A NEW FINDING OF SURFACE RUPTURE ZONES ASSOCIATED WITH THE 1936 LINGSHAN M6(3/4) EARTHQUAKE,GUANGXI, CHINA |
| |
| Authors: | LI Xi-guang LI Bing-su PAN Li-li NIE Guan-jun WU Jiao-bing LU Jun-hong YAN Xiao-min LI Zhi-yong |
| |
| Affiliation: | 1.Earthquake Administration of the Guangxi Zhuang Autonomous Region, Nanning 530022, China;2.Guangxi Mechanical and Electronic Industry School, Nanning 530023, China;3.School of Earth Sciences, China University of Geosciences, Wuhan 430074, China |
| |
| Abstract: | On April 1, 1936, an M6(3/4) earthquake occurred on the Fangcheng-lingshan Fault. This event is the biggest historical earthquake on the coastal seismic zone, South China ever. But so far, no any findings about the surface rupture of this event have been reported. This paper is the first to find several intact surface rupture zones associated with the 1936 Lingshan seismic event, in the areas of Gaotang, Jiaogengping etc. on the northeast segment of the Fangcheng-Lingshan Fault. According to the field work, the surface rupture stretches to 10km and distributes along NE direction in front of Luoyang Mountain, represented by earthquake scarp, extensional fracture, dextrally faulted gully and river system etc. The characteristics of surface ruptures and faulted landforms indicate that the surface rupture is of normal-dextral strike slip faulting. The trenching on this fault exposed that at least three seismic events have been recorded, including two historical earthquake events and the latest one is the 1936 Lingshan M6(3/4) earthquake. These surface rupture zones are the key to the detection of seismogenic structure and the re-estimate of magnitude of this event. The new finding of these surface rupture zones would be particularly significant for the detection of the seismogenic structure of Lingshan M6(3/4) earthquake. |
| |
| Keywords: | the 1936 Lingshan M6(3/4) earthquake surface rupture the Fangcheng-Lingshan Fault the Zhaixu Fault trenching |
|
|
