摘要
不同构造单元的地震测深资料Pm波形的复杂性有明显的差异,这种差异与深部构造特征有密切的联系。利用波的瞬时特性和波列长度,给出一种地震波形复杂性系数的计算方法。古老稳定的地块的Moho复杂性系数小,反映一级间断面的特征;反之对于活动性强烈地块,Moho复杂性系数大,反映壳幔过渡带的特征。处理了穿过青藏高原东北缘的一条地震测深剖面,并对结果进行了动力学意义的解释。
Obvious differences exist in the complexity of Pm waves obtained by deep seismic sounding (DSS) in different tectonic units. These differences are closely related to deep structural features. In this paper, a method is proposed for computing the complexity of seismic waves on the basis of its transient features and duration. For an ancient stable block, the Moho complexity coefficient is small, which reflects the feature of first order discontinuous interface. In contrast, for a strongly active block, the Moho complexity coefficient is large, which reflects the feature of crust-mantle transitional zone. Data processing was carried out with respect to a DSS profile which passes through the northeastern edge of Qinghai-Xizang Plateau. The result was interpreted dynamically.
出处
《物探与化探》
CAS
CSCD
2005年第2期111-115,共5页
Geophysical and Geochemical Exploration
基金
地震科学联合基金(104027
102025)资助
关键词
壳幔过渡带
Pm波形
复杂性系数
动力学意义
crust-mantle transitional zone
Pm wave
complexity coefficient
dynamic implications
