摘要
１９８８年至１９９０年，青海地区发生了４次震级大于６０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，结合地质构造的背景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近水平的ＮＥ方向，而随着向青藏高原北部的推移其构造应力的压力轴逆时针变为接近水平的ＮＥＥ或ＮＳ方向的结论。
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.
出处
《中国地震》
CSCD
北大核心
1998年第1期14-20,共7页
Earthquake Research in China
基金
地震科学联合基金
国家地震局分析预报中心青年基金
关键词
青藏高原
震源过程
宽频带数据
中强地震
Qinghai Xizang (Tibetan) plateau,Source process,Rupture,Apparent source time function (aSTF),Apparent source difference (aTD)
