昆明地震台网多事件定位问题的初步研究
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摘要: 根据昆明电信传输台网1983-1989年记录的区域地震初至 P 波走时资料,用参数分离和多事件定位的方法得到台网内各台站的 P 波走时校正值.这组校正值在一定程度上反映了该地区地壳上部横向不均匀结构的特征.台站校正值的地理分布明显地分为3个地区:台站最密集的滇西地区,所有台站(不包括南边的云县,施甸和畹町)的台站校正值不超过0.15s;东部地区(楚雄以东)台站分布仍较密集,但间距比滇西大,其中大部分台站显示为正延迟;南部地区包括文山、思茅、普洱以及云县、施甸和畹町,它们均显示出较大的负延迟.这与云南地区的地质构造特征基本上是一致的.走时校正后重新定位的精度有较大的提高,因此,这组台站校正值可以提供地震台网的常规定位使用.
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[12] Yan, Q.,Zhang, G.,Kan, R. and Hu, H.,1985. The crustal structure of Simao to Malong profile. Yunnan Province, china.J. Seism.Res.,8, 249——280.[1] 胡鸿翔、陆涵行、王椿铺、何正勤、朱良保、颜其中、樊跃新、张国庆、邓英娥,1986.滇西地区地壳结构的爆破地震研究. 地球物理学报,29,133——144.
[2] Chatelain, J. I.,Roecker, S. W.,Hatzfeld, D. and Molnar, P.,1980. Microearthquake seismicity and fault plane solutions in the Hindu Kush region and their tectonic implications. J. GPophys. ReS.,85.1365——1387.
[3] Dewey, J. W.,1972. Seismicity and tectonics of western Venezuela. Bull. Seismol. Soc. Amer.,62,1711——1751.
[4] Douglas, A.,1967. Joint epicentre determination. Nature,215,47——48.
[5] Frohlich, C.,1979. An efficient method for joint hypocenter determination for large groups of earthquake. Comput. Geosci.,5, 387——389.
[6] Geiger, I.,1912. Probability method for the determination of earthquake epicenter from the arrival time only. Bull. St. Louis Univ.,8, 60——71.
[7] Lawson, C. H. and Hanson, R. J.,1974. Soloing Least Squares Problems. 260——267, 295——300. Prentice——Hall. En——glewood Cliffs, New Jersey.
[8] Pavlis, (}. I.and Booker, J. R.,1983. Progressive multiple event location (PMEI).Bull. Seisnwl. Soc. Am"r.,
[9] 73, 1753——1777.
[10] Pavlis, G. L.and Hokanson, N. B.,1985. Separated earthquake location. J. Geophys. RPS.,90, 12777——12789.
[11] Wiggins, R. A,1972. The general linear inverse problem: implications of surface waves and free oscillations for earth structure. Rev. GeophyS. Spare Phys. 10. 251——285.
[12] Yan, Q.,Zhang, G.,Kan, R. and Hu, H.,1985. The crustal structure of Simao to Malong profile. Yunnan Province, china.J. Seism.Res.,8, 249——280.
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