青海地区中强地震震源过程的宽频带资料分析

１９８８年至１９９０年，青海地区发生了４次震级大于６．０的地震，本文利用全球数字地震台网（ＧＤＳＮ）的宽频带波形资料，通过波形模拟，结合地质结造的背影资料对这几个地震的震源破裂和发震构造背景进行了研究。通过台站的视震源时间函数（ａＳＴＦ）和视时间差（ａＴＤ）的分析，特别对震源的复杂性进行了讨论。本文的研究从震源分析的角度进一步支持了青藏高原东北部构造应力的压力轴为接的水平的ＮＥ方向，而随着向青藏高

Analysis on Source Process of Strong Earthquakes in Qinghai Province of China from Broadband Data

Four earthquakes larger than M S 6 0 occurred in Qinghai Province of China from 1988 to 1990.Using broadband data from GDSN,the source ruptures of these earthquakes and tectonic surroundings were studied by waveform modelling combining with geological tectonic and background data.By analysis of apparent source time function (aSTF) and apparent source difference (aTD),especially about complexity of sources,in the view of source analysis,the result supports further the conclusions that the compressive stress axis of tectonic stress at northeastern Qinghai Xizang (Tibetan) plateau is at NE direction approximate to horizontal,and it counterclockwisely turns to be at NEE or N to S direction approximate to horizontal with the orientation to northern Qinghai Xizang plateau.