Characteristics of the active Luoshan Fault since Late Pleistocene, North Central China

• Main Authors: M. Fengying, Z. Peizhen, C. Chizhang, J. Decheng, M. Wei
• Format: Article
• Language: English
• Published: Istituto Nazionale di Geofisica e Vulcanologia (INGV) 2003-06-01
• Series: Annals of Geophysics
• Subjects: northeastern margin of Tibet plateau; paleoseismology; slip-rate
• Online Access: http://www.annalsofgeophysics.eu/index.php/annals/article/view/3442
• ISSN: 1593-5213; 2037-416X

The Luoshan Fault located at the northeastern margin of Tibet plateau strikes roughly N-S, and is composed of
 six left-stepping sections with a total length of 60 km. Much evidence suggests that the Luoshan Fault is a reverse
 right-lateral strike-slip fault. The largest right-lateral strike-slip displacement and the most abundant dextral
 offset phenomena are located along the central section. Based on the right-lateral strike-slip offsets of the oldest
 alluvial fan, and of a gully and on the average displacement of the same order of gullies, the minimum slip-rate
 has been 2.15 ± 0.2 mm/yr since Late Pleistocene. Many surface rupture phenomena, such as fault scarps with
 fresh free-face, ground fissures, displacements of very young gullies, imply that a recent earthquake occurred
 along this fault. Combining the historical catalogue and our results, we believe that the 1561 A.D. earthquake
 was produced by the Luoshan Fault. Three paleoearthquakes were determined by means of paleoseismic studies
 along the Luoshan Fault: they occurred after 8200 ± 600 years BP, between 3130 ± 240 years BP and 4150 ±
 ± 120 years C.BP, and before 2230 ± 170 years BP, respectively.