青藏高原北部地区地震基本活动状态定量评价
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摘要
基于区域构造背景、应力场状态及动力学环境等,将青藏高原北部地区划分为4个相对独立的统计单元,即祁连山地震带、甘东南地区、柴达木-共和地块及库玛地震带。通过地震频度和b值拟合确定了各个地区不同下限震级的地震目录完整性起始时间;确定了各构造单元中强以上地震活跃与平静交替活动的特征;定量计算了在平均状态中强以上地震活动特征参数及平静阶段与活跃阶段地震活动特征参数;分别获得了各个区域在平均、活跃与平静状态下的小震活动状态参数。
The northern region of Qinghai-Xizang plateau is divided into four separated seismicity areas according to the regional geological structures,stress field and dynamic environment,they are Qilian mountain seismic belt,southeastern Gansu province,Caidam-Gonghe block and Kuma seismic belt.The starting times for the minimum earthquake magnitude with complete recording catalogue in every areas are confirmed on the base of b-value and seismic frequency.The alternative characteristics of active and calm periods for moderate-strong earthquakes in each area are concluded.Finally,the quantitatively characteristic parameters of earthquakes activity which have magnitudes bigger than moderate-strong event in average,active and calm periods are calculated separately,and also the state parameters of small event activity in three periods are obtained for the four areas.
The northern region of Qinghai-Xizang plateau is divided into four separated seismicity areas according to the regional geological structures,stress field and dynamic environment,they are Qilian mountain seismic belt,southeastern Gansu province,Caidam-Gonghe block and Kuma seismic belt.The starting times for the minimum earthquake magnitude with complete recording catalogue in every areas are confirmed on the base of b-value and seismic frequency.The alternative characteristics of active and calm periods for moderate-strong earthquakes in each area are concluded.Finally,the quantitatively characteristic parameters of earthquakes activity which have magnitudes bigger than moderate-strong event in average,active and calm periods are calculated separately,and also the state parameters of small event activity in three periods are obtained for the four areas.
引文
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[2]刘百篪,曹娟娟,袁道阳,等.青藏高原北部活动地块内部的活断层定量资料[J].地震地质,2008,30(1):161-175.
[3]张希,张晓亮,王双绪,等.青藏块体东北缘近期地壳水平运动与应变积累[J].大地测量与地球动力学,2008,28(4):12-16.
[4]刘小凤,刘百篪,杨立明.祁连山中东段三维构造物理模型及其在地震预报中的应用[J].西北地震学报,2000,22(2):-.
[5]王海涛,李莹甄,屠弘伟.新疆历史地震目录完整性分析[J].内陆地震,2006,20(1):10-17.
[6]Gutenberg B,Richter C F.Earthquake magnitude,intensity,energy and acceleration[J].Bull.Seism.Soc.Am.,1956,46:105-143.
[7]Richter C F.Elementary seismology[M].San Francisco:Free-man,1958.
[8]冯建刚,姚家骏,代炜.青藏高原北部地区小震目录完整性分析[J].高原地震,2010,22(2):10-14.
[9]杨立明,肖丽珠,张小美,等.青藏高原北部地震活动形势及其与中国大陆地区地震活动的关系研究[J].地震,2001,23(3):243-249.
[10]蒋海昆,吴琼,董祥,等.不同温压条件下声发射应变能释放特征——加速模型参数物理含义的初步讨论[J].地球物理学报,2009,52(8):2064-2073.
[11]蒋海昆,董祥,苗青壮,等.中国大陆7级强震前中小地震应变释放特征[J].地震,2009,29(3):1-10.
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