北部湾地震的震源机制及地震地质条件
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摘要
对北部湾地震的震源机制解和地震地质条件进行了详细分析，认为靖西－崇左断裂带过震中的北北西向断层为发震断裂；四会－吴川断裂带过震中的北东东向断层为控震构造。震源构造应力场的主压应力方向为北西－南东向，发震断层的活动方式既有垂直差异运动又有走滑运动。
The focal mechanism solution and seismic geologic conditions of the Beibuwan earthquakes are discussed.The fault which belongs to Jingxi-Chongzuo fault zone in NW-SE direction and crosses the epicenter is the seismogenic fault.The fault which belongs to Sihui-Wuchuan fault zone in NE-SW direction and crosses the epicenter must have some effects on this seismic sequence.The main pressure direction of the focal stress field is in NW-SE direction.The Beibuwan basin and the fault in and around it inherit the past active model still now.
The focal mechanism solution and seismic geologic conditions of the Beibuwan earthquakes are discussed.The fault which belongs to Jingxi-Chongzuo fault zone in NW-SE direction and crosses the epicenter is the seismogenic fault.The fault which belongs to Sihui-Wuchuan fault zone in NE-SW direction and crosses the epicenter must have some effects on this seismic sequence.The main pressure direction of the focal stress field is in NW-SE direction.The Beibuwan basin and the fault in and around it inherit the past active model still now.
引文
1张虎男，等华南沿海新构造运动与地质环境．北京：地震出版社，1990．2陈宽陆．乌石－那陈地区的石油地质及其勘探方向．南海石油，1995，12（1）：1～93广西壮族自治区地方志编纂委员会．广西通志－地震志．南宁：广西人民出版社，1990．4吴时平，等．北部湾6．1、6．2级地震序列特征．华南地震，1996，16（3）：58～635刘以宣，等．南海北部陆缘地震带基本特征及区域稳定性初步分析．华南地震，1994，14（4）：41～45
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