STRAIN CHARACTERISTICS OF WFSD STRESS STATIONS AND ITS CO-SEISMIC EFFECTS ANALYSIS: A CASE STUDY UPON MW 9.0 EARTHQUAKE IN JAPAN
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摘要: 2011年3月11日在日本东北部海域发生MW 9.0级强烈地震，汶川地震断裂带科学钻探(WFSD)项目设在陕西汉中地区的体应变仪记录到了完整的应变数据。通过采集数据的分析，探讨了日本MW 9.0级特大地震发生时的同震变化以及地震前后固体潮异常变化过程，分析了地震孕育、发生过程中应变固体潮的趋势性异常及畸变等各种异常现象，并针对这些应变异常进行分析，以期成果能为中国未来地震趋势的预测研究有所帮助。
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关键词:
- 日本MW 9.0级特大地震 /
- WFSD /
- 体应变观测 /
- 应变特征 /
- 同震效应
Abstract: The MW 9.0 earthquake occurred in the northeastern Sea of Japan, on March 11, 2011.The volume strain meter in Wenchuan earthquake Fault Scientific Drilling (WFSD) recorded a complete response waveform at Hanzhong Prefecture, Shaanxi Province.By analyzing acquired data, some issues are studied and discussed by authors that including co-seismic changes of the whole process of MW 9.0 mega-earthquake in Japan, the abnormal strain changes of solid tide prior to that earthquake and after, and the emerging process of that earthquake.Per this paper, the strain anomalies of the MW 9.0 earthquake in Japan are analyzed in order to contribute to better forecast earthquake trends in China the future. -
图 1 日本MW 9.0级地震前震、主震及余震的时空分布
(据日本气象厅)
Figure 1. Temporal and spatial distribution of foreshocks, main shock and aftershocks of MW 9.0 earthquake in Japan
图 2 板块边界与GPS测得的板块运动示意图
(据日本东京大学地震研究所)
Figure 2. Plate boundary and measured plate movement by GPS
图 5 体应变仪原始数据应变固体潮与体应变信号分离
Figure 5. Separation of tidal strain and volume strain signal among the raw data of volume strain meter
图 6 代家坝地应力台站2011年3月份地震发生震级—频度与体积应变固体潮关系
(震级—频度资料来源于日本气象厅)
Figure 6. Magnitude-frequency relation of the volumetric strain and solid tide of the recorded earthquakes by Daijiaba stress station, from January to March, 2011
图 7 代家坝地应力监测台站记录到日本MW 9.0级特大地震的同震应变
(2011年3月11日至12日)
Figure 7. Co-seismic strain of the recorded MW 9.0 earthquake in Japan by Daijiaba stress stations (2011. 3. 11- 12)
图 8 代家坝地应力监测台站记录到日本MW 9.0级特大地震的同震应变
(除去固体潮)
Figure 8. Co-seismic strain of the recorded MW 9.0 earthquake in Japan by Daijiaba stress stations
(Remove the tidal)
图 9 日本MW 9.0级地震引起了2011年3月12 ~ 14日固体潮异常
Figure 9. The caused tidal anomalies by MW 9.0 magnitude earthquake in Japan, on March 9 ~ 19, 2011
图 10 2011年3月9日MW 7. 3级地震是MW 9.0级特大地震的前震同震应变
Figure 10. Co-seismic strain of the MW7. 3 foreshock of the MW 9.0 main earthquake on March 9, 2011
图 11 北京地下室气泡式倾斜仪记录到2011年3月9日日本MW 7. 3级余震同震倾斜曲线
Figure 11. Tilt curve of the recorded MW7. 3 aftershock of Japan by the bubble tiltmeter at basement in Beijing on March 9, 2011
图 12 日本本州东海岸MW 9.0级地震引发的长时间自由振荡现象
(2011年3月12日)
Figure 12. The triggered long time free oscillation by MW 9.0 earthquake at the east coast of Honshu, Japan on March 12, 2011
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