| Comparison and analysis of the stress field in the source region of Tangshan and Lancang earthquake sequences |
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| 引用本文： | 刁桂苓,于利民,李钦祖.Comparison and analysis of the stress field in the source region of Tangshan and Lancang earthquake sequences[J].地震学报(英文版),1995,8(3):379-386. |
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| 作者姓名： | 刁桂苓 于利民 李钦祖 |
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| 作者单位： | Gui-Ling DIAO;Li-Min YU; Qin-Zu LI and Shao-JinWANG(Seismological Bureau of Tianjin，Tianjin 300201，China)(Seismological Bureau of Hebei Province，Shijazuang 050021，China)(Seismological Bureau of Yunnan Province，Kunming 650041，China) |
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| 摘 要： | ＣｏｍｐａｒｉｓｏｎａｎｄａｎａｌｙｓｉｓｏｆｔｈｅｓｔｒｅｓｓｆｉｅｌｄｉｎｔｈｅｓｏｕｒｃｅｒｅｇｉｏｎｏｆＴａｎｇｓｈａｎａｎｄＬａｎｃａｎｇｅａｒｔｈｑｕａｋｅｓｅｑｕｅｎｃｅｓＧｕｉ－ＬｉｎｇＤＩＡＯ；（刁桂苓）Ｌｉ－ＭｉｎＹＵ；（于利民）...
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| 收稿时间： | 23 February 1994 |
| 修稿时间： | 29 August 1994 |
Comparison and analysis of the stress field in the source region of Tangshan and Lancang earthquake sequences |
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| Gui-Ling Diao, Li-Min Yu, Qin-Zu Li and Shao-Jin Wang.Comparison and analysis of the stress field in the source region of Tangshan and Lancang earthquake sequences[J].Acta Seismologica Sinica(English Edition),1995,8(3):379-386. |
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| Authors: | Gui-Ling Diao Li-Min Yu Qin-Zu Li and Shao-Jin Wang |
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| Institution: | (1) Seismological Bureau of Tianjin, 300201 Tianjin, China;(2) Seismological Bureau of Hebei Province, 050021 Shijiazhuang, China;(3) Seismological Bureau of Yunnan Province, 650041 Kunming, China |
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| Abstract: | The state of the stress fields in the source region is analysed systematically, on the basis of the focal mechanisms of 167
events withM
s⩾4.0 of Tangshan sequence and 163 moderate-small events of Lancang sequence respectively. The result indicates that the directions
of the stress field in the source region are generally stable and the variation is not obvious after the occurrence of strong
shock. The dominant orientations of focal mechanisms of the aftershocks are consistent with that of the mainshock, there is
still a small difference between some mechanisms of aftershocks and the mechanism of mainshock, and the difference decreases
as time goes on. The numbers of solutions with dominant direction of Tangshan and Lancang sequences are similar to each other,
it indicates that the controls of the strong earthquake sequences from the tectonic stress field are similar to each other
too. Through the hierarchical clustering analysis of focal mechanism, it is found that the number of clusters of Tangshan
sequence is larger than that of Lancang sequence, and their orientations are relatively disordered. It may be the cause that
the tectonics in the Tangshan region are more complicated than those in the Lancang region. |
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| Keywords: | focal mechanism stress field Tangshan earthquake sequence Lancang earthquake sequence |
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