Soc. Am., 100(5A):2002-2013.
Wallace L M, Stevens C, Silver E, et al. 2004. GPS and seismological constraints on active tectonics and arc-continent collision in Papua New Guinea:Implications for mechanics of microplate rotations in a plate boundary zone. J. Geophys. Res., 109, B05404, doi:10.1029/2003JB002481.
Wan Y G, Wu Y M, Sheng S Z, et al. 2011. Preliminary result of Taiwan 3-D stress field from P wave polarity data. Chinese J. Geophys. (in Chinese), 54(11):2809-2818, doi:10.3969/j.issn.0001-5733.2011.11.011.
Wan Y G. 2015. A grid search method for determination of tectonic stress tensor using qualitative and quantitative data of active faults and its application to the Urumqi area. Chinese J. Geophys. (in Chinese), 58(9):3144-3156, doi:10.6038/cjg20150911.
Wan Y G, Sheng S Z, Huang J C, et al. 2016. The grid search algorithm of tectonic stress tensor based on focal mechanism data and its application in the boundary zone of China, Vietnam and Laos. J. Earth Sci., 27(5):777-785.
Wessel P, Smith W H F. 1995. New version of the generic mapping tools released. EOS Trans. AGU, 76(33):329.
Wu H Y, Ma K F, Zoback M, et al. 2007. Stress orientations of Taiwan Chelungpu-fault drilling project (TCDP) hole-A as observed from geophysical logs. Geophys. Res. Lett.,34, L01303,doi:10.1029/2006GL028050.
Wu W N, Kao H, Hsu S K, et al. 2010. Spatial variation of the crustal stress field along the Ryukyu-Taiwan-Luzon convergent boundary. J. Geophys. Res., 115,B11401, doi:10.1029/2009JB007080.
Xu Z H, Yan M, Zhao Z H. 1983. Evaluation of the direction of tectonic stress in North China from recorded data of a large number of small earthquakes. Acta Seismologica Sinica (in Chinese), 5(3):268-279.
Xu Z H, Ge S M. 1984. Stress field in the Fuyun, Xinjiang earthquake fracture zone determined by fitting fault slip vector data. Acta Seismologica Sinica (in Chinese), 6(4):395-404.
Zoback M L. 1992. First- and second-order patterns of stress in the lithosphere:the world stress map project. J. Geophys. Res., 97(B8):11703-11728.
Zoback M D, Healy J H. 1992. In situ stress measurements to 3.5 km depth in the Cajon Pass scientific research borehole:implications for the mechanics of crustal faulting. J. Geophys. Res., 97(B4):5039-5057.
附中文参考文献
黄骥超, 万永革, 盛书中等. 2016. 汤加-克马德克俯冲带现今非均匀应力场特征及其动力学意义. 地球物理学报, 59(2):578-592, doi:10.6038/cjg20160216.
万永革, 吴逸民, 盛书中等. 2011. P波极性数据所揭示的台湾地区三维应力结构的初步结果. 地球物理学报, 54(11):2809-2818, doi:10.3969/j.issn.0001-5733.2011.11.011.
万永革. 2015. 联合采用定性和定量断层资料的应力张量反演方法及在乌鲁木齐地区的应用. 地球物理学报, 58(9):3144-3156, doi:10.6038/cjg20150911.
许忠淮, 阎明, 赵仲和. 1983. 由多个小地震推断的华北地区构造应力场的方向. 地震学报, 5(3):268-279.
许忠淮, 戈澍谟. 1984. 用滑动方向拟合法反演富蕴地震断裂带应力场. 地震学报, 6(5):395-404.