江苏高邮—宝应M_S4.9地震强震动观测与记录分析  

Strong Motion Observation and Records of the Gaoyou-Baoying M_S4.9 Earthquake in Jiangsu Province

作　　者：王恒知[1] 李稳 詹小艳[1] 朱升初[1] 何斌[1] 薛莹莹[1] 

机构地区：[1]江苏省地震局,江苏南京210014 [2]地球物理勘探中心,河南郑州450002

出　　处：《地震工程学报》2014年第3期734-740,共7页China Earthquake Engineering Journal

基　　金：江苏省地震局青年科学基金项目(11419)

摘　　要：2012年7月20日江苏高邮—宝应交界处发生MS4.9地震,对江苏省数字强震动台网43个台站获取的强震记录进行初步分析得出,地震的最大水平向加速度为33.76 cm/s2,并计算地震的仪器烈度,得出烈度分布等值线图,与地震现场实际调查的烈度分布情况基本一致。The strong motion of the Gaoyou-Baoying MS4. 9 earthquake occurring on July 20, 2012, was recorded by 43 of 50 strong motion stations in Jiangsu Province. The observation system of every strong earthquake station includes the Etna strong motion recorder produced by the KMI Company in addition to a domestic force balance accelerometer（FBA）sensor. These instruments effectively recorded the earthquake ground motion that occurred in Jiangsu Province by setting the appropriate threshold and transmitting the strong motion events through PSTN or CDMA wireless networks to the digital strong motion network center of Jiangsu Province. During this earthquake, the recorded maximum acceleration was 33. 76 cm/s2 . The earthquake epicenter was located at 33. 04＆#176;N, 119. 57＆#176;E, and the focal depth was approximately 6 km. The microcosmic-epi-center was located in Shuanggou Village, Gaoyou City, where strong earthquake motion was felt. Tremors were felt throughout Jiangsu Province, as well parts of Anhui Province at its junction with Jiangsu Province. Fourier spectral analysis was used to determine that the seismic accelera-tion included abundant frequency components mainly between 2 Hz and 4 Hz. The acceleration time history and Fourier spectrum records from several strong ground motion stations are also given in this paper. Moreover, this study gives a brief introduction of the American ShakeMap system, which is the primary method used to calculate instrument intensity, and a recommended intensity scale provided. We collected recent strong earthquake records of Jiangsu Province and fit the instrumental intensity calculation formula （below intensity of VI）with these strong earth-quake records. Due to the limited earthquake records in this region, however, we were unable to give a complete intensity calculation formula. Finally, two methods of producing an intensity con-tour map are given in addition to comparisons between approaches and conclusions. The character-istics of the seismic intensity contour are int

关 键 词：峰值加速度 傅氏谱 仪器烈度 烈度等值线 

分 类 号：P315.914[天文地球—地震学]