河北平原地震带b值时空变化特征
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摘要
利用华北地区近44年地震资料,在区域地震序列完整性分析的基础上,用最小二乘法进行b值时间扫描计算,用最大似然法进行b值空间扫描计算。时间扫描中的b值为研究区内每个扫描窗口的平均b值,因此其变化幅度不大,基本保持在0.62~1.05之间。研究区b值空间分布范围基本维系在0.5~1.4,低b值区域为昌平—宝坻断裂段和唐山—迁安断裂段,变化范围为0.5~0.7,表明该区域地壳介质正处于相对高应力或闭锁状态,存在未来可能发生中强以上地震的潜在危险。
b-value is the basic parameter of seismic risk analysis and seismic prediction,describing the distribution characteristics of the magnitude frequency relation of earthquakes of study region.Actually it is a symbol that measures the seismicity levels in a certain region,and it is widely used in seismic prediction research and seismic risk analysis both at home and abroad.In this article,several important aspects of the influence of b value statistical are discussed.We draw some conclusions and hope to facilitate seismic prediction research.First of all,we studied the influence on the b-value by calculating seismic data integrity.Based on the observation bulletins and earthquake catalogues in the north China area,we analyzed temporal and spatial variations in seismic network monitoring capability.The effect of the bvalue curve to inspect network monitoring ability is discussed,and the results prove that the effect with regional b value curve fitting to ensure the network monitoring ability is not reliable.As the Hebei plain seismic belt is one of main activity areas of the strong earthquakes that occurred at the third and fourth activity times in North China,and it has complicated geological structure with relatively dynamic moderate-strong earthquakes in history and modern times.So according to seismic data records in the last 44 years,based on the complete analysis of seismic sequence in the district,least square method is used to conduct time-scanning calculations of b-value,and the maximum likelihood method is used to conduct space-scanning calculations of b-value.During the scanning time,b-value is the mean b-value of research zone in every scanning window,its amplitude of variation is not quite great,with a variation range of 0.62~1.05.Space-scanning results indicate that the space distribution range of bvalues basically stays within 0.5~1.4.The lowb-value zone is in the Tangshan-Qian'an section and the Changping-Baodi section,consequently,b-value range 0.5~0.7,which indicates that the earth crust medium of this region is in a state of high horizontal stress accumulation and it there is aprobability of a moderate strong earthquake in future.
引文
[1]Aki K.Asperities,Barriers,Characteristic Earthquake and Strong Motion Prediction[J].J Geophys Res,1984,89(B7):5867-5872.
    [2]Wiemer S,Wyss M.Mapping the Frequency-magnitude Distribution in Asperities:An Improved Technique to Calculate Recurrence Times?[J].J Geophys Res,1997,102(B7):15115-15128.
    [3]Wyss M,Schorlemmer D,Wiemer S.Mapping Asperities by Minima of Local Recurrence Time:San Jacinto-Elsinore Fault Zones[J].J Geophys Ras,2000,105(B4):7829-7844.
    [4]Scholz C H.The Frequency-magnitude Relation to Microfracturing in Rock and Its Relation to Earthquakes[J].Bull Seism Soc Am,1968,58:399-415.
    [5]Urbancic T I,Trifu C I,Long J M,et al.Space-time Correlation of b Value Spatial with Stress Release[J].Pure Appl Geophys,1992,139:449-462.
    [6]Mori J,Abercrombie R E.Depth Dependence of Earthquake Frequency-magnitude Distributions in California:Implications for the Rupture Initiation[J].J Geophys Res,1997,102:15081-15090.
    [7]黄永祥,谭承业.序列活动特性与岩石破裂强度的实验研究[J].地震研究,1982,5(3):324-331.HUANG Yong-xiang.An Experimental Study on the Features of the Sequence Activities and the Strength of the Rock Fracture[J].Journal of Seismological Researsh,1982,5(3):324-331.(in Chinese)
    [8]张智,吴开统,焦远碧.含有障碍体的岩石样品破裂发展过程中的b值变化[J].中国地震,1987,3(1):68-76.ZHANG Zhi,WU Kai-tong,JIAO Yuan-bi.The Changes of b Value on Samples Contained Barriers During Rupture Process[J].Earthquake Research in China,1987,3(1):68-76.(in Chinese)
    [9]朱红彬,邢成起,李红,等.华北构造区主要地震带分段与强震活动[J].地震学报,2010,32(6):705-717.ZHU Hong-bin,Xing Cheng-qi,LI Hong,et al.Segmentation of Main Seismicbelt Sand Strong Earthquakes in North China Tectonic Region[J].Acta Seismologica Sinica,32(6):705-717.(in Chinese)
    [10]李全林,陈锦标,于渌,等.b值时空扫描——监视破坏性地震孕育过程的一种手段[J].地球物理学报,1978,21(2):101-125.LI Quan-lin,CHEN Jin-biao,YU Lu,et al.Time and Space Scanning of the b-Value——a Method for Monitoring the Development of Catastrophic Earthquakes[J].Acta Geophysica Sinica,1978,21(2):101-125.(in Chinese)
    [11]易桂喜,闻学泽,徐锡伟.山西断陷带太原—临汾部分的强地震平均复发间隔与未来危险段落研究[J].地震学报,2004,26(4):387-395.YI Gui-xi,WEN Xue-ze,XU Xi-wei.Average Recurrence Intervals of Strong Earthquakes and Potential Risky Segments Along the Taiyuan—Linfen Portion of the Shanxi Graben System[J].Acta Seismologica Sinica,2004,26(4):387-395.(in Chinese)
    [12]易桂喜,闻学泽,范军,等.由地震活动参数分析安宁河—则木河断裂带的现今活动习性及地震危险性[J].地震学报,2004,26(3):294-303.YI Gui-xi,WEN Xue-ze,FAN Jun,et al.Assessing Current Faulting Behaviors and Seismic Risk of the an Ninghe—Zemuhe Fault Zone from Seismicity Parameters[J].Acta Seismologica Sinica,2004,26(3):294-303.(in Chinese)
    [13]易桂喜,闻学泽,张志伟,等.川南马边地区强震危险性分析[J].地震地质,2010,32(2):282-293.YI Gui-xi,WEN Xue-ze,ZHANG Zhi-Wei,et al.Study on Potential Strong Earthquake Risk in MaBian Area Southern SiChuan[J].Seismology and Geology,2010,32(2):282-293.(in Chinese)
    [14]Keilis-Borok V I,Knopoff L.Bursts of Aftershock of Strong Earthquakes[J].Nature,1980,283(P5744):259-263.
    [15]冯建刚,蒋长胜,韩立波,等.1970年以来甘肃台网地震观测报告收集整理及其重新定位研究[J].西北地震学报,2012,34(3):289-293.FENG Jian-gang,JIANG Chang-sheng,HAN Li-bo,et al.Collection and Research Work for the Earthquake Observation Report of the Gansu Seismographic Network Since 1970and Earthquake Relocation[J].Northwestern Seismological Journal,2012,34(3):289-293.(in Chinese)
    [16]冯建刚,蒋长胜,韩立波,等.甘肃测震台网监测能力及地震目录完整性分析[J].地震学报,2012,34(5):646-658.FENG Jian-gang,JIANG Chang-sheng,HAN Li-bo,et al.Analysis on the Monitoring Capability of Seismic Networks and Completeness of Earthquake Catalogues in Gansu Region[J].Acta Seismologica Sinica,2012,34(5):646-658.(in Chinese)
    [17]刘小凤,梅秀苹,冯建刚,等.青藏高原北部地区地震基本活动状态定量评价[J].西北地震学报,2011,33(2):130-136.LIU Xiao-feng,MEI Xiu-ping,FENG Jian-gang,et al.Quantitative Estimating Basic State of Seismicity in Northern Region of Qinghai—Xizang Plateau[J].Acta Seismologica Sinica,2011,33(2):130-136.(in Chinese)
    [18]苏鹤军,张慧,李晨桦,等.西秦岭北缘断裂带断层气浓度空间分布特征与强震危险性分析[J].地震工程学报,2013,35(3):671-676.SU He-jun,ZHANG Hui,LI Chen-hua,et al.Geochemical Features of Fault Gas on Northern Margin Fault of Xiqinling and Its Seismic Hazard Analysis[J].Northwestern Seismological Journal,2013,35(3):671-676.(in Chinese)
    [19]刘强,王爱国,邵延秀,等.甘肃古浪长岭山北麓断裂新活动特征与地震危险性[J].西北地震学报,2011,33(2):123-129.LIU Qiang,WANG Ai-guo,SHAO Yan-xiu,et al.Active Characteristics and Seismic Risk of Northern Piedmont Fault of Changling Mountain in Gulang County,Gansu Province[J].Northwestern Seismological Journal,2011,33(2):123-129.(in Chinese)
    [20]王熠熙,张辉.利用多个震源机制解求祁连山西段平均应力场方向[J].地震工程学报,2013,35(2):289-295.WANG Yi-xi,ZHANG Hui.Determination of the Direction of the Mean Stress Field in the Western Qilian Mountains through Focal Mechanism Solution Analysis[J].Northwestern Seismological Journal,2013,35(2):289-295.(in Chinese)
    [21]韩晓明,薛丁,赵星.内蒙古东部扎兰屯地区的b值时空变化特征[J].地震,2012,32(3):142-149.HAN Xiao-ming,XUE Ding,ZHAO Xing.Spatio-temporal bvalue Variation Characteristics in the Zhalantun Area of the Eastern Part of Inner Mongolia[J].Earthquake,2012,32(3):142-149.(in Chinese)
    [22]王辉,曹建玲,申旭辉.华北地区的背景地震活动及区域未来强震危险性[J].地震,2011,31(2):11-23.WANG Hui,CAO Jian-ling,SHEN Xu-hui.Background Seismicity and Its Application to Seismic Hazard Assessment in the North China Region[J].Earthquake,2011,31(2):11-23.(in Chinese)
    [23]王玉婷,吕悦军,谢卓娟,等.河北平原地震带的现今活动性分析[J].地震地磁观测与研究,2012,33(2):6-14.WANG Yu-ting,LV Yue-jun,XIE Zhuo-juan,et al.Modern Activity Characteristics of the Hebei Plain Seismic Belt Based on Seismic Activity Parameter Analysis[J].Seismological and Geomagnetic Observation and Research,2012,33(2):6-14.(in Chinese)
    [24]陈凌,刘杰,陈颙,等.地震活动性分析中余震的删除[J].地球物理学报,1998,41:244-252.CHEN Ling,LIU Jie,CHEN Yong,et al.Aftershock Deletion in Seismicity Analysis[J].Acta Geophysica Sinica,1998,41:244-252.(in Chinese)
    [25]易桂喜,闻学泽.多地震活动性参数在断裂带现今活动习性与地震危险性评价中的应用与问题[J].地震地质,2007,29(2):254-271.YI Gui-xi,WEN Xue-ze.The Application and Limitation of Mulyiple Seismicity Parameters to Assessing Current Faulting Behavior and Seismic Potential of Active Fault Zones[J].Seismology and Geology,2007,29(2):254-271.(in Chinese)
    [26]张恩立,陈德兴,李昊,等.由地震活动参数分析安徽省新生代构造变形带现今活动习性与地震危险性[J].华南地震,29(2):55-61.ZHANG Enli,CHEN De-xing,LI Hao,et al.Analysis of Current Seismic Activity Features and Seismic Risk of Anhui Cenozoic Tectonic Deformation Zones Based on Seismic Activity Parameters[J].South China Journal of Seismology,29(2):55-61.(in Chinese)
    [27]武敏捷,朱红彬,岳晓媛,等.基于多地震活动参数的首都圈地区地震危险性分析[J].华北地震科学,31(1):25-30.WU Min-jie,ZHU Hong-bin,YUE Xiao-yuan,et al.Analysis on Potential Earthquake Risk of Capital Zone Based on Multiple Seismicity Parameters[J].North China Earthquake Sciences,31(1):25-30.(in Chinese)

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