地震学报（英文版）2004，Vol.17Issue(2)：125-130,6.
Relocation of the 1998 Zhangbei-Shangyi earthquake sequence using the double difference earthquake location algorithm
Relocation of the 1998 Zhangbei-Shangyi earthquake sequence using the double difference earthquake location algorithm
摘要
Abstract
On January 10, 1998, at 11h50min Beijing Time (03h50min UTC), an earthquake of ML=6.2 occurred in the border region between the Zhangbei County and Shangyi County of Hebei Province. This earthquake is the most significant event to have occurred in northern China in the recent years. The earthquake-generating structure of this event was not clear due to no active fault capable of generating a moderate earthquake was found in the epicentral area,nor surface ruptures with any predominate orientation were observed, no distinct orientation of its aftershock distribution given by routine earthquake location was shown. To study the seismogenic structure of the ZhangbeiShangyi earthquake, the main shock and its aftershocks with ML≥3.0 of the Zhangbei-Shangyi earthquake sequence were relocated by the authors of this paper in 2002 using the master event relative relocation technique.The relocated epicenter of the main shock was located at 41.145°N, 114.462°E, which was located 4 km to the NE of the macro-epicenter of this event. The relocated focal depth of the main shock was 15 km. Hypocenters of the aftershocks distributed in a nearly vertical plane striking 180°～200° and its vicinity. The relocated results of the Zhangbei-Shangyi earthquake sequence clearly indicated that the seismogenic structure of this event was a NNE-SSW-striking fault with right-lateral and reverse slip. In this paper, a relocation of the Zhangbei-Shangyi earthquake sequence has been done using the double difference earthquake location algorithm (DD algorithm), and consistent results with that obtained by the master event technique were obtained. The relocated hypocenters of the main shock are located at 41.131 °N, 114.456°E, which was located 2.5 km to the NE of the macro-epicenter of the main shock. The relocated focal depth of the main shock was 12.8 km. Hypocenters of the aftershocks also distributed in a nearly vertical N10°E-striking plane and its vicinity. The relocated results using DD algorithm clearly indicated that the seismogenic structure of this event was a NNE-striking fault again.关键词
Zhangbei-Shangyi earthquake/double difference earthquake location algorithm/earthquakerelocation/seismogenic structure/source processKey words
Zhangbei-Shangyi earthquake/double difference earthquake location algorithm/earthquakerelocation/seismogenic structure/source process分类
天文与地球科学引用本文复制引用
杨智娴,陈运泰..Relocation of the 1998 Zhangbei-Shangyi earthquake sequence using the double difference earthquake location algorithm[J].地震学报（英文版）,2004,17(2):125-130,6.基金项目
Key Project "Process, Mechanism and Prediction of Geological Hazards" from Ministry of Science and Technology of China (2001CB711005-1-3) （2001CB711005-1-3）
State Key Basic Research Development and Programming Project "Mechanism and Prediction of Continental Strong Earthqu （）
