三维细地结构成像和博海海的结构特征
Yong Ma1, Lei Gao2, Demiao Dong3
1Tianjin Earthquake Agency, Tianjin, 300201, China. marvin.228@163.com.
Scientific reports
|January 9, 2024
概括
这项研究揭示了博海海域独特的地震速度结构,将深层地的模式与断层活动和地震分布联系起来. 地幔物质的迁移是由高Vp/Vs比率表示的.
科学领域:
- 地质物理学 地质物理学
- 地震学 地震学
- 构造学 构造学 构造学 构造学
背景情况:
- 博海海域表现出复杂的构造活动.
- 了解地结构对于地震危险评估至关重要.
研究的目的:
- 在60公里深度以上创建3D地震速度模型 (Vp,Vs,Vp/Vs).
- 为了精确地将波海海域的地震重新定位.
- 为了研究深层地结构和断层活动之间的关系.
主要方法:
- 一致性约束双差异断层扫描. 一致性约束双差异断层扫描.
- 地震波速度的3D反转 (P波和S波).
- 地震搬迁分析. 地震搬迁分析.
主要成果:
- 非常相似的P波和S波速度结构具有显著的横向变化.
- 在坦卢断层下面的分层地具有中层地速度过渡.
- 复杂的张断层结构,具有高速物体和下层地的低速度区域.
- 张断层附近的地震度,与速度结构相关.
- 波海海峡的南北地的差异以及地上至中间地速度异常.
- 高Vp/Vs比表明地物质在地底部迁移.
结论:
- 深层地结构影响了张和坦卢断层的活动.
- 地震速度结构与转移的地震分布有很好的相关性.
- 在波海海的地底部出现地幔物质上升的证据.
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