在印度尼西亚使用PGD缩放法从区域高速GNSS数据进行地震幅度的稳健估计
Thomas Hardy1,2, Irwan Meilano1, Hasanuddin Z Abidin1
1Geodesy and Geomatics Engineering, Faculty of Earth Science and Technology, Institut Teknologi Bandung (ITB), Bandung 40132, Indonesia.
Sensors (Basel, Switzerland)
|July 12, 2025
概括
这项研究引入了一种使用高速率GNSS数据估计地震强度的新方法,克服了传统地震方法的局限性,以便在印度尼西亚提供更好的海预警.
科学领域:
- 地质物理学 地质物理学
- 地震学 地震学
- 海预警系统的使用.
背景情况:
- 准确的地震强度估计对于有效的海预警至关重要.
- 传统的地震方法面临大事件 (Mw>7.5) 的和度,导致低估.
- 印度尼西亚的地震活动需要改进海准备的大小估计.
研究的目的:
- 使用高速GNSS (HR-GNSS) 数据开发一个区域峰值地面位移 (PGD) 缩放规律.
- 为了提高地震强度估计的准确性和及时性,在印度尼西亚进行海预警.
- 为了解决传统的地震方法在估计大地震的大小方面的局限性.
主要方法:
- 利用了来自印度尼西亚21次中等到大地震的HR-GNSS数据.
- 开发了一个基于87个PGD观测的回归模型,涉及PGD,下心距离和瞬间大小 (Mw).
- 将PGD衍生的大小 (MPGD) 与目录时刻大小进行比较.
主要成果:
- PGD缩放定律与目录瞬间大小 (MAD为0.21) 有着很强的一致性.
- 据MPGD估计,其准确性高于之前公布的全球模型.
- 追溯分析表明,MPGD估计在2-3分钟内趋于一致,并且在大型和海性事件中保持稳定.
结论:
- HR-GNSS数据为快速大小估计提供了传统地震网络的宝贵补充.
- 开发的PGD缩放法提供了可靠的大小估计,对于印度尼西亚的海预警至关重要.
- 这种方法提高了快速评估地震大小的能力,从而提高了海预警的有效性.
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