Relocation of Earthquakes near the Puqian-Qinglan Fault and Preliminary Analysis of Tectonic Significance
XU Xiaofeng
WANG Huilin
HU Jiuchang
SUN Peiwen
Abstract：Puqian-Qinglan fault is one of the most active seismotectonic faults of Hainan island. The fault constituted the seismotectonic fault of M 71/2 earthquake in 1605. Small earthquakes near the Puqian-Qinglan fault are still more active, and earthquakes are basically arranged in north -south direction, which doesn't correspond completely consistent with the southern part of Puqian-Qinglan fault. Based on the data recorded by digital seismic network of Hainan province during January 2000 and December 2014, the paper relocated the 128 small earthquakes by using the double-difference earthquake location method, and got 118 new parameters of the earthquake source. and the resuls show that the trend of earthquake distribution is NW2. The corresponding is not particularly well between fitting fault and Puqian-Qinglan fault, which maybe due to the fact that the active age of the northern section of Puqian-Qinglan fault is Holocene, the active age of the southern section of Puqian-Qinglan fault is early middle Pleistocene, southern earthquake activity moving toward west, inferring that the change related to the magma capsule.
Keywords：Double difference location methodPuqian-Qinglan faultSeismic structureSeismic activityFocal depth
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 10-16 )