从与卡斯卡迪亚地震破裂细分相关的深度地震成像中获得的起板块结构和巨型冲击形态
Suzanne M Carbotte1, Brian Boston2, Shuoshuo Han3
1Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY 10964, USA.
Science advances
|June 7, 2024
概括
俯冲区巨型冲击破裂细分与卡斯卡迪亚边缘相关.
科学领域:
- 地质物理学 地质物理学
- 构造学 构造学 构造学 构造学
- 地震学 地震学
背景情况:
- 潜伏区的巨大冲击破裂细分的起源是不太了解的.
- 破裂细分和俯冲区结构演变之间的联系需要进一步调查.
研究的目的:
- 用区域地震成像来描述卡斯卡迪亚边缘沿线的巨大冲击.
- 为了识别下层板块几何和沉积物下推的离散域.
- 为了研究结构域和古破裂细分之间的关系.
主要方法:
- 卡斯卡迪亚边缘区域范围的地震成像.
- 对整个地震带的巨大冲击结构的分析.
- 识别下板几何和沉积物下推领域.
主要成果:
- 确定了下板几何和沉积物下推的离散域,以前没有明显.
- 观察到这些域与上层板块石质/结构和古破裂斑块的对齐.
- 在下板标记不同几何区域之间的边界时发现了冲击滑动断层,可能与上板结构有关.
- 在地震带内记录了胡安·德·福卡板块的碎片.
结论:
- 卡斯卡迪亚潜伏区内的结构域与古破裂细分相关.
- 胡安·德·福卡板块的碎片化及其在异质上层板块下的曲产生了这些结构域.
- 下板的斜俯冲和相关的冲击滑动断层可能会影响大推力细分.
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