caa a22 4500 445299606 CHVBK 20180317142553.0 cr unu---uuuuu 170323e20100901xx s 000 0 eng 10.1007/s11430-010-4045-5 doi (NATIONALLICENCE)springer-10.1007/s11430-010-4045-5 Source process of the 2010 Yushu, Qinghai, earthquake [Elektronische Daten] [Yong Zhang, LiSheng Xu, Yun-Tai Chen] The comprehensive waveform analysis of the Love waves and P waves shows that the Yushu M S7.1 (M W6.9) earthquake consists of two distinct sub-events. The first one occurred in the first 5 s releasing less seismic moment, and the second occurred in the later 11 s releasing more seismic moment. Spatially, the first sub-event surrounded the hypocenter, and the second, about 30 km away from the first, was much closer to the Yushu city and broke through the ground surface. In terms of the rupture velocity to which the peak values of the two sub-events correspond, the first sub-event propagated with an average rupture velocity of 1.6 km/s, however, the second propagated with an average rupture velocity of 4.0 km/s which is actually superior to the shear-wave velocity in the hypocentral region. The magnitude of the Yushu earthquake is in the lower margin of large earthquakes. The results obtained in this study indicate that the super-shear rupture possibly appears in earthquakes with magnitude of around 7.0, instead of only in the great earthquakes with magnitude around 8.0 [14, 15]. In addition, the energy focusing caused by the super-shear rupture should take key responsibility for the tremendous damage to the Yushu city as well as the ground-surface breakage related to the larger second sub-event. Science China Press and Springer-Verlag Berlin Heidelberg, 2010 Zhang Yong Institute of Geophysics, China Earthquake Administration, 100081, Beijing, China aut Xu LiSheng Institute of Geophysics, China Earthquake Administration, 100081, Beijing, China aut Chen Yun-Tai Institute of Geophysics, China Earthquake Administration, 100081, Beijing, China aut Science China Earth Sciences SP Science China Press 53/9(2010-09-01), 1249-1251 1674-7313 53:9<1249 2010 53 11430 https://doi.org/10.1007/s11430-010-4045-5 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11430-010-4045-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Zhang Yong Institute of Geophysics, China Earthquake Administration, 100081, Beijing, China aut NATIONALLICENCE 700 1- Xu LiSheng Institute of Geophysics, China Earthquake Administration, 100081, Beijing, China aut NATIONALLICENCE 700 1- Chen Yun-Tai Institute of Geophysics, China Earthquake Administration, 100081, Beijing, China aut NATIONALLICENCE 773 0- Science China Earth Sciences SP Science China Press 53/9(2010-09-01), 1249-1251 1674-7313 53:9<1249 2010 53 11430 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer