地震研究

利用风云三系卫星FY-3A和FY-3C的长波辐射产品,构建长波辐射背景场,计算玉树MS7.1和九寨沟M7.0地震前后羌塘、巴颜喀拉、柴达木块体的距平变化及异常指数以期获得异常信息。结果表明:①玉树和九寨沟地震前都出现了OLR值的升高。②玉树震前,羌塘块体、巴颜喀拉块体异常指数最大分别为4.2倍、3.5倍标准差,异常指数回落后,地震发生; 九寨沟震前,羌塘、巴颜喀拉和柴达木块体在7月下旬的异常指数分别超过2.6,2.78和1.1倍标准差,异常指数下降后,地震发生。③2次地震前,距平和异常指数均存在异常,二者的变动或许和块体间和块体内部应力积累和卸载有关,也说明了震前长波辐射有记录区域异常现象的能力。

Based on the Outgoing Longwave Radiation products of FY-3A and FY-3C, the OLR's ambient field is constructed, and the anomaly index and departure of Qiangtang, Bayanhar and Qaidam blocks before and after Yushu MS7.1 and Jiuzhaigou M7.0 earthquakes are calculated to obtain the anomaly information. The results show that:①OLR increases before Yushu and Jiuzhaigou earthquakes.②By calculating the anomaly indexes of the blocks of Bayanhar, Qaidam and Qiangtang, it's found that before the Yushu earthquake, the maximum anomaly indexes of the blocks of Qiangtang and Bayanhar were 4.2 times and 3.5 times of the standard deviation, respectively, then the earthquake occurred after the anomaly index's decrease; before the Jiuzhaigou earthquake, the anomaly indexes of the blocks of Qiangtang, Bayan Kala and Qaidam were more than 2.6, 2.78 and 1.1 times of the standard deviation, respectively. After the anomaly index drops, the earthquake occurs. ③Before the two earthquakes, there are anomalies in anomaly index and departure. The variation of them may be related to stress's accumulation and unloading between and within blocks, which also shows that OLR has the ability to record regional anomalies before earthquakes.

引言
1 构造背景及研究数据与方法
2 数据对比分析
3 长波辐射异常与异常指数结果分析
4 结论与讨论

图1 玉树、九寨沟地震震中示意图<br/>Fig.1 Map showing the epicenters of the Yushu and the Jiuzhaigou earthquakes

图1 玉树、九寨沟地震震中示意图
Fig.1 Map showing the epicenters of the Yushu and the Jiuzhaigou earthquakes

图2 2015年FY-3A与FY-3C相关系数(a)及2016年1月中旬期散点图(b)<br/>Fig.2 The correlation coefficient between FY-3A and FY-3C(a)and the scatter diagram of the middle period of ten days in January 2016(b)

图2 2015年FY-3A与FY-3C相关系数(a)及2016年1月中旬期散点图(b)
Fig.2 The correlation coefficient between FY-3A and FY-3C(a)and the scatter diagram of the middle period of ten days in January 2016(b)

图3 2016年4月下旬FY-3A(a)与FY-3C(b)的OLR值空间分布及二者之差(c)<br/>Fig.3 The spatial distribution of OLR of FY-3A(a)and FY-3C(b) in the last ten days of April 2016 and their difference(c)

图3 2016年4月下旬FY-3A(a)与FY-3C(b)的OLR值空间分布及二者之差(c)
Fig.3 The spatial distribution of OLR of FY-3A(a)and FY-3C(b) in the last ten days of April 2016 and their difference(c)

图4 2010年1月中旬—5月上旬研究区OLR值距平图<br/>Fig.4 Anomaly of OLR from the middle ten days of January to the first ten days of May 2016

图4 2010年1月中旬—5月上旬研究区OLR值距平图
Fig.4 Anomaly of OLR from the middle ten days of January to the first ten days of May 2016

图5 玉树地震前后不同块体异常指数的时间曲线<br/>Fig.5 Time curve of anomaly index of different blocks before the Yushu earthquake

图5 玉树地震前后不同块体异常指数的时间曲线
Fig.5 Time curve of anomaly index of different blocks before the Yushu earthquake

图6 2017年6月中旬—9月上旬研究区OLR值距平图<br/>Fig.6 Anomaly of OLR from the middle ten days of June to the first ten days of September 2017

图6 2017年6月中旬—9月上旬研究区OLR值距平图
Fig.6 Anomaly of OLR from the middle ten days of June to the first ten days of September 2017

图7 九寨沟地震前后不同块体异常指数的时间曲线<br/>Fig.7 Temporal curve of anomaly index of different blocks before the Jiuzhaigou earthquake

图7 九寨沟地震前后不同块体异常指数的时间曲线
Fig.7 Temporal curve of anomaly index of different blocks before the Jiuzhaigou earthquake

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备注

引言

1 构造背景及研究数据与方法

2 数据对比分析

3 长波辐射异常与异常指数结果分析

4 结论与讨论

期刊信息