三维复杂速度结构中深发地震双差分定位.pdfVIP

34 6 V ol. 34 N o . 6 2 0 0 9 1 1 Earth Science Jo ur nal of China U niver sity o f Geosciences N ov. 2 0 0 9 1, 2 3 2 江国明 , 赵大鹏, 张贵宾 1. 中国地质大学地下信息探测技术与仪器教育部重点实验室, 北京 100083 2. 中国地质大学地球物理与信息技术学院, 北京 100083 3. 日 东北大学地球物理系, 仙台 980- 8578 , . , . , , 4 , . , , , , . ; ; ; . P 631 1000 - 2 383( 2009) 0 6- 1001- 11 2009- 0 6- 10 Locating Deep Earthquakes in Complex 3-D Velocity Structure Using a Modified Dou le-Difference Location Method 1, 2 3 2 J IA N G Guo- ming , ZH A O D a- peng , ZH A N G Gu-i bin 1. K ey L abor atory of Ge o-D et ect ion of M i nistr y of Ed ucat ion, Chi na Univ er s ity of Geosciences , B eij i ng 100083, Chi na 2. S choo of Ge op hy sics and I nf ormat ion Te chno ogy , Chi na Univ er s ity of Geosciences , B eij i ng 100083, Chi na 3. D ep ar tment of Geop hys ics, T oh ok u Unive rs i ty , S endai 980- 8578, J ap an A stract: T he do uble- diff er ence ( D D) earthqu ake location alg or ithm cannot be u sed to locate eart hquakes in t he complex 3- D velo city models becau se it ado pt s a 1- D r ay tracing techniqu e and the Cartesian co or dinates . In this st udy, w e h ave impro ved the DD lo cation m ethod by ado pt ing a 3- D r ay tracing m et ho d and the spherical co or dinates, and thu s ex tended the rang e o f it s a p- plication s . T o t estify the f easibility and the precision of this new m etho d, w e h av e r elocated t he deep earthqu akes th at occur red beneath the J ap an Sea, and ana