Abstract
To improve location identification, we employed layered mode joint hypocenters determination (JHD) and double-difference earthquake location algorithm (hypoDD), three-dimensions velocity structure location (3DLOC), and three-dimensions velocity structure with stations corrections location (3DCOR) for the Rueyli, Taiwan, earthquake sequence. We found that the 3DCOR can greatly improve the location identification precision of the Rueyli earthquake sequence. The Rueyli mainshock was relocated to 23.510˚N, 120.660˚E at the depth of 5.6 km. The focal depth is significantly deeper than the original CWBSN value of 2.8 km. Using this new location, a first-motion fault-plane solution shows that this earthquake is a thrust event with strike N53˚E, dip 42˚E, and rake 121˚. Based on the hypocentral distribution pattern ascertained after relocation and focal mechanism, the Rueyli earthquake was probably caused by faulting in the Tachienshan fault.
Highlights
The success of most seismological studies relies on the accuracy of earthquake locations
The accuracy of the hypocenter locations is controlled by several factors, including the net work geometry, available phases, arrival time reading accuracy, and knowledge of the crustal structure
The 3DCOR program is modified from the 3DLOC program with the station correction terms added in the location process
Summary
The success of most seismological studies relies on the accuracy of earthquake locations. TAO, Vol 14, No 4, December 2003 ducts eastward under the Philippine Sea plate off the southern tip of Taiwan The interactions between these two plates have resulted in a very complicated crustal structure in the Taiwan region. This complex and not well-determined velocity structure can cause large uncertainties in earthquake locations. We relocated the Rueyli earthquake sequence (Chang et al 1998; Wu et al 1998; Chen et al 1999; Chen et al 2003a, b), using the following computer programs: JHD, hypoDD (Waldhauser 2001), 3DLOC (Thurber and Eberhart-Phillips 1999), and 3DCOR. The 3DCOR program is modified from the 3DLOC program with the station correction terms added in the location process
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