摘要
本文利用中国数字化地震台网(CDSN)记录到的长周期面波资料,测定了黄海的瑞利波 Q 值。在周期为20秒—170秒范围,黄海的瑞利波 Q 值在52—223。采用随机逆反演方法反演出其地壳与上地幔的 Q_β结构。结果表明:黄海的地壳平均 Q_β值为216左右,在上地幔存在一个厚约30km 的强衰减层(低 Q 值层),该层的顶部埋深距地表约为50km。与华北地区的上地幔低速层位置相似,证实了黄海是中朝地台的一部分之说。
In this article, by using the data of long period surface-wave of CDSN,the
authors have determinated the Q value from Raylergh wave under the Huanghai
Sea.In the range of period from 20 seconds to 170 seconds,the Q value of Ray-
lergh wave under the Huanghai Sea varies from 52 to 223. By using the stochastic
inversion method. The authors have also obtained the Q_β structure of the crust
and upper mantle under Huanghai Sea. The conclusion shows that the average
Q_β value of Huanghai crust is about 216, there is a layer of great attenuation
(low Q_β value layer), whose top lies 50 kilometers below the earth surface, that
is similar to the case of the low velocity layer of the upper mantle of the Hua-
bei zone. This verifies the hypothesis that Huanghai is a part of the China-Korea
platform.
出处
《地震地磁观测与研究》
1992年第3期24-30,共7页
Seismological and Geomagnetic Observation and Research
基金
本课题得到地震学联合基金会的部分资助
关键词
黄海
地壳
上地幔
Qβ结构
Surface-wave
Attenuation
Q_β structure
Huanghai
