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矩张量反演法在江苏及附近海域的应用
The preliminary application research of moment tensor inversion in Jiangsu and its adjacent sea areas
- DOI:
- 作者:
- 康清清1)，顾勤平1)?，刘红桂1,2,3)，缪发军1
- 作者单位:
- 1）江苏南京 210014 江苏省地震局 2）中国北京 100081 中国地震局地球物理研究所 3）中国北京 100036 中国地震局地震预测研究所
- 关键词:
- 矩张量反演；震源机制解；中小地震；时间域；Pnl波；江苏及附近海域；区域地震台网
moment tensor inversion；focal mechanism solution；small-moderate size earthquakes；Pnl wave；Jiangsu and its adjacent sea areas；regional seismic network
- 摘要:
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本文利用江苏区域数字地震台网宽频带地震计记录的Pnl波波形资料，采用TDMT_INV时间域地震矩张量反演方法，尝试反演了2009～2011在江苏和附近海域共7次中小地震（ML3.5以上，最大震级为ML5.3）的地震矩张量解，并通过记录清晰的P波初动在震源球的下半球投影对反演结果进行了评价。结果表明：反演结果与初动方向一致较好。由此说明了在研究区域内用矩张量反演法测定中小地震震源机制解具有一定的可行性。
The moment tensor solutions of 7 moderate and small size earthquakes（3.5 ML 5.3）which occurred in Jiangsu and itsadjacent sea areas from 2009 to 2011 were determined in time domain by using the Pnl waveforms recorded by regional broadband seismometers，based on the method of moment tensor inversion（TDMT_INV）．The inversion results were evaluated by the P- wave fist motions projected on a lower-hemisphere stereographic focal sphere．The results reveal that the P-wave fist motions are quite coincident with the inversion results．Therefore，it is practicable to determine focal mechanism in Jiangsu and its adjacent sea areas by using the method of moment inversion．
