2013年甘肃岷县—漳县6.6级地震仪器烈度与宏观调查烈度比较分析

A Comparison and Analysis of Instrumental Intensity and Macroseismic Survey Intensity of the 2013 Minxian—Zhangxian M_S6.6 Earthquake in Gansu Province

对西北强震动台网中心收集的2013年7月22日甘肃岷县—漳县MS6.6地震117组三分向加速度记录进行处理和初步分析,计算出相应的仪器烈度值。将该值与岷县漳县地震烈度图(中国地震局,2013)中的烈度区值进行对比,偏差在1度以内的占台站总数的81.8%。将地震仪器烈度与强震台站周边5km内调查点烈度对比分析,完全吻合的台站占50%,略低于芦山地震58.6%。灾害调查分析认为岷县—漳县地震灾区建筑以土木结构和木结构为主,在相同烈度情况下,破坏比例大于其他地区。因此,虽然仪器烈度与震后宏观调查烈度不能达到完全吻合,但前者在一定程度上反映了震害情况,可快速为应急救援决策提供依据。另外,震后宏观烈度资料是一定区域范围内的平均或延伸,而强震数据只是个别点上的数据,不能忽略两者之间的差异性。

()n July22,2013,an Ms6.6earthquake occurred at the border area between Minxian and Zhangxian Counties^Gansu Province.In this study,117groups of three-component accelera-tion records collected by the Northwestern Strong Motion Networks Center were processed and analyzed,and the resultant instrumental intensity values were calculated and analyzed.The in-strumental intensities and the intensities obtained from the Minxian-Zhangxian seismic intensity map(China Earthquake Administration,2013)were compared and analyzed,and the stations with deviations less than1degree were determined to account for81.8%.The instrumental inten-sities and the intensities of surveying points within5km around the stations were also compared*and the stations with the same intensity account for50%.The disaster investigation and analysis indicate that most buildings in the Minxian-Zhangxian earthquake-stricken area are of civil and wood structures?and they are more heavily damaged than other regions that experienced the earthquake at the same intensity.Although the instrumental intensity is not quite consistent with the microseismic intensity^the instrumental intensity reflects the earthquake disaster to a certain extent and provides the basis for determining emergency rescue.