| 2012年河北唐山4.8级地震前后波速比变化特征 |
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| 引用本文： | 李冬圣,王莉婵,王宁,蔡玲玲,贾炯,李小军. 2012年河北唐山4.8级地震前后波速比变化特征[J]. 华北地震科学, 2019, 37(3): 62-66 |
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| 作者姓名： | 李冬圣 王莉婵 王宁 蔡玲玲 贾炯 李小军 |
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| 作者单位： | 河北省地震局,石家庄,050021;河北省地震局,石家庄,050021;河北省地震局,石家庄,050021;河北省地震局,石家庄,050021;河北省地震局,石家庄,050021;河北省地震局,石家庄,050021 |
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| 基金项目： | 河北省地震局科技星火计划项目;河北省地震局测震专业仪器系统检测评估与观测场地遴选创新团队 |
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| 摘 要： | 选取河北数字地震遥测台网2008年1月至2018年4月产出的唐山震区范围内地震观测报告数据,利用单台和多台和达法对2012年5月河北唐山4.8级地震前后波速比进行计算。结果显示:单台和达法波速比计算得出陡河台等7个台站在唐山4.8级地震前存在低值异常;多台和达法计算波速比在ML≥1.0、ML≥1.5,ML≥2.0不同震级的波速比变化曲线与唐山4.8级地震对应较好,震前存在近一年的波速比低值变化。
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| 关 键 词： | 唐山4.8级地震 波速比 单台和达法 多台和达法 |
Variation Characteristic of Wave Velocity Ratio before and after Hebei Tangshan M_S4.8 Earthquake in 2012 |
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| LI Dongsheng,WANG Lichan,WANG Ning,CAI Lingling,JIA Jiong,LI Xiaojun. Variation Characteristic of Wave Velocity Ratio before and after Hebei Tangshan M_S4.8 Earthquake in 2012[J]. North China Earthquake Sciences, 2019, 37(3): 62-66 |
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| Authors: | LI Dongsheng WANG Lichan WANG Ning CAI Lingling JIA Jiong LI Xiaojun |
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| Affiliation: | (Hebei Earthquake Agency,Shijiazhuang 050021,China) |
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| Abstract: | Based on the observation report of seismic phases recorded by Hebei Digital Seismic Network from Jan.2008 to Apr.2018,we analyze the variation of wave velocity ratio before and after the 2012 Tangshan M_S4.8 earthquake using the Wadati method of single station and the multiple-station.The result shows a low value anomaly existing before the earthquake in Douhe and other 7 stations with Wadati method of single station.The wave velocity ratio of ML≥1.0,ML≥1.5,ML≥2.0 and different magnitudes calculated by Wadati method of multiple-station corresponds well to the Tangshan MS4.8 earthquake.There is a low wave velocity ratio anomaly existing nearly one year before the earthquake. |
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| Keywords: | Tangshan MS4.8 earthquake wave velocity ratio Wadati method of single station Wadati method of multiple-staion |
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