Preliminary Discussion on the Implication of Determination of Source Depth of Earthquakes

In an earthquake catalog,the source depth of earthquakes is one of the most basic parameters; however it is also one of the most difficult to measure.The source depths in the PDE bulletin,the centroid depths from CMT inversion of USGS and Harvard University,and those obtained by depth phases of broadband waveform data are not equal to each other,and they are also have different meanings.Also,the depth obtained from broadband waveform modeling is another kind of depth of different a rupture "core." This paper preliminarily discusses the physical implication of the source depth of earthquakes with different measuring methods.

测定震源深度的意义的初步讨论

在地震目录中，震源深度是地震学最基本的参数之一，然而它也是一个最不易测准的参数。ＰＤＥ报告中的震源深度以及ＵＳＧＳ和Ｈａｒｖａｒｄ大学的ＣＭＴ反演的矩心深度和利用宽频带波形的深度震相资料获得的震源深度各不相同，其含义也不同，而宽频带波形模拟得到又是另一种破裂“核心”的深度。本文对不同测量手段的震源深度的不同物理意义做了初步的讨论。

不同意义下的震源深度

通过对1993年6月发生在环太平洋地震带上几个5．7级以上地震的分析，利用震中初始确定（PDE）资料及全球数字地震台网（GDSN）宽频带资料，对震源深度进行了初步讨论。