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The data set consists of manually picked data; NIED picks the arrival time at stations as distant from the epicenter as possible.
For the events that were relocated using only the manually picked data, the average location errors were 0.123 km in the EW direction, 0.106 km in the NS direction, and 0.188 km in the depth direction.
For the remaining events relocated using only the manually picked data, 2σ of the relative location errors are 50 m in the N S direction, 81 m in the E W direction, and 125 m in the depth direction.
The root-mean-square (RMS) of the double-difference time residual decreased from 95 to 30 ms for the manually picked data and decreased from 61 to 7 ms for the cross-correlation data.
After the application of the DD method, the root mean square (RMS) of the double-difference time residual decreased from 192 ms to 130 ms for the manually picked data and from 87 ms to 6 ms for the cross-correlation data.
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We used 31,740 and 16,729 data for the absolute arrival times of the P- and S-waves, respectively, and 68,934 and 31,638 data for the differential times calculated by manually picking data for the P- and S-waves for event pairs within 10 km, respectively (Waldhauser and Ellsworth 2000).
Using both the manually picked and cross-correlation data, 96% of the earthquakes were relocated.
For S waves, there were 47,823 and 31,630 pairs of manually picked and cross-correlated data, respectively.
By using both the manually picked and cross-correlation data, we relocated 218 earthquakes down to M0.6 (53 earthquakes with M ≥ 2.0) during the 2 weeks after the first earthquake of the cluster activity on January 27 , 2012at 22 39 UT.
As a result, two standard deviations (2σ) of the relative location errors for the events relocated using both the manually picked and cross-correlation data are 26 m in the N S direction, 30 m in the E W direction, and 65 m in the depth direction.
As a result, the average relative location errors were 0.017 km in the EW direction, 0.015 km in the NS direction, and 0.023 km in the depth direction for the earthquakes that were relocated using both the manually picked and cross-correlation data.
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