Growing correlation length of moderate-sized earthquakes prior to two great earthquakes near Sumatra Island  

作　　者：Rong Dailu Li Yarong 

机构地区：[1]Lanzhou Institute of Seismology,China Earthquake Administration,Lanzhou 730000,China

出　　处：《Geodesy and Geodynamics》2012年第3期29-33,共5页大地测量与地球动力学（英文版）

摘　　要：Seismic correlation length for moderate earthquakes prior to two great earthquakes in the northern sea area of Sumatra Island （Mw9.1 in 2004 and MsS. 6 in 2012） has been studied, using method of Single- Link-Cluster （ SLC ） analysis, and found to show a power-law growth about two years before their occurrences. No such growth was found for a magnitude 7 earthquake in the same area. This result suggests the occurrence of a physical process of critical-point characteristics in the source area before the great earthquakes.Seismic correlation length for moderate earthquakes prior to two great earthquakes in the northern sea area of Sumatra Island （Mw9.1 in 2004 and MsS. 6 in 2012） has been studied, using method of Single- Link-Cluster （ SLC ） analysis, and found to show a power-law growth about two years before their occurrences. No such growth was found for a magnitude 7 earthquake in the same area. This result suggests the occurrence of a physical process of critical-point characteristics in the source area before the great earthquakes.

关 键 词：northern sea area of Sumatra Island earthquake critical-point characteristics seismic spatial- correlation length single-link cluster analysis （ SLC ） 

分 类 号：P315.9[天文地球—地震学] Q959.848[天文地球—固体地球物理学]