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四川省地震局地震测量队在1973年2月6日炉霍7.9级地震破裂带上的虾拉沱场地进行了地面槽探。经初步考察,发现了因地震房屋倒塌的遗迹,它们分别埋深于0.9—2.2米及1.9—3.58米,推测是1923、3、24及1816、12、8两次大地震所致。因此,虾拉沱地区在158年间共发生了三次烈度为Ⅹ的地震。 由于多次大地震的重复发生,槽探中见到了间距5—10米的四组地震断层,它们分别为1973、1923和1816年地震形成的。
The seismic survey team of Sichuan Seismological Bureau conducted surface trenching at the shrimp Labuan site on the rupture zone of the MS7.0 earthquake on February 6, 1973. After preliminary investigation, it was discovered that the ruins of the earthquake collapsed houses were buried at 0.9-2.2 meters and 1.9-3.58 meters respectively, presumably due to the earthquakes of 1923, 3, 24 and 1816, 12 and 8 respectively. Therefore, a total of three earthquakes of intensity X occurred during 158 years in shrimp and Lhasa area. Due to the repeated occurrences of many large earthquakes, four sets of seismic faults were observed in the trenches at intervals of 5-10 meters, which were formed respectively by the 1973, 1923 and 1816 earthquakes.