广东阳江地震序列双差法重新定位结果分析
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摘要
利用双差定位法对阳江地区2004年1月—2007年5月ML≥1.5地震记录重新进行定位,结果显示,2004年9月17日阳江平冈4.9级地震前,阳江地区出现了北北西向及北西向两条ML≥2.0地震条带,其中北北西向条带与4.9级地震的震源机制解节面Ⅱ及断层破裂方位角方向一致,且在震前1月北北西向条带上的地震出现震源深度加深现象,4.9级地震发生在条带的东南端。
The Yangjiang earthquake sequences from January,2004 to May,2007 were relocated with the double-difference location algorithm.The results show that two ML≥2.0 seismicity belts distributed in Yangjiang area before Yangjiang M4.9 earthquake occurred on 17th September,2004,the direction of one belt was NNW and the other was NW.The direction of NNW ML≥2.0 seismicity belt was consistent with the direction of nodal plane Ⅱ of focal mechanism and the focal rupture azimuth.The focal depth of NNW seismicity belt deepened gradually in one month before the M4.9 earthquake and it occurred at the southeast edge of NNW seismicity belt.
The Yangjiang earthquake sequences from January,2004 to May,2007 were relocated with the double-difference location algorithm.The results show that two ML≥2.0 seismicity belts distributed in Yangjiang area before Yangjiang M4.9 earthquake occurred on 17th September,2004,the direction of one belt was NNW and the other was NW.The direction of NNW ML≥2.0 seismicity belt was consistent with the direction of nodal plane Ⅱ of focal mechanism and the focal rupture azimuth.The focal depth of NNW seismicity belt deepened gradually in one month before the M4.9 earthquake and it occurred at the southeast edge of NNW seismicity belt.
引文
1 Spence W.Relative epicenter determination using P-wavearrival-time difference[J].Bull.Seism.Soc.Amer.,1980,89:822-828.
2 Waldhauser F and Ellaworth W L.A double-differenceearthquake location algorithm:Method and application to theNorthern Hayward fault,California[J].Bull.Seism.Soc.Amer.,2000,90(6):1 353-1 368.
3张爱民,李强.双差定位法在三峡库区地震定位中的应用[J].大地测量与地球动力学,2006(3):73-77.
4 Wolfe C J.On the mathematics of using difference operationsto relocate earthquakes[J].Bull.Seism.Soc.Amer.,2003,93:1 875-1 889.
5郑圻森,等.华南地区地壳速度结构分析[J].沉积与特提斯地质,2003,23(12):9-13.
6郑圻森,等.华南地区岩石圈地壳速度结构数据处理[J].物探化探计算技术,2004,26(2):97-100.
7江西省地质矿产局.江西省区域地质志[M].北京:地质出版社,1984.
8闻则刚,等.广东省东部地区的S波速度结构[J].西北地震学报,2005,27(2):154-157.
9姚伯初,等.中美合作调研南海地质专报GMSCS[M].武汉:中国地质大学出版社,1994.
10秦乃刚,刘特培.2004年9月17日阳江4.9级地震序列的一些特征[J].华南地震,2005,25(4):34-41.
11叶秀薇,等.2004年阳江4.9级地震破裂方位角研究[J].大地测量与地球动力学,2006(4):102-106.
2 Waldhauser F and Ellaworth W L.A double-differenceearthquake location algorithm:Method and application to theNorthern Hayward fault,California[J].Bull.Seism.Soc.Amer.,2000,90(6):1 353-1 368.
3张爱民,李强.双差定位法在三峡库区地震定位中的应用[J].大地测量与地球动力学,2006(3):73-77.
4 Wolfe C J.On the mathematics of using difference operationsto relocate earthquakes[J].Bull.Seism.Soc.Amer.,2003,93:1 875-1 889.
5郑圻森,等.华南地区地壳速度结构分析[J].沉积与特提斯地质,2003,23(12):9-13.
6郑圻森,等.华南地区岩石圈地壳速度结构数据处理[J].物探化探计算技术,2004,26(2):97-100.
7江西省地质矿产局.江西省区域地质志[M].北京:地质出版社,1984.
8闻则刚,等.广东省东部地区的S波速度结构[J].西北地震学报,2005,27(2):154-157.
9姚伯初,等.中美合作调研南海地质专报GMSCS[M].武汉:中国地质大学出版社,1994.
10秦乃刚,刘特培.2004年9月17日阳江4.9级地震序列的一些特征[J].华南地震,2005,25(4):34-41.
11叶秀薇,等.2004年阳江4.9级地震破裂方位角研究[J].大地测量与地球动力学,2006(4):102-106.
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