The M5.0 Suining-Tongnan (China) earthquake of 31 January 2010: A destructive earthquake occurring in sedimentary cover

被引:25
作者
Luo Yan [2 ]
Ni SiDao [1 ]
Zeng XiangFang [3 ]
Xie Jun [3 ]
Chen Yong [3 ]
Long Feng [3 ]
机构
[1] Chinese Acad Sci, Inst Geodesy & Geophys, Wuhan 430077, Peoples R China
[2] China Earthquake Adm, Inst Earthquake Sci, Beijing 100036, Peoples R China
[3] Univ Sci China, Sch Earth & Space Sci, Menghcheng Natl Geophys Observ, Hefei 230026, Peoples R China
来源
CHINESE SCIENCE BULLETIN | 2011年 / 56卷 / 06期
关键词
Suining-Tongnan Earthquake; sedimentary cover; damaging earthquake; RG; DISCRIMINANT; EXPLOSIONS; VELOCITY; WAVES;
D O I
10.1007/s11434-010-4276-2
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Usually, only crystalline basement is strong enough to store the massive strain energy that can be released in a damaging earthquake. By contrast, sedimentary cover is weak, because of its relatively high porosity and fluids. Therefore, it generally cannot accumulate enough energy for strong earthquakes. On January 31, 2010, a M5.0 earthquake occurred near the border of Suining and Tongnan in China. It excited strong short-period Rayleigh waves Rg, indicative of its shallow focal depth. The focal depth is constrained to less than 4 km, most probably in the range of 1-3 km, by modeling amplitude dependence on the frequency and waveforms of teleseismic depth phases (pP, sP). Because the local Mesozoic sedimentary cover is about 6 km thick, this earthquake should have occurred in the sedimentary cover. Though some shallow earthquakes with magnitudes up to M4 occur in Paleozoic sediments, this earthquake is the first M5 event studied in Mesozoic sedimentary cover. This event provides a rare opportunity to study seismogenic processes of damaging earthquakes in sedimentary basins.
引用
收藏
页码:521 / 525
页数:5
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