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The Tongliao MS5.3 Earthquake and Its Foreshock Determination
Wang Shubo,Zhuoli Getu,Li Juan
Author NameAffiliationE-mail
Wang Shubo Earthquake Agency of Inner Mongolia Autonomous Region, Hohhot 010010, China  
Zhuoli Getu Earthquake Agency of Inner Mongolia Autonomous Region, Hohhot 010010, China zhuoligetu@eqhb.gov.cn 
Li Juan Earthquake Agency of Inner Mongolia Autonomous Region, Hohhot 010010, China  
摘要:
Taking the 2013 Tongliao MS5.3 earthquake as a research subject, on the basis of statistical analysis of earthquake sequence using the HypoDD location method and focal mechanism solutions, the paper analyzes and discusses the relationship between the ML4.4 and MS5.3 earthquakes. The results show that the Tongliao MS5.3 earthquake occurred under the background of medium-small earthquakes' long-term quiescence and short-term enhancement in the epicentral area. The results of accurate seismic location shows that the Tongliao MS5.3 earthquake sequence is distributed in the NW direction, extending 10km, and the ML ≥ 3.0 aftershocks are concentrated south of the mainshock. The distance between the MS5.3 mainshock and the ML4.4 foreshock is about 1.8km, with a focal depth of 7.208km and 7.089km, respectively,their focal location is very close,and may have occurred on the same fault plane. The results of focal mechanism shows that the Tongliao MS5.3 earthquake is of the strike-slip type, the focal mechanism of aftershocks are disordered, and with time lapse, the type is changed from strike-slip to thrust and normal faulting. The bigger foreshocks had similar focal mechanism and were all normal fault types, which exhibits to some extent, an obvious crustal medium anisotropy in the epicentral area before macroscopic rupturing, as represented by alignment fractures, with stress action enhanced, this "consistency" of seismic precursor regime would gestate the mainshock. According to the characteristics of temporal-spatial distribution of earthquake sequence and similarity of focal mechanism, we judge that the Tongliao MS 5.3 earthquake sequence is a foreshock-mainshock-aftershock type.
关键词:  Tongliao MS5.3 earthquake  HypoDD location  CAP  Focal mechanism similarity  Foreshock determination
DOI:
分类号:
基金项目:This research sponsored by Science and Technology Major Project of Inner Mongolia Autonomous Region, entitled "Research, development and promotion of earthquake prediction and early warning technology in key areas". Seismic Regime Tracking Project of CEA, No.2018010124.
The Tongliao MS5.3 Earthquake and Its Foreshock Determination
Wang Shubo,Zhuoli Getu,Li Juan
Abstract:
Taking the 2013 Tongliao MS5.3 earthquake as a research subject, on the basis of statistical analysis of earthquake sequence using the HypoDD location method and focal mechanism solutions, the paper analyzes and discusses the relationship between the ML4.4 and MS5.3 earthquakes. The results show that the Tongliao MS5.3 earthquake occurred under the background of medium-small earthquakes' long-term quiescence and short-term enhancement in the epicentral area. The results of accurate seismic location shows that the Tongliao MS5.3 earthquake sequence is distributed in the NW direction, extending 10km, and the ML ≥ 3.0 aftershocks are concentrated south of the mainshock. The distance between the MS5.3 mainshock and the ML4.4 foreshock is about 1.8km, with a focal depth of 7.208km and 7.089km, respectively,their focal location is very close,and may have occurred on the same fault plane. The results of focal mechanism shows that the Tongliao MS5.3 earthquake is of the strike-slip type, the focal mechanism of aftershocks are disordered, and with time lapse, the type is changed from strike-slip to thrust and normal faulting. The bigger foreshocks had similar focal mechanism and were all normal fault types, which exhibits to some extent, an obvious crustal medium anisotropy in the epicentral area before macroscopic rupturing, as represented by alignment fractures, with stress action enhanced, this "consistency" of seismic precursor regime would gestate the mainshock. According to the characteristics of temporal-spatial distribution of earthquake sequence and similarity of focal mechanism, we judge that the Tongliao MS 5.3 earthquake sequence is a foreshock-mainshock-aftershock type.
Key words:  Tongliao MS5.3 earthquake  HypoDD location  CAP  Focal mechanism similarity  Foreshock determination