国家自然科学基金项目(41674106,41541034))
感谢中国地震局监测预报处对本工作的大力支持. 感谢中国地震局地球物理研究所“国家数字测震台网数据备份中心”和四川省地震局提供了近震地震波形资料, IRIS为本研究提供了波形数据. 在本文完成过程中, 主编、编委和审稿人提出建设性的修改意见, 特此感谢. 本文图件均用GMT软件绘制.
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图1
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图6
序号 | 深度范围(km) | P波波速(km s‒1) | S波波速(km s‒1) | 密度(kg m‒3) | 粘滞系数(Pa s) |
1 | 0~23.3 | 6.1 | 3.55 | 2740 | ∞ |
2 | 23.3~44 | 6.3 | 3.65 | 2780 | 5×1017 |
3 | 44~53 | 7.0 | 3.99 | 2950 | 5×1017 |
4 | >53 | 8.05 | 4.47 | 3320 | 1×1020 |
深度(km) | 时刻 | | | | | |
6 | 同震 | 0.018 | 0.016 | 0.015 | 0.013 | 0.011 |
同震+震后 | 0.052 | 0.045 | 0.038 | 0.031 | 0.024 | |
20 | 同震 | 0.017 | 0.015 | 0.014 | 0.012 | 0.011 |
同震+震后 | 0.047 | 0.041 | 0.035 | 0.029 | 0.023 |
| | |
1×1017 | 0.059 | 0.058 |
5×1017 | 0.042 | 0.038 |
1×1018 | 0.037 | 0.034 |
1×1019 | 0.024 | 0.022 |
断层名称 | 走向(°) | 倾角(°) | 滑动角(°) | 滑动速率(mm/yr) | 有效摩擦系数 |
岷江 | 180 | 45~56 | 45 | < 1 | 0.6~0.8 |
虎牙 | 150 | 75 | 45 | 1.4 | 0.6~0.8 |
玛曲-荷叶* | 100~145 | 89 | 0 | 1.4~3.2 | 0.6~0.8 |
哈南-青山湾 | 69 | 70 | ‒45 | ‒ | 0.1~0.8 |
迭部-白龙江 | 290 | 68~85 | 45 | ‒ | 0.1~0.8 |
龙日坝 | 205~229 | 60 | 135 | 5.1 ± 1.2 | 0.4~0.6 |
青川 | 70 | 75 | ‒170 | ‒ | 0.6~0.8 |
礼县-罗家堡 | 65 | 65 | 45 | 0.95 | 0.6~0.8 |
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