1 The Institute of Disater Prevention of China Earthquake Administration, Sanhe 065201, China 2 College of Mathematics and Information Science, Langfang Teachers’ College, Langfang 065000, China
Application of fuzzy clustering method to determining sub-fault planes of earthquake from aftershocks sequence
1 The Institute of Disater Prevention of China Earthquake Administration, Sanhe 065201, China 2 College of Mathematics and Information Science, Langfang Teachers’ College, Langfang 065000, China
摘要Earthquake rupture process generally involves several faults activities instead of a single fault. A new method using both fuzzy clustering and principal component analysis makes it possible to reconstruct three dimensional structure of involved faults in earthquake if the aftershocks around the active fault planes distribute uniformly. When seismic events are given, the optimal faults structures can be determined by our new method. Each of sub-fault planes is fully characterized by its central location, length, width, strike and dip. The resolution determines the number of fault segments needed to describe the earthquake catalog. The higher the resolution, the finer the structure of the reconstructed fault segments. The new method successfully reconstructs the fault segments using synthetic earthquake catalogs. By taking the 28 June 1992 Landers earthquake occured in southern California as an example, the reconstructed fault segments are consistent with the faults already known on geological maps or blind faults that appeared quite frequently in longer-term catalogs.
Abstract：Earthquake rupture process generally involves several faults activities instead of a single fault. A new method using both fuzzy clustering and principal component analysis makes it possible to reconstruct three dimensional structure of involved faults in earthquake if the aftershocks around the active fault planes distribute uniformly. When seismic events are given, the optimal faults structures can be determined by our new method. Each of sub-fault planes is fully characterized by its central location, length, width, strike and dip. The resolution determines the number of fault segments needed to describe the earthquake catalog. The higher the resolution, the finer the structure of the reconstructed fault segments. The new method successfully reconstructs the fault segments using synthetic earthquake catalogs. By taking the 28 June 1992 Landers earthquake occured in southern California as an example, the reconstructed fault segments are consistent with the faults already known on geological maps or blind faults that appeared quite frequently in longer-term catalogs.
基金资助:the financial support of the Teachers Scientific and Research Fund of China Earthquake Administration (20090126), the Natural Science Fund of Hebei Province (A2011408006) and the Fundamental Research Funds for the Central Universities (ZY20110101) as well as the helpful comments from anonymous referee, and the editor
通讯作者:
Fuchang Wang
E-mail: 13832667401@126.com
引用本文:
Fuchang Wang, Yongge Wan, Huirong Cao, Zhitong Jin, Qingqing Ren. Application of fuzzy clustering method to determining sub-fault planes of earthquake from aftershocks sequence[J]. 《地震学报》英文版, 2012, 25(2): 187-196.
Fuchang Wang, Yongge Wan, Huirong Cao, Zhitong Jin, Qingqing Ren. Application of fuzzy clustering method to determining sub-fault planes of earthquake from aftershocks sequence. Earthquake Science, 2012, 25(2): 187-196.
