Earth Planets Space, Vol. 58 (No. 2), pp. e9-e12, 2006E-LETTER
Ling Bai1, Zhongliang Wu2, Tianzhong Zhang2, and Ichiro Kawasaki1
1Disaster Prevention Research Institute, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
2Institute of Geophysics, China Earthquake Administration, Beijing 100081, China
(Received October 13, 2005; Revised January 23, 2006; Accepted January 30, 2006; Online published February 10, 2006)
In this letter, we investigate the effect of station distribution (including the number and azimuthal gap of stations) upon location error based on the field data observed at Northern California Seismic Network (NCSN) using a double-difference earthquake location algorithm and a bootstrap method. The earthquakes relocated by all 117 stations are set as reference and the error of location is defined as the RMS of the difference to the reference. We find that the location error has a nonlinear relationship with the distribution of stations. The results may be used as guidelines for building seismic network.
Key words: Number of stations, azimuthal gap of stations, location error, double-difference earthquake location algorithm, bootstrap method.