Identification and spatio-temporal characteristics of repeating earthquakes in Kepingtage fault zone

According to the definition of repeating earthquakes that the waveform cross-correlation coefficient is not less than 0.8, intraplate repeating earthquakes in and around Kepingtage fault zone, XinJiang, were identified and studied using waveform data recorded at WUS and BCH national digital seismic stations. Waveform cross-correlation analysis was carried out after 0.5-5.0 Hz bandpass-filtering on vertical components records from the events being less than 30 km away from each other. Altogether 460 repeating earthquakes were identified from WUS station, which comprised 171 doublets and multiplets, making up 15.5% of total events; 822 repeating earthquakes were identified from BCH station, which comprised 298 doublets and multiplets, making up 21.2% of total events. Our analysis of the repeating earthquakes show that the difference in the number and proportion of repeating earthquakes between the two stations is attributed to the difference in the distribution of stations and waveform record quality. Statistics show that the time interval between repeating earthquakes ranges from a few minutes to hundreds of days, the longest being 10 years.