三维复杂速度结构中深发地震的双差分定位

江国明; 赵大鹏; 张贵宾

Volume 34 Issue 6

Jun. 2009

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JIANG Guo-ming, ZHAO Da-peng, ZHANG Gui-bin, 2009. Locating Deep Earthquakes in Complex 3-D Velocity Structure Using a Modified Double-Difference Location Method. Earth Science, 34(6): 1001-1011.

Citation:

JIANG Guo-ming, ZHAO Da-peng, ZHANG Gui-bin, 2009. Locating Deep Earthquakes in Complex 3-D Velocity Structure Using a Modified Double-Difference Location Method. Earth Science, 34(6): 1001-1011.

JIANG Guo-ming, ZHAO Da-peng, ZHANG Gui-bin, 2009. Locating Deep Earthquakes in Complex 3-D Velocity Structure Using a Modified Double-Difference Location Method. Earth Science, 34(6): 1001-1011.

Citation:

JIANG Guo-ming, ZHAO Da-peng, ZHANG Gui-bin, 2009. Locating Deep Earthquakes in Complex 3-D Velocity Structure Using a Modified Double-Difference Location Method. Earth Science, 34(6): 1001-1011.

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Locating Deep Earthquakes in Complex 3-D Velocity Structure Using a Modified Double-Difference Location Method

1.
Key Laboratory of Geo-Detection of Ministry of Education, China University of Geosciences, Beijing 100083, China
2.
School of Geophysics and Information Technology, China University of Geosciences, Beijing 100083, China
3.
Department of Geophysics, Tohoku University, Sendai 980-8578, Japan

Received Date: 2009-06-10
Publish Date: 2009-11-25

Abstract

Abstract

The double-difference (DD) earthquake location algorithm cannot be used to locate earthquakes in the complex 3-D velocity models because it adopts a 1-D ray tracing technique and the Cartesian coordinates. In this study, we have improved the DD location method by adopting a 3-D ray tracing method and the spherical coordinates, and thus extended the range of its applications. To testify the feasibility and the precision of this new method, we have relocated the deep earthquakes that occurred beneath the Japan Sea, and analyzed the effect of velocity models by comparing the relocation results in four kinds of 3-D velocity models. Our results show that the improved DD location method is less affected by the velocity model, and the closer the velocity structure in the hypocenter to the real one is, the higher the location precision is. The improved DD location technique would be very useful for studying the mantle structure by using data from deep earthquakes.
- earthquakes,
- double-difference location,
- 3-D velocity model,
- Japan Sea

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References(34)

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