地震研究

利用Atkinson方法结合福建数字地震台网28个数字地震台记录的70个地震事件波形资料,对福建地区的非弹性衰减系数进行研究,得出福建地区介质平均Q值与频率f的关系式。利用Moya方法分别计算了福建台网“九五”和“十五”系统的台站场地响应,共获得37个地震台站的场地响应。最后根据Brune模型计算了2000年1月1日至2011年9月30日福建台网记录的省内及临近海域M_L2.5以上157次地震的震源参数,这些地震M_L震级与地震矩M₀在单对数坐标下成线性关系,与震源尺度及应力降没有明显相关性。

Firstly,using 70 seismic events waveform recorded by 28 digital seismic stations in Fujian digital seismic network,we calculated the inelastic attenuation coefficient by Atkinson's method and obtained the relationship between average Q-value and frequency in Fujian region.Secondly,we calculated site responses of stations in the “Ninth Five-years” and “Tenth Five-years” plans respectively in Fujian digital seismic network by Moya Method,and obtained site responses of 37 stations.Finally,according to Brune model,we calculated the source parameters of 157 M_L≥2.5 earthquakes which is recorded by Fujian digital seismic network occurred in Fujian and its adjacent sea area from Jan.1,2000 to Sep.3,2011.There was a linear relationship between M_L of these earthquakes and seismic moment M₀ in the single-logarithmic coordinates,but there wasn't evident correlation between M_L and source scale,stress drop.

引言
1 资料选取与预处理
2 计算方法和结果
3 结论与讨论

图1 计算Q值和场地响应所选用地震的<br/>震中和射线分布图<br/>Fig.1 Epicenters of earthquakes which are selected to calculate Q-value and site response and ray distribution

图1 计算Q值和场地响应所选用地震的
震中和射线分布图
Fig.1 Epicenters of earthquakes which are selected to calculate Q-value and site response and ray distribution

图2 福建地区介质品质因子与频率的关系<br/>Fig.2 Relationship between Q-value and frequency in Fujian area

图2 福建地区介质品质因子与频率的关系
Fig.2 Relationship between Q-value and frequency in Fujian area

图3 福建地震台网台站场地响应平均值<br/>(红线为采用“九五”系统记录的数据进行计算的结果,蓝线为采用“十五”系统记录的数据<br/>进行计算的结果,台站代码为“十五”使用代码,括号内代码为“九五”系统使用代码)<br/>Fig.3 Average site response of the stations in Fujian seismic network (Red line is the average site response of stations in Ninth Five-year Plan,blue line is the average site response of stations in Tenth Five-year Plan,the station codes represent the Tenth Five-year Plan stations,while the stations code of Ninth Five-year Plan are in brackets)

图3 福建地震台网台站场地响应平均值
(红线为采用“九五”系统记录的数据进行计算的结果,蓝线为采用“十五”系统记录的数据
进行计算的结果,台站代码为“十五”使用代码,括号内代码为“九五”系统使用代码)
Fig.3 Average site response of the stations in Fujian seismic network (Red line is the average site response of stations in Ninth Five-year Plan,blue line is the average site response of stations in Tenth Five-year Plan,the station codes represent the Tenth Five-year Plan stations,while the stations code of Ninth Five-year Plan are in brackets)

图4 地震矩、震源半径、应力降与震级ML关系图<br/>Fig.4 Relationship between seismic moment,seismic source radius,stress drop and magnitude ML

图4 地震矩、震源半径、应力降与震级ML关系图
Fig.4 Relationship between seismic moment,seismic source radius,stress drop and magnitude ML

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备注

引言

1 资料选取与预处理

2 计算方法和结果

3 结论与讨论

期刊信息