2019年2月2日新疆塔城M_S5.2地震房屋震害特点与发震构造

Seismic Disaster Characteristics of Buildings and Seismogenic after the Xinjiang M_S5.2 Earthquake on February 2, 2019

2019年2月2日新疆塔城市发生M_S5.2地震,根据现场震害调查确定本次地震极震区烈度为Ⅵ度。地震造成震中附近20世纪八、九十年代建造的个别土木结构房屋出现中等程度以上破坏,少数轻微破坏(含旧裂缝加宽),多数基本完好;其他结构类型房屋多数基本完好。本次地震震级小、有感范围广,震区土木结构房屋缺少抗震措施、年久失修、地基处理不当是造成房屋出现破坏的主要原因。综合分析等震线分布及深部构造特征,初步判定本次地震发震构造为塔克台断裂向塔城盆地迁移、扩展的隐伏断裂。

An M_S5.2 earthquake occurred on February 2, 2019 in Tacheng, Xinjiang. The earthquake intensity is VI degree. Based on a field survey and a related data analysis, we reached two conclusions. First, the earthquake didn’t cause large-scale collapse and destruction. The earthquake caused a moderate degree of damage to individual soil-wood in the 1980 s and 1990 s near the epicenter, and a few minor damages(including the increase of old cracks);most of the other types of buildings are basically intact. Although the earthquake has a small magnitude it has a wide sensible area. Lack of seismic construction measures, disrepair for years and improper foundation treatment is the main cause of damage for earthquake-stricken houses. Second, the seismogenic structure causing this earthquake was located at Tacheng basin, a hidden fault that migrated and expanded from the Taktai fault to the Tacheng Basin.