Catalog is relocated using 3D velocity model references as follows,
Wu, Y. M., C. H. Chang, L. Zhao, T. L. Teng and M. Nakamura (2008). A Comprehensive Relocation of Earthquakes in Taiwan from 1991 to 2005, Bull. Seism. Soc. Am., 98, 1471¡V1481, doi: 10.1785/0120070166.
Wu, Y. M., C. H. Chang, L. Zhao, J. B. H. Shyu, Y. G. Chen, K. Sieh, and J. P. Avouac (2007). Seismic tomography of Taiwan: Improved constraints from a dense network of strong-motion stations. J. Geophys. Res., 112, B08312, doi: 10.1029/2007JB004983.
Wu, Y. M., J. B. H. Shyu*, C. H. Chang, L. Zhao, M. Nakamura, and S. K. Hsu (2009). Improved seismic tomography offshore northeastern Taiwan: Implications for subduction and collision processes between Taiwan and the southernmost Ryukyu, Geophys. J. Int. 178, 1042¡V1054, doi: 10.1111/j.1365-246X.2009.04180.x.
Data format:
The data sequence are aligned as:
year(I4), month(I2), day(I2),hour(I2), minute(I2), second(F6.2),
north_latitude(I2), minute(F5.2),east_longitude(I3), minute(F5.2), depth(F6.2),
magnitude(F4.2), station number(I2),
epicentral distance to the nearest station(F5.1), gap(I3),
RMS(F4.2), ERH(F4.1), ERZ(F4.1), focal depth control(F: free run,
X:fixed depth), number of phases picked(I3), quality(A1), correlated phase file name,
errors in Longitude, Latitude, and depth determined by Wu et al. (2013)
Wu, Y. M., C. H. Chang, H. Kuo-Chen, H. H. Hunag, and C. Y. Wang (2013).
On the use of explosion records for examining earthquake location uncertainty in Taiwan,
Terr. Atmos. Ocean. Sci., 24, 685-694, doi: 10.3319/TAO.2013.01.31.01(T).
Gap : the largest azmuthal separation in degrees between stations.
RMS : root-mean-square error of the time residuals.
ERH : standard error of the epicenter in KM.
ERZ : standard error of the depth in KM.
Q : solution quality of the hypocenter based on the nature of station
distribution and RMS. It is classified into A, B, C, D 4 ranks
according to the following scheme:
Q No. of stations Gap Min. of Epicenter Dist. of sta.
A >= 6 <= 90 <= Depth or 5 Km
B >= 6 <= 135 <= 2 Depth or 10 Km
C >= 6 <= 180 < 50 Km
D others
focal depth control, F: free run, means the solution automatically
converge to min. error, X:fixed depth, means if the solution's not good,
then the depth will be given an emperial value to reach the min. error.