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Source rupture process of Lushan M7.0 earthquake, Sichuan, China and its tectonic implications.

Source rupture process of Lushan M7.0 earthquake, Sichuan, China and its tectonic implications.

Authors :
Zhao, CuiPing
Zhou, LianQing
Chen, ZhangLi
Source :
Chinese Science Bulletin; Oct2013, Vol. 58 Issue 28/29, p3444-3450, 7p
Publication Year :
2013

Abstract

The source rupture process of the M7.0 Lushan earthquake was here evaluated using 40 long-period P waveforms with even azimuth coverage of stations. Results reveal that the rupture process of the Lushan M7.0 event to be simpler than that of the Wenchuan earthquake and also showed significant differences between the two rupture processes. The whole rupture process lasted 36 s and most of the moment was released within the first 13 s. The total released moment is 1.9×10N m with M=6.8. Rupture propagated upwards and bilaterally to both sides from the initial point, resulting in a large slip region of 40 km×30 km, with the maximum slip of 1.8 m, located above the initial point. No surface displacement was estimated around the epicenter, but displacement was observed about 20 km NE and SW directions of the epicenter. Both showed slips of less than 40 cm. The rupture suddenly stopped at 20 km NE of the initial point. This was consistent with the aftershock activity. This phenomenon indicates the existence of significant variation of the medium or tectonic structure, which may prevent the propagation of the rupture and aftershock activity. The earthquake risk of the left segment of Qianshan fault is worthy of attention. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
10016538
Volume :
58
Issue :
28/29
Database :
Complementary Index
Journal :
Chinese Science Bulletin
Publication Type :
Academic Journal
Accession number :
90672672
Full Text :
https://doi.org/10.1007/s11434-013-6017-6