Slip rate along the Lijiang-Ninglang fault zone estimated from repeating microearthquakes  

作　　者：LI Le CHEN QiFu NIU FengLin FU Hong LIU RuiFeng HOU YanYan 

机构地区：[1]Institute of Earthquake Science, China Earthquake Administration, Beijing 100036, China [2]Rice University, Houston TX 77005, USA [3]Yunnan Earthquake Administration, Kunming 650224, China [4]China Earthquake Networks Center, Beijing 100045, China

出　　处：《Chinese Science Bulletin》2009年第3期447-455,共9页

基　　金：Supported by National Basic Research Program of China (Grant No. 2004CB418405);National Natural Science Foundation of China (Grant No. 40174014)

摘　　要：Seismicity 并且沿着在 1999 和 2006 之间的 Lijiang-Ninglang 差错地区滑动率被调查，波形数据由云南数字地震网络记录了。由双差别方法的重定位的 seismicity 清楚地展出在北、南部的片断之间的不同特征。超过 76% 地震在丽江区域附近发生在差错的南部的片断。重定位的 seismicity 看起来反映学习区域的外壳的速度结构。用跨关联的分析，我们识别了显示出高波形类似的 92 件马甲和 70 根多重谱线的一个总数。大多数这些序列是非周期的，复发间隔从一些分钟变化到几百天。用在学习时期上定期发生了的二个序列，我们获得了一个差错在 ∼23 km 滑动约 5 mm/a 的率，在对的好同意地质并且表面 GPS 测量。Seismicity and slip rates along the Lijiang-Ninglang fault zone between 1999 and 2006 were investigated with the waveform data recorded by the Yunnan digital Seismic Network. The relocated seismicity by the double difference method clearly exhibits different features between the northern and southern segments. More than 76% earthquakes occurred in the southern segment of the fault near the Lijiang area. The relocated seismicity appears to reflect the crustal velocity structure of the study area, Using cross-correlation analysis, we identified a total of 92 doublets and 70 multiplets that show high waveform similarity. Most of these sequences are aperiodic with recurrence intervals varying from a few minutes to hundreds of days. Using two sequences that occurred regularly over the study period, we obtained a fault slip rate of approximately 5 mm/a at -23 km, in good agreement with geologic and surface GPS measurement.

关 键 词：断层带 反复地震 断层滑动率 地质学 

分 类 号：P315[天文地球—地震学]