2017年8月8日四川九寨沟MS7.0地震前甘肃南部地区视应力变化
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P315

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重庆市地震局科研项目“用背景噪声和天然地震反演三峡库区岩石圈速度结构”资助


The apparent stress variation in southern Gansu before the Jiuzhaigou MS7.0 earthquake in Sichuan on August 8,2017
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    摘要:

    利用甘肃省区域台网提供的地震波形资料,计算甘肃南部地区2010年1月~2017年8月ML≥2.0地震的视应力,分析九寨沟地震前甘南地区视应力的时空演化特征,所得结果如下:①ML2.6~3.1、ML2.0~2.5震级段地震视应力的空间分布具有较好的一致性,九寨沟MS7.0地震前,距震中较近的川甘交界地区的舟曲、文县等地呈现出较为集中的视应力高值异常;②ML2.0~2.5、ML2.6~3.1地震的视应力在大区域范围内随时间的变化趋势有一定差异,ML2.6~3.1地震视应力变化更为明显,在较大区域范围内表现为震前显著升高,而ML2.0~2.5地震视应力则在震前一两年内开始下降;③随着区域划分范围向震中靠近,ML2.0~2.5、ML2.6~3.1地震视应力的变化逐渐趋于一致,至震中附近时,2个震级段视应力均表现为“震前几年长时间升高—临震前几个月下降”的同步变化。

    Abstract:

    Based on the waveform data observed by the Regional Digital Seismic Network of Gansu Province, we calculated the apparent stress of the ML ≥ 2.0 earthquakes in the southern Gansu from January 2010 to August 2017, and obtained the temporal-spatial variations of apparent stress. Results show that the distribution of apparent stress with ML2.0~2.5 and ML2.6~3.1 was consistent, both concentrating in the border region of Sichuan and Gansu before the Jiuzhaigou earthquake. The change trend of apparent stress over time with ML2.0~2.5 and ML2.6~3.1 was different within the large area:The apparent stress with ML2.6~3.1 was more apparent and increased significantly before the Jiuzhaigou earthquake, while the apparent stress with ML2.0~2.5 declined one or two year before. The spatial variation of apparent stress with ML2.0~2.5 and ML2.6~3.1 became more similar when the study area was closer to the epicenter, the apparent stress kept increasing a few years before the earthquake and suddenly declined a few months before the earthquake.

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陈丽娟,陈继锋,龚丽文,陈学忠.2017年8月8日四川九寨沟MS7.0地震前甘肃南部地区视应力变化[J].中国地震,2017,33(4):521-531

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  • 收稿日期:2017-09-11
  • 最后修改日期:2017-10-31
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  • 在线发布日期: 2018-02-27
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